Description:
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  Any reason why getimagesize couldn't be extended to accept image data in string format such as:

array getimagesize (string $filename | string $string [, array &$imageinfo])

  This would be very handy for pulling image info from data stored in cache (such as APC) or BLOB data from a database without first converting with imagecreatefromstring() -> temp file -> getimagesize($temp_file).

  I see BUG #25507 but no example is given on how to achieve it. It seems to me that the binary data in the string variable is already in the format needed. 

  I'm actually on PHP version 5.1.6 (ubuntu linux) as per phpinfo().

Thank you for your time,
Norman Peelman

Reproduce code:
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Expected result:
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Actual result:
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