PHP thumbnail image function code according to maximum width and height

A very simple code to shrink images according to the maximum width and height, which is convenient for novices and people who are too lazy to write it themselves
                 
                                                                                                                                                                                                                                                                                                                   OnFunction Thumb ($ ImageFile, $ maxwidth, $ maxheight) {
$ DIM = GetimageSize ($ ImageFile);
$ width = $ dim [0]; = $ dim [1 ; // Original image aspect ratio
                                                                                                                                                                                                        aspect ratio,        aspect ratio

                                                                                                                         $thumb thumbHeight, $width, $ height);
                return $thumb;
}


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