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19 years ago
Also, here is the same formula presented in a somewhat more human-readable way, if you'd rather:

<?php
$MB = Pow(1024,2);   // number of bytes in 1M
$K64 = Pow(2,16);    // number of bytes in 64K
$TWEAKFACTOR = 1.8;   // Or whatever works for you
$memoryNeeded = round( ( $imageInfo[0] * $imageInfo[1]
                                        * $imageInfo['bits']
                                        * $imageInfo['channels'] / 8
                          + $K64
                        ) * $TWEAKFACTOR
                     );
$memoryHave = memory_get_usage();
$memoryLimitMB = (integer) ini_get('memory_limit');
$memoryLimit = $memoryLimit * $MB;

if ( function_exists('memory_get_usage') 
     && $memoryHave + $memoryNeeded > $memoryLimit 
   ) {
   $newLimit = $memoryLimitMB + ceil( ( $memoryHave 
                                      + $memoryNeeded 
                                      - $memoryLimit 
                                      ) / $MB 
                                    );
   ini_set( 'memory_limit', $newLimit . 'M' );
}
?>
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