-By V Gouthaman INTRODUCTION PHP Hypertext Preprocessor

-By V. Gouthaman

INTRODUCTION PHP: Hypertext Preprocessor is a widely used, generalpurpose scripting language that was originally designed for web development to produce dynamic web pages. For this purpose, PHP code is embedded into the HTML source document and interpreted by a web server with a PHP processor module, which generates the web page document. As a generalpurpose programming language, PHP code is processed by an interpreter application in commandline mode performing desired operating system operations and producing program output on its standard output channel.

It may also function as a graphical application. PHP is available as a processor for most modern web servers and as standalone interpreter on most operating systems and computing platforms. PHP was originally created by Rasmus Lerdorf in 1995 and has been in continuous development ever since. The main implementation of PHP is now produced by The PHP Group and serves as the de facto standard for PHP as there is no formal specification. PHP is free software released under the PHP License.

INSTALLATION AND CONFIGURATION

Step 1: Download the latest Windows PHP Binaries (MSI file) from “http: //www. php. net/get/php-5. 2. 4 -win 32 installer. msi/from/a/mirror”. I choose the e. ZNetworking mirror because it is the closest one to Malaysia. Choose a mirror that is nearer to your country for a faster file download. The latest PHP version that I downloaded is 5. 2. 4. Save the file to your Desktop. Step 2: Right click on the file and click “Install“.

Step 3: Click “Next ” once the Welcome page is displayed.

Step 4: Select “I accept the license agreement” and click “Next “.

Step 5: Change your PHP installation path OR just accept the default path - C: Program FilesPHP and click “Next “.

Step 6: On the Web Server Setup screen, select the Apache 2. 2. x Module and click “Next “. select-webserver-to-install-php-on-apache-2

Step 7: On the Apache Configuration Directory screen, browse for the Apache configuration directory (conf) OR just enter C: Program FilesApache Software FoundationApache 2. 2conf and click “Next ” to proceed with the installation.

Step 8: For now, accept the default selection and click “Next”.

Step 9: Click “Install ” to install PHP 5 on Windows.

Step 10: Click “Finish ” once completed. PHP 5 is successfully installed.

Step 11: Start your Apache 2. 2 server using the “Monitor Apache Servers” console (Start -> Apache HTTP Servers 2. 2. 4 -> Monitor Apache Servers ). You can see that PHP was successfully installed by checking the Apache status at the bottom of the console.

Testing PHP 5 Installation Step 1: Open up your Windows Notepad. Type in “<? phpinfo(); ? >” inside the file. Save this file as “info. php” inside your Apache root directory, C: Program FilesApache Software FoundationApache 2. 2htdocs.

Step 2: Open up your web browser. In the address bar, type in your web server domain name plus info. php as the file name. Example: http: //www. syahid. com/info. php. You should get a PHP configuration page just like the one below. Congratulations! You have successfully installed and test PHP 5 on Windows!

CONFIGURATION

Configure PHP 5 to Work with My. SQL PHP Extension Previously, we have installed PHP with minimal modules / extension. To add My. SQL support to PHP, you need to change your PHP installation - by adding the My. SQL extension on top of your PHP installation. Please make sure that your original PHP 5 MSI installer still remains at its original place.

Step 1: Open the Add / Remove Programs console via Windows Control Panel. Find the PHP 5. x. x entry and click “Change “.

Step 2: Click “Next ” once you are prompted the Welcome page.

Step 3: Click the “Change ” button to proceed.

Step 4: Select Apache 2. 2. x as shown in the picture below. Click “Next ” once again.

Step 5: Select your Apache configuration directory (conf) - the directory where your httpd. conf resides. Click “Next ” once done.

Step 6: On the “Choose items to install” screen, click on the plus (+) icon next to Extensions to expand the list. click-plus-button-to-expand-extensions-part

Step 7: Select on the “X” next to “My. SQL” and select “Entire feature will be installed on local hard drive”. Click “Next” again

Step 8: Click the “Change” button to save all the PHP configuration changes.

Step 9: Finally, restart your Apache 2. 2 web server! You can check out that the My. SQL extension support for PHP was successfully installed by checking out the info. php / index. php page that was created before.

