3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = [ ['foo' => 'a', 'bar' => 1], ['foo' => 'b', 'bar' => 2], ]; foreach ($array as $x => ['new' => &$x]); var_export($array);
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array ( 0 => array ( 'foo' => 'a', 'bar' => 1, 'new' => 0, ), 1 => array ( 'foo' => 'b', 'bar' => 2, 'new' => 1, ), )
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67.14 ms | 992 KiB | 4 Q