如何在PHP中搜索和替换整个多级数组？

Question

How do I search and replace an entire multi-level array in PHP? As in something like:

$a = array(
  'level1' => array(
    'level2' => array(
      'level3' => 'foo'
    )
    'level2b' => array(
      'level3b' => 'foo'
    )
);

So, replace 'foo' with 'bar'.

BACKGROUND: I'm having to do this on a serialized array from a WordPress blog since we're moving this blog to another directory name.

Answer 1

Very simple with array_walk_recursive

array_walk_recursive($a, function (&$val) {
  $val = str_replace('foo', 'bar', $val);
});

print_r($a);

Just make sure to use a reference (&$val).

demo: http://codepad.viper-7.com/7L33Fg