PHP SAMPLE PROGRAMS

Sample 1: current date in an HTML pag <html> <head> <title>Example #1 TDavid's Very First PHP Script ever!</title> </head> <? print(Date("l F d, Y")); ? > <body> </html>

2. current month/day/date format <html> <head> <title>Example #3 TDavid's Very First PHP Script ever!</title> </head> <? print(Date("m/j/y")); ? > <body> </html>

3. current month/day/date with HTML colors & formatting <html> <head> <title>PHP Script examples!</title> </head> <font face="Arial" color="#FF 00 FF"><strong><? print(Date("m/j/y")); ? > </strong></font> <body> </html>

4. change background color based on day o the week using if elseif statements <html> <head> <title>Background Colors change based on the day of the week</title> </head> <? $today = date("l"); print("$today"); if($today == "Sunday") { $bgcolor = "#FEF 0 C 5"; }

elseif($today == "Monday") { $bgcolor = "#FFFFFF"; } elseif($today == "Tuesday") { $bgcolor = "#FBFFC 4"; } elseif($today == "Wednesday") { $bgcolor = "#FFE 0 DD"; } elseif($today == "Thursday"){ $bgcolor = "#E 6 EDFF"; }

elseif($today == "Friday") { $bgcolor = "#E 9 FFE 6"; } else { // Since it is not any of the days above it must be Saturday $bgcolor = "#F 0 F 4 F 1"; } print("<body bgcolor="$bgcolor">n"); ? > This just changes the color of the screen based on the day of the week </body> </html>

<html> <head> <title>Background Colors change based on the day of the week</title></head> <? $today = date("w"); $bgcolor = array( "#FEF 0 C 5", "#FFFFFF", "#FBFFC 4", "#FFE 0 DD", "#E 6 EDFF", "#E 9 FFE 6", "#F 0 F 4 F 1" ); ? > <body bgcolor="<? print("$bgcolor[$today]"); ? >"> This just changes the color of the screen based on the day of the week </body> </html>

5. Add date time stamp "page last updated on. . " using filemtime functionusing forms, cookies, flat file databases, random number generation <html> <head> <title>Page last updated on month/date/year hour: min PHP Script</title> </head> <? $last_modified = filemtime("example 7. php 3"); print("Last Modified "); print(date("m/j/y h: i", $last_modified)); ? > </body> </html>

6. Setting and retrieving a cookie <? $check = "test"; $check. = $filename; if ($test == $check) {print("<HTML><BODY>You have already voted. Thank you. </BODY></HTML>"); } else{ $rated = "test"; $rated. = $filename; setcookie(test, $rated, time()+86400); print("<HTML><BODY> You haven't voted before so I recorded your vote</BODY></HTML>"); } ? >

7. Getting an average number using PHP <? $total_ratings = (3+2+3+1+5+2+3); $total_votes = 7; $average = $total_ratings / $total_votes; print("The Average Rating Is: $average"); ? >

8. showing the surfer average vote statistics, usin printf function <? $path = "/YOUR/PATH/TO/public_html/php_diary/data"; $filename = "122499. dat"; $x= -1; if($file = fopen("$path/$filename", "r")) { while(!feof($file)) { $therate = fgetss($file, 255); $x++; $count = $count + $therate; } fclose($file); } $average = ($count / $x); print("Surfer Average Rating for 12/24/99: "); printf("%. 2 f", $average); print(" Total Surfer Votes: $x"); ? >

9. Generating a random number from 0 to 9 <? srand(time()); $random = (rand()%9); print("Random number between 0 and 9 is: $random"); ? >

10. php simple slot machine - multiple random number generation <? function slotnumber() { srand(time()); for ($i=0; $i < 3; $i++) { $random = (rand()%3); $slot[] = $random; } print("<td width="33%"><center>$slot[0]</td>"); print("<td width="33%"><center>$slot[1]</td>"); print("<td width="33%"><center>$slot[2]</td>"); </tr>

11. php simple slot machine - multiple random number generation <tr> <td width="100%" colspan="3" bgcolor="#008080"><form method="POST" action="example 13. php 3"><div align="center"><center><p><input type="submit" value="Spin!"></p> </center></div> </form> </td> </tr> </table> </center></div>

12. random text link advertising using predefine arrays mail, regular expressions, password protection <? $random_url = array("http: //www. tdscripts. com/linkorg. html", "http: //www. tdscripts. com/keno. html", "http: //www. tdscripts. com/ezibill. shtml", "http: //www. tdscripts. com/tdforum. shtml", "http: //www. tdscripts. com/picofday. html", "http: //www. tdscripts. com/gutsorglory. html");

