(PECL imagick 2, PECL imagick 3)
Imagick::getImageGeometry — Gets the width and height as an associative array
public Imagick::getImageGeometry ( ) : array
Returns the width and height as an associative array.
Returns an array with the width/height of the image.
Throws ImagickException on error.
Example #1 Imagick::getImageGeometry()
<?php
function getImageGeometry($imagePath) {
    $imagick = new \Imagick(realpath($imagePath));
    header("Content-Type: image/jpg");
    echo $imagick->getImageBlob();
}
?> 
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    https://www.php.net/manual/en/imagick.getimagegeometry.php