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run code in 150+ php & hhvm versions
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<?php $fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple"); function test_alter(&$item1, $key, $prefix) { $item1 = "$prefix: $item1"; } function test_print($item2, $key) { echo "$$key = '$item2';\n"; } echo "Before ...:\n"; array_walk($fruits, 'test_print'); ?>
based on mXO2A
Output for 4.3.0 - 7.1.0
Before ...: $d = 'lemon'; $a = 'orange'; $b = 'banana'; $c = 'apple';