$url_title = array("Link Organizer", "TD Keno", "ezi. Bill *Free Promotion!", "TD Forum", "TD Pic of Day PHP", "Guts or Glory Poker PHP"); $url_desc = array("- A comprehensive link list organizer", "- Offer your site visitors an engaging Keno game without the monetary risk", "- Sell access to and protect your membership area using i. Bill and our ezi. Bill script", "- An unthreaded messageboard script to exchange ideas with your site visitors", "- Run your own picture of the day script from any site anywhere with this handy script", "- A casino-style card game written entirely in PHP");

srand(time()); $sizeof = count($random_url); $random = (rand()%$sizeof); print("<center><a href="$random_url[$random]">$url_title[$rando m]</a> $url_desc[$random]</center>"); ? >

13. forcing the text in a string to be all upp or lowercase <? // force all uppercase print(strtoupper("i bet this will show up as all letters capitalized ")); // force all lowercase print(strtolower("I BET THIS WILL SHOW UP AS ALL LETTERS IN LOWERCASE ")); // force the first letter of a string to be capitalized print(ucfirst("i bet this will show the first letter of the string capitalized ")); // force the first letter of each WORD in a string to be capitalized print(ucwords("i bet this will show the first letter of every word capitalized ")); ? >

14. searching through meta tags for a search engine <HTML> <BODY> <? $all_meta = get_meta_tags("010600. php 3"); print($all_meta["description"]); print(" "); print($all_meta["keywords"]); ? > </BODY> </HTML>

15. searching through a directory and picking out files using a regular expression <? $diary_directory = opendir(". "); while($filename = readdir($diary_directory)) { $filesplit = explode(". ", $filename); $check_filename = $filesplit[0]; if(ereg("[0 -9]{6}", $check_filename)) { $check_filename. = ". $filesplit[1]"; $valid_filename[] = $check_filename; } } closedir($diary_directory); for($index = 0; $index < count($valid_filename); $index++) { print("$valid_filename[$index] "); } ? >

16. shuffling and "cutting" a deck of playing cards <? $cards = array("ah", "ac", "ad", "as", "2 h", "2 c", "2 d", "2 s", "3 h", "3 c", "3 d", "3 s", "4 h", "4 c", "4 d", "4 s", "5 h", "5 c", "5 d", "5 s", "6 h", "6 c", "6 d", "6 s", "7 h", "7 c", "7 d", "7 s", "8 h", "8 c", "8 d", "8 s", "9 h", "9 c", "9 d", "9 s", "th", "tc", "td", "ts", "jh", "jc", "jd", "js", "qh", "qc", "qd", "qs", "kh", "kc", "kd", "ks");

srand(time()); for($i = 0; $i < 52; $i++) { $count = count($cards); $random = (rand()%$count); if($cards[$random] == "") { $i--; } else { $deck[] = $cards[$random]; $cards[$random] = ""; } }

srand(time()); $starting_point = (rand()%51); print("Starting point for cut cards is: $starting_point<p>"); // display shuffled cards (EXAMPLE ONLY) for ($index = 0; $index < 52; $index++) { if ($starting_point == 52) { $starting_point = 0; } print("Uncut Point: <strong>$deck[$index]</strong> "); print("Starting Point: <strong>$deck[$starting_point]</strong> "); $starting_point++; } ? >

17. Reader rated most useful diary entries i descending order <HTML> <HEAD> <title>Reader Rated Most Useful Entries</title> </HEAD> <BODY> <table border="0" width="100%"> <tr> <td width="6%" bgcolor="#00 FFFF"><p align="center"><small><font face="Verdana">Rank</font></small></td> <td width="7%" bgcolor="#00 FFFF"><p align="center"><small><font face="Verdana">Rating</font></small></td>

<td width="11%" bgcolor="#00 FFFF"><p align="center"><small><font face="Verdana">Diary Date</font></small></td> <td width="76%" bgcolor="#00 FFFF"><p align="left"><small><font face="Verdana">Description of Diary Page</font></small> </td> <script language="php"> $db = "DATABASE NAME"; $admin = "MYSQL USER NAME"; $adpass = "MYSQL PASSWORD"; $mysql_link = mysql_connect("localhost", $admin, $adpass); mysql_select_db($db, $mysql_link);

$query = "SELECT * FROM avg_tally ORDER BY average DESC"; $result = mysql_query($query, $mysql_link); if(mysql_num_rows($result)) { $rank = 1; while($row = mysql_fetch_row($result)) { print("</tr><tr>"); if($color == "#D 8 DBFE") { $color = "#A 6 ACFD"; } else { $color = "#D 8 DBFE"; } print("<td width="6%" bgcolor="$color"><center><small>"); print("<font face="Verdana">$rank</font></small></center></td>"); print("<td width="7%" bgcolor="$color"><center><small>"); print("<font face="Verdana"><strong>$row[1]</strong></font></small></center></td>"); print("<td width="11%" bgcolor="$color"><center><small>"); $url = $row[2]. ". php 3";

