Description:
------------
Looks like function gd_info() has some memory leak inside. (GD version bundled 2.0.28)

Reproduce code:
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<?php
echo 'Memory usage:' . memory_get_usage() . "\n";
gd_info();
echo 'Memory usage:' . memory_get_usage() . "\n";
?>

Expected result:
----------------
Memory usage:2711584
Memory usage:2711584

Actual result:
--------------
Memory usage:2711584
Memory usage:2712368