<?php $fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple"); function test_alter(&$item1, $key, $prefix) { $item1 = "$item1 : $prefix"; } function test_print($item2, $key) { echo "$key. $item2\n"; } echo "Before ...:\n"; array_walk($fruits, 'test_print'); // array_walk($fruits, 'test_alter', 'fruit'); echo "... and after:\n"; array_walk($fruits, 'test_print'); ?>
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