$if(!file_exists($url)) { $url = $row[2]. ". html"; } print("<font face="Verdana"><a href="$url">$row[2]</a></font></small></center></t d>"); print("<td width="76%"$

if(!file_exists($url)) { $url = $row[2]. ". html"; } print("<font face="Verdana"><a href="$url">$row[2]</a></font></small></center></t d>"); print("<td width="76%" bgcolor="$color"><left><small>"); print("<font face="Verdana">$row[3]</font></small></left></td>") ; $rank++; } } </script> </table> </BODY> </HTML>

18. creating a my. SQL table using a PHP script <? $mysql_db = "DATABASE NAME"; $mysql_user = "YOUR MYSQL USERNAME"; $mysql_pass = "YOUR MYSQL PASSWORD"; $mysql_link = mysql_connect("localhost", $mysql_user, $mysql_pass); mysql_select_db($mysql_db, $mysql_link); $create_query = "CREATE TABLE tds_counter ( COUNT_ID INT NOT NULL AUTO_INCREMENT, pagepath VARCHAR(250), impressions INT, reset_counter DATETIME, PRIMARY KEY (COUNT_ID) )";

19. creating a my. SQL table using a PHP script mysql_query($create_query, $mysql_link); print("Table Creation for <b>tds_counter</b> successful!<p>"); $insert = "INSERT into tds_counter VALUES ( 0, '/php_diary/021901. php 3', 0, SYSDATE() )"; mysql_query($insert, $mysql_link); print("Inserted new counter successfully for this page: http: //www. phpscripts. com/php_diary/021901. php 3<p>"); ? >

20. my. SQL based counter script for multiple pages. Automating manual tasks, date sorting, mktime() <? $db = "DATABASE NAME"; $admin = "MYSQL USER NAME"; $adpass = "MYSQL PASSWORD"; $mysql_link = mysql_connect("localhost", $admin, $adpass); mysql_select_db($db, $mysql_link); $result = mysql_query("SELECT impressions from tds_counter where COUNT_ID='$cid'", $mysql_link); if(mysql_num_rows($result)) { mysql_query("UPDATE tds_counter set impressions=impressions+1 where COUNT_ID='$cid'", $mysql_link); $row = mysql_fetch_row($result); if($inv != 1) { print("$row[0]"); } }? >

21. Classify Email as Bounce (DSN) or Automated Reply <? php $bounce = new COM("Chilkat. Bounce"); $success = $bounce->Unlock. Component('Anything for 30 day trial'); if ($success == false) { print 'Failed to unlock component'. "n"; exit; } $email = new COM("Chilkat. Email");

// Load an email from a. eml file. // (This example loads an Email object from a. eml file, // but the object could have been read // directly from a POP 3 or IMAP mail server using // Chilkat's POP 3 or IMAP implementations. ) $success = $email>Load. Eml('sample. Bounce. eml'); if ($success == false) { print $email->last. Error. Text(). "n"; exit; }

$success = $bounce->Examine. Mail($email); if ($success == false) { print $bounce->last. Error. Text(). "n"; exit; } if ($bounce->Bounce. Type == 1) { // Hard bounce, log the email address print 'Hard Bounce: '. $bounce->bounce. Address(). "n"; } if ($bounce->Bounce. Type == 2) { // Soft bounce, log the email address print 'Soft Bounce: '. $bounce->bounce. Address(). "n"; }

if ($bounce->Bounce. Type == 3) { // General bounce, no email address available. print 'General Bounce: No email address'. "n"; } if ($bounce->Bounce. Type == 4) { // General bounce, log the email address print 'General Bounce: '. $bounce>bounce. Address(). "n"; } if ($bounce->Bounce. Type == 5) { // Mail blocked, log the email address print 'Mail Blocked: '. $bounce>bounce. Address(). "n"; }

if ($bounce->Bounce. Type == 6) { // Auto-reply, log the email address print 'Auto-Reply: '. $bounce->bounce. Address(). "n"; } if ($bounce->Bounce. Type == 7) { // Transient (recoverable) Failure, log the email address print 'Transient Failure: '. $bounce->bounce. Address(). "n"; } if ($bounce->Bounce. Type == 8) { // Subscribe request, log the email address print 'Subscribe Request: '. $bounce->bounce. Address(). "n"; } if ($bounce->Bounce. Type == 9) { // Unsubscribe Request, log the email address print 'Unsubscribe Request: '. $bounce->bounce. Address(). "n"; }

