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run code in 150+ php & hhvm versions
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<?php $a = array(1, 2, 3); $b = '<id>' . join('</id><id>', $a) . '</id>'; var_dump($b); ?>
Output for 4.3.0 - 7.1.0
string(30) "<id>1</id><id>2</id><id>3</id>"