Description:
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Just run the script and watch the memory consumption rise. It goes way beyond the specified memory limit, therefore i suspect a simple memory leak.

Not reproducable on 7.0.x. 
Not reproducable on 5.4.x.

Bug must have been introduced with PHP 5.5. This is the first affected version.

Test script:
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<?

while(true) { microtime(); }

Expected result:
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Steady memory consumption.

Actual result:
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Right before max_execution_time occurs, php.exe is consuming a few hundred megabytes of RAM.