PHP check if file is an image

Question

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Answer 1

The getimagesize() should be the most definite way of working out whether the file is an image:

if(@is_array(getimagesize($mediapath))){
    $image = true;
} else {
    $image = false;
}

because this is a sample getimagesize() output:

Array (
[0] => 800
[1] => 450
[2] => 2
[3] => width="800" height="450"
[bits] => 8
[channels] => 3
[mime] => image/jpeg)