php - taking safe input from url and making my input hacking safe -

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i have following method in php crud class: 

//secure search method     function secureinput($ary = array()){         $this->connect();         $securedarray = array();         //print_r($ary);         foreach($ary $val){             //echo($val.'<br />');             $val = str_replace("'","",$val);             $val = str_replace("#","",$val);             $val = str_replace("~","",$val);             $val = str_replace("!","",$val);             $val = str_replace("%","",$val);             $val = str_replace("*","",$val);                 $val = str_replace("drop","",strtolower($val));             $val = str_replace("show","",strtolower($val));             $val = str_replace("insert","",strtolower($val));             $val = str_replace("create","",strtolower($val));             $val = str_replace("update","",strtolower($val));             $val = str_replace("select","",strtolower($val));             $val = str_replace('"',"",$val);             $val = str_replace("+","",$val);             $val = str_replace(";","",$val);             $val = mysql_real_escape_string($val);             $securedarray[] = $val;             }             return $securedarray;         }

i want use following code take input , return clean input (hacking xss proof input) , use database queries insert update , retrieve etc

require_once('classes/classes.php');  $crud = new crud(); $ar = array("shah hussai#n","shahhus';sai;'n3#05@xyz.com","",234); $name = "";$email = "";$empty ="";$int = ""; $ary = $crud->secureinput($ar);  if(!isset($ary[0]) || empty($ary[0])){     echo("please provide name<br />");     } else{     //update variables here     $name = $ary[0];     $email = $ary[1];     $empty = $ary[2];     $int = $ary[3];     }//if echo $sql = "insert tbl(name,email...) values($name,$email,$empty,$int)";

now not sure either protect code hackers cross scripting , sql injection attempts? or should else taking input safely?

thanks in advance

to protect sql injections best use prepared statement.provided link in case.
other risks better specific answer.


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