An example of regular filtering in php to prevent sql injection

include("config.php");
if($_GET["id"])
{
 $_GET["id"]=inject_check($_GET["id"] );
 echo $id;
}

function inject_check($sql_str) {
 $check= eregi('select|insert|update|delete|'|/* |*|../|./|union|into|load_file
|outfile', $sql_str);
 if($check)
 {
 echo "Illegal character!";
 exit();
 }else
 {
 return $sql_str;
 }
}
?>

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