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<?php preg_match( '#(\d+)(K|M|G)#', ini_get('memory_limit'), $matches ); var_dump( $matches );
Output for 5.2.1 - 5.6.28, 7.0.0 - 7.1.0
array(3) { [0]=> string(3) "64M" [1]=> string(2) "64" [2]=> string(1) "M" }
Output for 4.3.0 - 5.2.0, hhvm-3.10.0 - 3.12.0
array(0) { }