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| Title : |
Check parameters validity. Paranoia was designed to check the validity of the parameters that a php page will receive after a form submission. It can be used to check the variables sent by POST or GET |
| Categories : |
Algorithms, HTML and PHP, PHP, Variables |
Ovidiu EFTIMIE |
| Date : |
Feb 15th 2001 |
| Grade : |
2 of 5 (graded 4 times) |
| Viewed : |
12004 |
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| Action : |
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| Tools : |
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<?php
/****************************************************************
*Author: Ovidiu EFTIMIE
*Copyright:Ovidiu EFTIMIE
*Last modified:Friday, November 03, 2000 10:43:17 AM
*Description : Checks an array to see if it contains invalid chars
*****************************************************************/
class paranoia{
var $wrongParams=false;
var $para=array("~","`","!","@","#","\$","%","^","&","*","(",")","_","-","+","=","|",
"\\","{","}",":",";","\"","'",",","<",".",">","?","/");
/**************************************************
*Class constructor
*Params : $paramsArray - the array containing the data to be checked
***************************************************/
function paranoia($paramsArray){
reset($this->para);
$this->wrongParams=false;
while(list($k,$postvars)=each($paramsArray)){
if(is_array($postvars)){
while(list($r,$postvals)=each($postvars)){
while(list(,$val)=each($this->para)){
$wrong=strchr($postvals,$val);
if(!empty($wrong)){
$this->wrongParams=true;
}
}
}
}else{
while(list(,$val)=each($this->para)){
$wrong=strchr($postvars,$val);
if(!empty($wrong)){
$this->wrongParams=true;
}
}
reset($this->para);
}
}
return $this->wrongParams;
}
/*******************************************************
*Checks to see the invalid chars
********************************************************/
function checkParanoia(){
echo date("d M Y H:i:s",time())."<br>Checking paranoia chars...<br><br>";
while(list($d,$r)=each($this->para)){
echo $d.". <b>".$r."</b> = <b>".ord($r)."</b><br>";
}
}
/********************************************************
*Redirecting function
********************************************************/
function sendBack(){
echo '<html><head><title></title></head><body onLoad="javascript:history.back(-1);"></body></html>';
}
}
?>
=================================================
Example
=================================================
<?php
require_once("paranoia.php");
if(isset($HTTP_POST_VARS)&&!empty($HTTP_POST_VARS)){
$par=new paranoia($HTTP_POST_VARS);
if(!empty($par->wrongParams)){
// $par->sendBack();
echo "Incorrect parameters";
}else{
echo "Corect parameters";
}
}
?>
<html>
<head><title>Test page for paranoia</title></head>
<form action="test_paranoia.php" method="POST">
<input type="text" name="test">
<input type="submit" value="Test">
</form>
</html> | |
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