Counting a nested array

[salamander 80]

I have an array that's like below. As you can see, it's an array that encompasses an array (that encompasses another array, etc.) and each children contains a random number of items. Basically, for each main array, i need to go through all its children and count up how many of them contains "allday".

What's the best way to deal with the problem?

Array
(
 [0] => Array
 ( 
 [children] => Array
 (  
 [0] => Array
 (
 [name] => xproperties
 [attributes] => Array
 (
  [name] => [b]allday[/b]
 )
 [content] => 
 [children] => Array
 (
  [0] => Array
  (
  [name] => xprop
  [attributes] => 
  [content] => yes
  )
 )
 )
[1] => Array
(
[name] => xproperties
[attributes] => Array
(
[name] => link
)
[content] => 
[children] => Array
(
[0] => Array
(
[name] => xprop
[attributes] => 
[content] => http://www.example.com
)
)
)
 [1] => Array
 (
 
 [children] => Array
 (
 [0] => Array
 (
 [name] => id
 [attributes] => 
 [content] => 12345
 )
and so on....

[cameraman]

Welcome to WebmasterWorld, salamander80!

If you're running php5, have a look at array_walk_recursive() [php.net].
If you're running php4, have a look at array_walk() [php.net].

With the former, your callback function would be very simple, just incrementing a global variable:
$count = 0;
function count_allday($item,$key) {
global $count;
if($item == 'allday')
$count++;
} // end count_allday()

You can simulate the the behaviour of array_walk_recursive with array_walk by checking (inside your callback function) to see if $item is an array with is_array() [php.net] - if it is, call array_walk again on $item and specifying the same function.