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array getimagesizefromstring ( string $imagedata [, array &$imageinfo ] )

<?php
$img = 'tutorialpro-logo.png';

// Open as a file
$size_info1 = getimagesize($img);

// Open as a string
$data = file_get_contents($img);
$size_info2 = getimagesizefromstring($data);
print_r($size_info2);
?>

Array
(
    [0] => 290
    [1] => 69
    [2] => 3
    [3] => width="290" height="69"
    [bits] => 8
    [mime] => image/png
)