if ($bounce->Bounce. Type == 10) { // Virus Notification, log the email address print 'Virus Notification: '. $bounce->bounce. Address(). "n"; } if ($bounce->Bounce. Type == 11) { // Suspected bounce. // This should be rare. It indicates that the Bounce // component found strong evidence that this is a bounced // email, but couldn//t quite recognize everything it // needed to be 100% sure. Feel free to notify // support@chilkatsoft. com regarding emails having this // bounce type. print 'Suspected Bounce!'. "n"; } ? >

22. Program to print a message <html> <h 3>My first PHP Program</h 3> <? echo "Hello world!"; ? > </html>

23. PHP Array <? php $employee_names[0] = "Dana"; $employee_names[1] = "Matt"; $employee_names[2] = "Susan"; echo "The first employee's name is ". $employee_names[0]; echo " "; echo "The second employee's name is ". $employee_names[1]; echo " "; echo "The third employee's name is ". $employee_names[2]; ? >

24. File Upload Script <html> <head> <title>A File Upload Script</title> </head> <body> <div> <? php if ( isset( $_FILES['fupload'] ) ) { print "name: ". $_FILES['fupload']['name']. " "; print "size: ". $_FILES['fupload']['size']. " bytes "; print "temp name: ". $_FILES['fupload']['tmp_name']. " "; print "type: ". $_FILES['fupload']['type']. " "; print "error: ". $_FILES['fupload']['error']. " "; if ( $_FILES['fupload']['type'] == "image/gif" ) { $source = $_FILES['fupload']['tmp_name']; $target = "upload/". $_FILES['fupload']['name'];

move_uploaded_file( $source, $target ); // or die ("Couldn't copy"); $size = get. Image. Size( $target ); $imgstr = "<p><img width="$size[0]" height="$size[1]" "; $imgstr. = "src="$target" alt="uploaded image" /></p>"; print $imgstr; } } ? > </div> <form enctype="multipart/form-data" action="<? php print $_SERVER['PHP_SELF']? >" method="post"> <p> <input type="hidden" name="MAX_FILE_SIZE" value="102400" /> <input type="file" name="fupload" /><br/> <input type="submit" value="upload!" /> </p> </form> </body> </html>

25. Simple File Upload Form <html> <head> <title>A Simple File Upload Form</title> </head> <body> <form enctype="multipart/form-data" action="<? print $_SERVER['PHP_SELF']? >" method="post"> <p> <input type="hidden" name="MAX_FILE_SIZE" value="102400" /> <input type="file" name="fupload" /><br/> <input type="submit" value="upload!" /> </p> </form> </body> </html>

26. Creating an HTML Form That Accepts Mail-Related Information <html> <head> <title>Simple Send Mail Form</title> </head><body> <h 1>Mail Form</h 1> <form name="form 1" method="post" action="Simple. Email. php"> <table> <tr><td><b>To</b></td><input type="text" name="mailto" size="35"></td></tr> <tr><td><b>Subject</b></td> <td><input type="text" name="mailsubject" size="35"></td></tr> <tr><td><b>Message</b></td> <td><textarea name="mailbody" cols="50" rows="7"></textarea></td> </tr> <tr><td colspan="2"> <input type="submit" name="Submit" value="Send"> </td></tr></table></form></body> </html>

<!-- Simple. Email. php <? php if (empty ($mailto) ) { die ( "Recipient is blank! ") ; } if (empty ($mailsubject) ){ $mailsubject=" " ; } if (empty ($mailbody) ) { $mailbody=" " ; } $result = mail ($mailto, $mailsubject, $mailbody) ; if ($result) { echo "Email sent successfully!" ; }else{ echo "Email could not be sent. " ; } ? >

27. React to Form action <HTML> <BODY> <FORM METHOD="POST" ACTION="Get. Form. Value. php"> <H 2>Contact List</H 2> <BR>Nickname: <BR><INPUT TYPE="TEXT" NAME="Nickname"> <BR>Full Name: <BR><INPUT TYPE="TEXT" NAME="Fullname">

<BR>Memo: <BR><TEXTAREA NAME="Memo" ROWS="4" COLS="40" WRAP="PHYSICAL"> </TEXTAREA> <BR> <INPUT TYPE="SUBMIT"> </FORM> </BODY> <!-- Get. Form. Value. php <? php echo "<BR>Nickname=$Nickname"; echo "<BR>Fullname=$Fullname"; echo "<BR>Memo=$Memo"; ? >

