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getimagesize()

« gethostname | getlastmod »
<?php
$array 
getimagesize (
    
// string $filename
    
  // [array &$imageinfo]
);
?>
Result
$array = false
PHP warning : getimagesize(https://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Wikipedia-logo-v2-en.png/120px-Wikipedia-logo-v2-en.png): failed to open stream: HTTP request failed! HTTP/1.1 403 Forbidden. Please comply with the User-Agent policy: https://meta.wikimedia.org/wiki/User-Agent_policy
Examples
#1 getimagesize  ("/home/micmap/www/php-by-example/logo.gif")
#2 getimagesize  ("https://upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Wikipedia-logo-v2-en.png/120px-Wikipedia-logo-v2-en.png")
#3 getimagesize  ("http://upload.wikimedia.org/wikipedia/commons/thumb/e/ec/Wiktionary-logo.svg/370px-Wiktionary-logo.svg.png")
See also
exif_imagetype, exif_read_data, exif_thumbnail, image_type_to_mime_type