<?php

class Security {

	public static $String;
	public static final function deleteSpecialChars($del_badchar) {

		$MaxStringSearchLenght = 200;

		if ( strlen($del_badchar) > $MaxStringSearchLenght ) {
			# lösche alles nach dem 200sten zeichen bei überlangen eingaben
			$del_badchar = substr($del_badchar, 0, $MaxStringSearchLenght);		
		};

		$del_badchar = preg_replace("/[^a-z0-9\s+]/i", " ", $del_badchar);
		$code_entities_match	= array(' ','--','&quot;','!','@','#','$','%','^','&','*','(',')','_','{','}','|',':','"','<','>','?','[',']','\\',';',"'",',','.','/','*','~','`','=');
		$code_entities_replace	= array(' ',' ','','','','','','','','','','','','','','','','','','','','','','');
		$del_badchar			= str_replace($code_entities_match, $code_entities_replace, $del_badchar);

		$del_badchar			= addslashes($del_badchar);
		$del_badchar			= strip_tags($del_badchar);
		$del_badchar			= escapeshellcmd($del_badchar);

		return $del_badchar;
		
	}
}
?>