Check if image exists in folder or not currupted in php

Check if image exists in folder or not currupted in php::

$full_path = Full Image path; (Like: ../dd/tmp.jpg)

if(!file_exists($full_path)){

    //Image Not Available or Not Exists

}else{
    //Image File Exists 

  //Check if image not damaged.
    $ext = strtolower(pathinfo($full_path, PATHINFO_EXTENSION));
    if ($ext === 'jpg') { $ext = 'jpeg'; }
    $function = 'imagecreatefrom' . $ext;

    if (function_exists($function) && @$function($full_path) === FALSE) 
    {
//Image Is Corrupted or Damaged.
    }else{
// Image is Ok
    }
}