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run code in 150+ php & hhvm versions
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<?php $a = array(1, 2, 3); $a = array('1, 2, 3'); var_dump(implode(', ', $a));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(7) "1, 2, 3"