Check image dimensions (height and width) before uploading image using PHP

Question

How can I check for height and width before uploading image, using PHP.

Must I upload the image first and use "getimagesize()"? Or can I check this before uploading it using PHP?

<?php  foreach ($_FILES["files"]["error"] as $key => $error) { if( $error == UPLOAD_ERR_OK && $_FILES["files"]["size"][$key] < 500000  && $_FILES["files"]["type"][$key] == "image/gif" || $_FILES["files"]["type"][$key] == "image/png" || $_FILES["files"]["type"][$key] == "image/jpeg" || $_FILES["files"]["type"][$key] == "image/pjpeg"  ){   $filename = $_FILES["files"]["name"][$key];         if(HOW TO CHECK WIDTH AND HEIGHT) { echo '<p>image dimenssions must be less than 1000px width and 1000px height'; }   }        ?> 

Answer 1

We can do this with temp file easily.

$image_info = getimagesize($_FILES["file_field_name"]["tmp_name"]); $image_width = $image_info[0]; $image_height = $image_info[1]; 

Answer 2

This is how I solved it.

$test = getimagesize('../bilder/' . $filnamn); $width = $test[0]; $height = $test[1];  if ($width > 1000 || $height > 1000) { echo '<p>iamge is to big'; unlink('../bilder/'.$filnamn); }