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

<?php
list($width, $height, $type, $attr) = getimagesize("tutorialpro-logo.png");
echo "Width: " . $width;
echo "Height: " . $height;
echo "Type: " . $type;
echo "Attributes: " . $attr;
?>

Width: 290
Height: 69
Type: 3
Attributes: width="290" height="69"

<?php
$remote_png_url = 'http://www.tutorialpro.org/wp-content/themes/w3cschool.cc/assets/img/logo-domain-green2.png';
$img_data = getimagesize($remote_png_url);
print_r($img_data);
?>

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