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Check image dimensions (height and width) before uploading image 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';
}


}


?>

array getimagesize ( string $filename [, array &$imageinfo ] )

$test = getimagesize('../bilder/' . $filnamn);
$width = $test[0];
$height = $test[1];

if ($width > 1000 || $height > 1000)
{
echo '<p>iamge is to big';
unlink('../bilder/'.$filnamn);
}