$28. Build query string based on form inp <? php if (isset($_POST['submit'])) { $row.$

28. Build query string based on form inp <? php if (isset($_POST['submit'])) { $row. ID = $_POST['id']; mysql_connect("mysql 153. secureserver. net", "java 2 s", "passwo d"); mysql_select_db("java 2 s"); $query = "SELECT * FROM Employee WHERE ID='$id'"; $result = mysql_query($query); list($name, $productid, $price, $description) = mysql_fetch_row($result); }

? > <form action="<? php echo $_SERVER['PHP_SELF']; ? >" method="post"> <select name="id"> <option name="">Choose a employee: </option> <option name="1">1</option> <option name="2">2</option> <option name="3">3</option> </select> <input type="submit" name="submit" value="Submit" /> </form>

29. Checking input from a checkbox or a multiple select <? php $options = array('option 1', 'option 2', 'option 3'); $valid = true; if (is_array($_GET['input'])) { $valid = true; foreach($_GET['input'] as $input) { if (!in_array($input, $options)) { $valid = false; } } if ($valid) { //process input } } ? >

30. Validating a single checkbox <? php $value = 'yes'; echo "<input type='checkbox' name='subscribe' value='yes'/> Subscribe? "; if (isset($_POST['subscribe'])) { if ($_POST['subscribe'] == $value) { $subscribed = true; } else { $subscribed = false;

print 'Invalid checkbox value submitted. '; } } else { $subscribed = false; } if ($subscribed) { print 'You are subscribed. '; } else { print 'You are not subscribed'; }

31. Deal with Array Form Data <HTML> <BODY> <FORM METHOD="POST" ACTION="Deal. With. Array. Form. Data. php"> <H 1>Contact Information</H 1> <TABLE><TR> <TD>Childrens' Names: </TD> </TR> <TR> <TD><INPUT TYPE="TEXT" NAME="children[]"></TD> </TR>

$32. A process_form() Function <? php function process_form($data) { $msg = "The form at$

32. A process_form() Function <? php function process_form($data) { $msg = "The form at {$_SERVER['PHP_SELF']} was submitted with these values: nn"; foreach($data as $key=>$val) { $msg. = "$key => $valn"; } mail("joeuser@somewhere. com", "form submission", $msg); } ? >

33. Access widget's form value <INPUT TYPE="text" NAME="myform. email"> would be accessed in PHP as the following: <? php echo $_GET['myform_email']; ? >

34. Accessing multiple submitted value <form method="POST" action="index. php"> <select name="lunch[]" multiple> <option value="a">A</option> <option value="b">B</option> <option value="c">C</option> <option value="d">D</option> <option value="e">E</option> </select> <input type="submit" name="submit"> </form> Selected buns: <br/><? php foreach ($_POST['lunch'] as $choice) { print "You want a $choice bun. <br/>"; } ? >

35. Forms and PHP //index. htm <html> <body> <form action="index. php" method="post"> Your Name: <input type="text" name="name" size="20" maxlength="20" value=""> Your Email: <input type="text" name="email" size="20" maxlength="40" value=""> <input type="submit" value="go!"> </form> </body> </html>

//index. php <html> <head> <title></title> </head> <body> <? print "Hi, $name!. Your email address is $email"; ? > </body> </html>

$36. Handling Special Characters <html> <body> <? php if ($_POST['submitted'] == "yes"){ $yourname =$

36. Handling Special Characters <html> <body> <? php if ($_POST['submitted'] == "yes"){ $yourname = $_POST['yourname']; $yourname = trim ($yourname); $yourname = strip_tags ($yourname); $yourname = htmlspecialchars ($yourname); $yourname = addslashes ($yourname); echo $yourname. " "; ? ><a href="index. php">Try Again</a><? php }

$if ($_POST['submitted'] != "yes"){ ? > <form action="index. php" method="post"> <p>Example: </p> <input type="hidden"$

if ($_POST['submitted'] != "yes"){ ? > <form action="index. php" method="post"> <p>Example: </p> <input type="hidden" name="submitted" value="yes" /> Your Name: <input type="text" name="yourname" maxlength="150" /> <input type="submit" value="Submit" style="margintop: 10 px; " /> </form> <? php } ? > </div> </body> </html>

$37. Saying "Hello" <? if (array_key_exists('my_name', $_POST)) { print "Hello, ". $_POST['my_name']; } else$

