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<?php $arr = array(); function a( $arr ) { $arr[] = 'a'; } function b( &$arr ) { $arr[] = 'b'; } a($arr); var_dump($arr); b($arr); var_dump($arr);
Output for 4.3.0 - 7.2.0
array(0) { } array(1) { [0]=> string(1) "b" }