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<?php var_dump(explode(',', null)); var_dump(implode(',', array_merge(explode(',', null), array('1', '2'))));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0, 7.0.0 - 7.1.0
array(1) { [0]=> string(0) "" } string(4) ",1,2"
Output for hhvm-3.12.0
Warning: explode() expects parameter 2 to be string, null given in /in/AIuGp on line 3 NULL Warning: explode() expects parameter 2 to be string, null given in /in/AIuGp on line 5 Warning: array_merge() expects parameter 1 to be array, null given in /in/AIuGp on line 5 Warning: Invalid operand type was used: implode() expects a container as one of the arguments in /in/AIuGp on line 5 NULL