37. Saying "Hello" <? if (array_key_exists('my_name', $_POST)) { print "Hello, ". $_POST['my_name']; } else { print<<<_HTML_ <form method="post" action="$_SERVER[PHP_SELF]"> Your name: <input type="text" name="my_name"> <br/> <input type="submit" value="Say Hello"> </form> _HTML_; } ? >

38. An HTML Form That Calls Itself <html> <head> <title>An HTML Form that Calls Itself</title> </head><body> <div> <? php if ( ! empty( $_POST['guess'] ) ) { print "last guess: ". $_POST['guess']; }? > <form method="post" action="<? php print $_SERVER['PHP_SELF']? >"> <p> Type your guess here: <input type="text" name="guess" /> </p></form></div> </body> </html>

$39. Form submitting <? php if (isset($_POST['submit'])){ echo "Hi ". $_POST['name']. "! "; echo$

39. Form submitting <? php if (isset($_POST['submit'])){ echo "Hi ". $_POST['name']. "! "; echo "The address ". $_POST['email']. " will soon be a spam-magnet! "; } ? > <form action="index. php" method="post"> Name: <input type="text" name="name" size="20" maxlength="40" value="" /> Email Address: <input type="text" name="email" size="20" maxlength="40" value="" /> <input type="submit" name = "submit" value="Go!" /> </form>

40. One-script form processing //File: index. php <html> <head> <title></title> </head> <body> <? $form = "<form action="index. php" method="post"> <input type="hidden" name="seenform" value="y"> <b>Give us some information!</b> Your Name: <input type="text" name="name" size="20" maxlength="20" value="">

Your Email: <input type="text" name="email" size="20" maxlength="40" value=""> <input type="submit" value="subscribe!"> </form>"; if ($seenform != "y"): print "$form"; else : print "Hi, $name!. Your email address is $email"; endif; ? > </body> </html>

41. Preventing Multiple Submissions on the Client Side <html> <script language="javascript" type="text/javascript"> function checkandsubmit() { document. test. submitbut. disabled = true; document. test. submit(); } </script> <body> <form action="index. php" method="post" name="test" onsubmit="return checkandsubmit ()"> <input type="hidden" name="submitted" value="yes" /> Your Name: <input type="text" name="yourname" maxlength="150" />

42. Preventing Multiple Submissions on the Server Side <html> <body> <form action="index. php" method="post"> <input type="hidden" name="submitted" value="yes" /> Your Name: <input type="text" name="yourname" maxlength="150" /> <input type="submit" value="Submit" style="margin-top: 10 px; " /></form> </body> </html> <? php session_start (); if (! isset ( $_SESSION ['processing'] )) { $_SESSION ['processing'] = false; }

$if ($_SESSION ['processing'] == false) { $_SESSION ['processing'] = true; //validation if ($file =$

if ($_SESSION ['processing'] == false) { $_SESSION ['processing'] = true; //validation if ($file = fopen ( "test. txt", "w+" )) { fwrite ( $file, "Processing" ); } else { echo "Error opening file. "; } echo $_POST ['yourname']; unset ( $_SESSION ['processing'] ); } ? >

$43. Authenticate user: Databased <? php function authenticate_user() { header('WWW-Authenticate: Basic realm="Secret Stash"'); header("HTTP/1.$

43. Authenticate user: Databased <? php function authenticate_user() { header('WWW-Authenticate: Basic realm="Secret Stash"'); header("HTTP/1. 0 401 Unauthorized"); exit; } if (! isset($_SERVER['PHP_AUTH_USER'])) { authenticate_user(); } else { mysql_pconnect("localhost", "authenticator", "secret") or die("Can't connect to database server!"); mysql_select_db("java 2 s") or die("Can't select authentication database!");

$query = "SELECT username, pswd FROM user WHERE username='$_SERVER[PHP_AUTH_USER]' AND pswd=MD 5('$_SERVER[PHP_AUTH_PW]')"; $result = mysql_query($query); // If nothing was found, reprompt the user for the login information. if (mysql_num_rows($result) == 0) { authenticate_user(); } } ? >

44. Prompt Browser password dialog <? php if (($_SERVER['PHP_AUTH_USER'] != 'specialuser') || ($_SERVER['PHP_AUTH_PW'] != 'secretpassword')) { header('WWW-Authenticate: Basic Realm="Secret Stash"'); header('HTTP/1. 0 401 Unauthorized'); print('You must provide the proper credentials!'); exit; } ? >

