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<?php var_dump(explode(',', 99)); var_dump(explode(',', '99'));
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
array(1) { [0]=> string(2) "99" } array(1) { [0]=> string(2) "99" }