Login Script - PHPOutput control (or output buffering) allows you to write and execute your scripts normally but send data to the web browser at selected times. The main benefit of this system is that you can call the header(), setcookie() and session_start() functions at any place in your scripts without having to worry about the "headers already sent" error message.
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We’ll use a login script to demonstrate how to use these functions. Below is the code: <?php ob_start(); session_start(); //database connection details: $title = "My Application Title"; $version = "3.0"; //database connection $bdhost="localhost"; $dbuser="root"; $dbpass="pass"; $dbname="users"; $db = mysql_connect($dbhost,$dbuser,$dbpass) or die("Failed to open connection to MySQL server."); mysql_select_db($db) or die("Unable to select database"); //set useful variables $month_names = array("","January","February","March","April","May","June","July","August", //set useful variables $td = date("Y-m-d"); $date_time =date("Y-m-d h:i:s"); //someone registered? if(isset($_GET['reg'])){ $reg="Your details have been added, please login"; } $error=false; $errmsg=""; //has form been submitted if(isset($_POST['key'])){ //check that the username and password is not empty if( empty($_POST['uname']) && (empty($_POST['upass']))){ print "Please enter your username and password."; $errmsg="Please enter your username and password."; $error=true; } //check that the username and password is string if( is_numeric($_POST['uname']) && (is_numeric($_POST['upass']))){ print "Please enter a valid username and password."; $errmsg=" Please enter a valid username and password."; $error=true; } //if no error then start authentication process if(!$error){ //transfer to shorter var $n=$_POST['uname']; $p=$_POST['upass']; //clean using mysql cleaner $cleanuname=mysql_real_escape_string($n); $cleanupass=mysql_real_escape_string($p); $query="select uname,pw from users where uname='$cleanuname' and pw='$cleanupass' "; $result=mysql_query($query); $num=mysql_num_rows($result); if($num>0 ){ //put in session vars session_start(); $mytime=time(); $mytime=date("H:i:s A",$mytime); $_SESSION['time'] = $mytime; $_SESSION['status'] = 'logged'; $_SESSION['username'] = $cleanuname; //goto next page header("location:welcome.php"); exit; } }else{ $_SESSION['status'] = 'not logged'; $errmsg="Your username ($n) and password do not match, please try again."; } } ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><!-- InstanceBegin template="/Templates/was.dwt.php" codeOutsideHTMLIsLocked="false" --> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <!-- InstanceBeginEditable name="doctitle" --> <title>WebSecure::Login</title> <script language="javascript" type="text/javascript"> function checkform(pform1){ if(pform1.uname.value==""){ alert("Please enter a username") pform1.uname.focus() return false } if(pform1.pw.value==""){ alert("Please enter a password") pform1.pw.focus() return false } if(pform1.pw.value=="" && pform1.uname.value==""){ alert("Please make sure that you have entered your username and password") return false } return true } </script> <!-- InstanceEndEditable --> <!-- InstanceBeginEditable name="head" --> <!-- InstanceEndEditable --> <link href="../Templates/was.css" rel="stylesheet" type="text/css" /> </head> <body> <table width="99%" border="1"> <tr> <td bgcolor="#333333" class="header">Web Secure</td> </tr> <tr> <td><!-- InstanceBeginEditable name="main" --> <form name="form1" method="post" action="" onSubmit="return checkform(this)"> <table width="41%" border="0" align="center" cellpadding="0" cellspacing="3"> <tr class="listtop"> <td colspan="3">Login Status:<? if(isset($errmsg)){ echo "$errmsg"; }elseif(isset($reg)){ echo "$reg"; }?></td> </tr> <tr> <td width="9%">Username</td> <td width="41%"><input name="uname" type="text" id="uname" size="50"></td> <td width="50%" rowspan="4"> </td> </tr> <tr> <td>Password</td> <td><input name="upass" type="password" id="upass" size="50"> <input type="hidden" name="key" /></td> </tr> <tr> <td> </td> <td><a href="../password.php">Forgotten your password?</a>|<a href="register.php">Register</a></td> </tr> <tr> <td> </td> <td><input type="submit" name="submit" value="Login"></td> </tr> </table> </form> <!-- InstanceEndEditable --></td> </tr> <tr> <td class="copy">©2008</td> </tr> </table> </body> <!-- InstanceEnd --></html> <? ob_end_flush(); ?>
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Output Buffering With PHP
