try - catch

<?php
//HARUSNYA
$error=null; /*asumsikan WAJIB*/
try{
    $sql = '';
    $query= $con->prepare($sql);
    $query->bindParam(1, $foto);
    $query->bindParam(2, $foto);
    $result = $query->execute();
}
catch(PDOException $e){
    $error= $e->getMessage();
    $result=false;
}

if($result){
    //jalankan script OK
}
else{
    die( $error);

}