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run code in 150+ php & hhvm versions
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<?php $a = array(); $a[0] = 'a'; $a[2] = 'c'; $a[1] = 'b'; echo join(',', $a) . "\n"; ?>
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
a,c,b