3v4l.org

run code in 500+ 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 - 8.2.31, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8
array ( 0 => array ( 'foo' => 'a', 'bar' => 1, 'new' => 0, ), 1 => array ( 'foo' => 'b', 'bar' => 2, 'new' => 1, ), )
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63.33 ms | 1043 KiB | 4 Q