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<?php preg_match( '#(\d+)(K|M|G|)#', '43G', $matches ); //ini_set( 43 ); var_dump( $matches );
Output for 4.3.0 - 7.2.0
array(3) { [0]=> string(3) "43G" [1]=> string(2) "43" [2]=> string(1) "G" }