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This enables the PHP script (next_pagephp) to know which session the user belongs to and to avoid the use of HTTP cookies If you wish to maintain the session by using this method, all the links in the PHP page have to have the < =SID > tag appended to them; otherwise, the session will not be available on every PHP page
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Ending a session is as simple as creating one For example, the following PHP script will terminate the current user session:
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< php session_start(); $sessionArray=$HTTP_SESSION_VARS; session_destroy(); foreach ($sessionArray as $session_name => $session_value) { unset($$session_name); } unset($sessionArray); >
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Here the session_start() is needed to connect the script page to the current session Then $sessionArray is assigned the session variables stored in global variable $HTTP_SESSION_VARS The session_destroy() function is called to remove session data from the server The foreach loop explicitly unsets each session variable Finally, the $sessionArray variable is also unset to completely remove the session
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By default, session data are stored in files (because sessionsave_handler = files in phpini) and also by default the data is stored in session files (prefix sess_identifier) in the /tmp directory If you wish to change the session file directory, set the sessionsave_path directive in phpini to point to a different directory Make sure session files are not readable by anyone other than the Web server user
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PHP works very well with MySQL, Postgres, Oracle, and other popular databases MySQL is the most widely used database platform for PHP If you have not yet installed MySQL on your system, you can learn how to install it at wwwmysqlcom
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To access a MySQL database you need a username and password that MySQL accepts for access to the desired database For example, Listing 15-11 shows a PHP script called simple_queryphp, which accesses a MySQL database called www as user httpd with password no1secret from the local host
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Listing 15-11: simple_queryphp
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< php $host = localhost ; $user = httpd ; $passwd = no1secret ; $database_name = www; $table = users ; $dbh = mysql_connect($host, $user, $passwd); mysql_select_db($database_name, $dbh); > <html> <head><title>Simple Query Script</title></head> <body> <table border=1> <tr><th>Name</th> <th>Password</th></tr> < php $result = mysql_query( SELECT * from $table , $dbh);
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while ($myRow = mysql_fetch_row($result)) { printf( <tr><td>%s</td><td>%s</td></tr> , $myRow[0], $myRow[1]); } > </table> </body> </html>
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Here s what s going on in the above listing: 1 This script defines the $host, $user, $passwd, $database, and $table variables that can be set to the appropriate MySQL server host name, username, password, database name, and table name 2 The script then uses the mysql_connect() function to create a connection to the database server every time the page is requested The connection handle is stored in another variable called $dbh 3 The mysql_select_db() function selects the $database-specified database to use At this point, the $dbh handle is connected to the database server and it operates on the named database 4 The script prints out a regular HTML document, which has another tiny PHP script embedded in it, which performs a SQL query to the connected database by using the mysql_query() function The query is supplied as the argument for this function along with the database handle ($dbh) 5 After the query is done, the script uses mysql_fetch_row() method to extract rows of data from the resulting data set This function returns an array of columns for each row of data returned 6 A printf() function is used to print two elements of the $myRow array Notice that the very first element of the $myRow array is indexed with 0 7 The while loop continues until there are no more rows left for mysql_fetch_row to fetch, at which time the script completes and rest of the HTML document is printed The resulting page looks as follows on some sample data:
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<html> <head><title>Simple Query Script</title></head> <body> <table border=1> <tr><th>Name</th> <th>Password</th></tr> <tr><td>kabir</td><td>mysecret1</td></tr><tr><td>esmith</td>< td>sale007</td></tr>
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