imagecreatefromgif() returns an image identifier representing the image obtained from the given filename.
imagecreatefromgif() returns an empty string on failure. It also outputs an error message, which unfortunately displays as a broken link in a browser. To ease debugging the following example will produce an error GIF:
注: GIF support was removed from the GD library in Version 1.6, and added back in Version 2.0.28. This function is not available between these versions.
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