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run code in 150+ php & hhvm versions
Bugs & Features
<?php $a = array(1, 2); $b = '<id>' . join('</id><id>', $a) . '</id>'; var_dump($b); ?>
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
string(20) "<id>1</id><id>2</id>"
Output for hhvm-3.10.0

Process exited with code 153.