image - Super fast getimagesize in php

Question

I am trying to get image size (image dimensions, width and height) of hundreds of remote images and getimagesize is way too slow.

I have done some reading and found out the quickest way would be to use file_get_contents to read a certain amount of bytes from the images and examining the size within the binary data.

Anyone attempted this before? How would I examine different formats? Anyone has seen any library for this?

Answer 1

function ranger($url){
    $headers = array(
    "Range: bytes=0-32768"
    );

    $curl = curl_init($url);
    curl_setopt($curl, CURLOPT_HTTPHEADER, $headers);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
    $data = curl_exec($curl);
    curl_close($curl);
    return $data;
}

$start = microtime(true);

$url = "http://news.softpedia.com/images/news2/Debian-Turns-15-2.jpeg";

$raw = ranger($url);
$im = imagecreatefromstring($raw);

$width = imagesx($im);
$height = imagesy($im);

$stop = round(microtime(true) - $start, 5);

echo $width." x ".$height." ({$stop}s)";

test...

640 x 480 (0.20859s)

Loading 32kb of data worked for me.