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php validate image type

You can validate image in php, this way:

<?php
    $img = "banner.gif"; // an image
    $info = getimagesize($img);
    print image_type_to_mime_type($info[2]);
?>

The outout will generally be: image/jpeg or image/gif or image/png
But if it is: application/octet-stream, then the file is not an image.
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