On 15 March 2010 23:45, Daevid Vincent <dae...@daevid.com> wrote:
> Anyone have a function that will return an integer of the number of
> dimensions an array has?
/**
* Get the maximum depth of an array
*
* @param array &$Data A reference to the data array
* @return int The maximum number of levels in the array.
*/
function arrayGetDepth(array &$Data) {
static $CurrentDepth = 1;
static $MaxDepth = 1;
array_walk($Data, function($Value, $Key) use(&$CurrentDepth,
&$MaxDepth) {
if (is_array($Value)) {
$MaxDepth = max($MaxDepth, ++$CurrentDepth);
arrayGetDepth($Value);
--$CurrentDepth;
}
});
return $MaxDepth;
}
Extending Jim and Roberts comments to this. No globals. By using a
reference to the array, large arrays are not copied (memory footprint
is smaller). And by using array_walk, a separate internal pointer is
used, so no need to worry about losing your position on the array.
Something to watch out for though is recursion in the array. If a
value in the array is a reference to another part of the array, you
are going to loop around for ever.
$Data = array(&$Data);
for example, with the line ...
echo "$CurrentDepth, $MaxDepth, $Key\n";
in the callback function() will report 17701 before crashing out (no
stack error surprisingly enough).
Regards,
Richard Quadling.
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