45. Open browser password dialog and authenticate user based on database <? php function authenticate_user() { header('WWW-Authenticate: Basic realm="Secret Stash"'); header("HTTP/1. 0 401 Unauthorized"); exit; } if(! isset($_SERVER['PHP_AUTH_USER'])) { authenticate_user(); }

$else { mysql_connect("localhost", "authenticator", "secret") or die("Can't connect to database server!"); mysql_select_db("gilmorebook") or die("Can't$

else { mysql_connect("localhost", "authenticator", "secret") or die("Can't connect to database server!"); mysql_select_db("gilmorebook") or die("Can't select authentication database!"); $query = "SELECT username, pswd FROM user WHERE username='$_SERVER[PHP_AUTH_USER]' AND pswd=MD 5('$_SERVER[PHP_AUTH_PW]') AND ip. Address='$_SERVER[REMOTE_ADDR]'"; $result = mysql_query($query); if (mysql_num_rows($result) == 0) authenticate_user(); mysql_close(); }? >

46. Login ID Options <HTML> <HEAD> <TITLE>Displaying Login ID Options</TITLE> </HEAD> <BODY> <Hl><CENTER>Generating Login IDs for Dave</CENTER></Hl> <? php $loginfo = array ( First. Name => "Joe", Last. Name => "Howrod", Sex => "Male", Location => "Arizona", Age => "24", Music. Choice => "Pop", Hobby => "Dance", Occupation => "Author"); echo "<H 3>The information entered by JOe: <BR></H 3>"; foreach ($loginfo as $key => $val) { echo "<B>$key</B> => $val<BR>"; }

echo "<BR> "; echo "<H 3>The login options are: <BR></H 3>"; $loginone = array_slice ($loginfo, 0, 2); $logintwo = array_slice ($loginfo, 3, 2); $loginthree = array_slice ($loginfo, 5, 2); $loginfour = array_slice ($loginfo, 6, 2); $loginfive = array_merge ($loginfour, "2001"); echo "The first login option: <BR>"; foreach ($loginone as $optionone) { echo "<B>$optionone</B>"; } echo "<BR>"; echo "The second login option: <BR>"; foreach ($loginone as $optiontwo) { echo "<B>$optiontwo</B>"; } echo "<BR>";

echo "The third login option: <BR>"; foreach ($loginthree as $optionthree) { echo "<B>$optionthree</B>"; } echo "<BR>"; echo "The fourth login option: <BR>"; foreach ($loginfour as $optionfour) { echo "<B>$optionfour</B>"; } echo "<BR>"; echo "The fifth login option: <BR>"; foreach ($loginfive as $optionfive) { echo "<B>$optionfive</B>"; } echo "<BR>"; ? > </BODY> </HTML>

47. Get uniqid <? $id = uniqid("phpuser"); echo "$id"; ? >

48. Use md 5 function to encrypt text <? php $val = "secret"; echo "Pre-hash string: $val "; $hash_val = md 5 ($val); echo "Hashed outcome: $hash_val"; ? >

49. md 5 and uniqid <? $id = md 5(uniqid(rand())); echo "$id"; ? >

50. A user registration process create table user_info ( user_id char(18), fname char(15), email char(35)); //File: index. php <? $form = " <form action="index. php" method="post"> <input type="hidden" name="seenform" value="y"> Your first name? : <input type="text" name="fname" value=""> Your email? : <input type="text" name="email" value=""> <input type="submit" value="Register!"> </form> ";

if ((! isset ($seenform)) && (! isset ($userid))) : print $form; elseif (isset ($seenform) && (! isset ($userid))) : $uniq_id = uniqid(rand()); @mysql_pconnect("localhost", "root", "") or die("Could not connect to My. SQL server!"); @mysql_select_db("user") or die("Could not select user database!"); $query = "INSERT INTO user_info VALUES('$uniq_id', '$fname', '$email')"; $result = mysql_query($query) or die("Could not insert user information!"); setcookie ("userid", $uniq_id, time()+2592000); print "Congratulations $fname! You are now registered!. ";

elseif (isset($userid)) : @mysql_pconnect("localhost", "root", "") or die("Could not connect to My. SQL server!"); @mysql_select_db("user") or die("Could not select user database!"); $query = "SELECT * FROM user_info WHERE user_id = '$userid'"; $result = mysql_query($query) or die("Could not extract user information!"); $row = mysql_fetch_array($result); print "Hi ". $row["fname"]. ", "; print "Your email address is ". $row["email"]; endif; ? >