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run code in 200+ php & hhvm versions
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<?php $x = array(0 => 1, 'a' => 'b'); echo $x; echo "\n"; foreach ($x as $k => $v) { echo "$k = $v \n"; } ?>
Output for 5.4.0 - 7.2.0
Notice: Array to string conversion in /in/ij6el on line 3 Array 0 = 1 a = b
Output for 4.3.0 - 5.3.29
Array 0 = 1 a = b