This function is currently not documented; only the argument list is available.
This function is EXPERIMENTAL. The behaviour of this function, the name of this function, and anything else documented about this function may change without notice in a future release of PHP. Use this function at your own risk.
Changes the size of an image to the given dimensions and removes any associated profiles. The goal is to produce small low cost thumbnail images suited for display on the Web. If true is given as a third parameter then columns and rows parameters are used as maximums for each side. Both sides will be scaled down until the match or are smaller than the parameter given for the side.