1) Function for stripping out malicious bits

<?php
functioncleanInput($input){ 
  $search =array('@<script[^>]*?>.*?</script>@si',// Strip out javascript
'@<[\/\!]*?[^<>]*?>@si',// Strip out HTML tags
'@<style[^>]*?>.*?</style>@siU',// Strip style tags properly
'@<![\s\S]*?--[ \t\n\r]*>@'// Strip multi-line comments
); 
    $output =preg_replace($search,'', $input);return $output;}?>

2) Sanitization function

Uses the function above, as well as adds slashes as to not screw up database functions.

<?php
functionsanitize($input){if(is_array($input)){foreach($input as $var=>$val){            $output[$var]=sanitize($val);}}else{if(get_magic_quotes_gpc()){            $input =stripslashes($input);}        $input  =cleanInput($input);        $output =mysql_real_escape_string($input);}return $output;}?>

Usage

<?php
  $bad_string ="Hi! <script src=' http://www.evilsite.com /bad_script.js'></script> It's a good day!";  $good_string =sanitize($bad_string);// $good_string returns "Hi! It\'s a good day!"
// Also use for getting POST/GET variables
  $_POST =sanitize($_POST);  $_GET  =sanitize($_GET);?>

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This is terrible advice. Never do this. Sanitizing your own input will get you in trouble in some many ways.
There are so many creative ways to inject malformed and evil input into a database for SQL injection.

The best way to handle untrusted inputs is to delegate to the Database driver. Use prepared statements, with parameters

With PHP, you can get the benefit of that using PDO.

DonSegmond:
This is terrible advice. Never do this. Sanitizing your own input will get you in trouble in some many ways.
There are so many creative ways to inject malformed and evil input into a database for SQL injection.

The best way to handle untrusted inputs is to delegate to the Database driver. Use prepared statements, with parameters

With PHP, you can get the benefit of that using PDO.

lolzz you are saying rubbish man! total junk!!!

D34lw4p:


lolzz you are saying rubbish man! total junk!!!

do you mean PDO is rubbish or you meant to say that using your own string as a test argument for your functions is best.
please shed more light.

secondly did you create the functions yourself

Not advisable at all.