- array_map: documentation ( source)
- print_r: documentation ( source)
<?php
$_arr = array('test1', 'test2', 'test3');
$_string = 'TestWalk';
print "<pre>";
print_r(array_map(function($_arr) { return 'TestWalk' . $_arr; }, $_arr));
//print_r(array_walk($_arr, function(&$item1, $key, $prefix) { return $prefix . $item1; }), $_string);