How do I search and replace an entire multi-level array in PHP?

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.

why not create a function for that? I see you can do it...

user1646111
– user1646111

2013-02-06 16:17:53 +00:00
Commented Feb 6, 2013 at 16:17 — user1646111
– user1646111, Commented Feb 6, 2013 at 16:17

Yoshi · Accepted Answer · 2013-02-06 16:30:01Z

5

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

edited Feb 6, 2013 at 16:30

answered Feb 6, 2013 at 16:21

Yoshi

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1 Comment

Volomike Over a year ago

I just never had the need to do this before until now, and wasn't aware of the array_walk_recursive() function before. Awesome that you found that, and awesome that you knew of the &$val thing.

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