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{ php }  
  array_extract
date 2004
update 2004
code 
<?php
function array_extract($array,$getkeys,$depth=0) {    //Ichier 2004
    if($depth==0) {
        foreach($array as $key => $val) {
            if(is_array($getkeys)) {
                if(in_array($key,$getkeys)) { $res[$key] = $val; }
            } else {
                if($key==$getkeys) { $res = $val; }
            }
        }
        return $res;
    }
    while ($depth>0) {
        --$depth;
        foreach($array as $val) {
            $tmp[] = array_extract($val,$getkeys,$depth);
        }
        $array = $tmp;
        unset($tmp);
    }
    return $array;
}
?>
description extract parts from an array recoursiveley by keys only to a certain dpth. only the keys given will remain.
syntax 
<?php
array = array_extract(array haystack, array needle, int maxdepth);
?>
explanation suppose you have the array:
<?php
    $array["bands"]["abc"][0]["name"] = "Butthole Surfers";
    $array["bands"]["abc"][0]["hobby"] = "Music";
    $array["bands"]["abc"][1]["name"] = "Björk";
    $array["bands"]["abc"][2]["name"] = "Brainless Wankers";
    $array["bands"]["def"][0]["name"] = "Deftones";
    $array["bands"]["mno"][0]["name"] = "Mr. Bungle";
    $array["albums"]["abc"][0]["name"] = "Between Heaven and Hell";
    $array["albums"]["def"][0]["name"] = "Dummy";
    $array["albums"]["def"][1]["name"] = "Fantastic Spikes Through Balloons";
    $array["genre"]["abc"][0]["name"] = "Alternative";
?>

and you were searchiong for every stuff of 'abc':
<?php
    $array = array_extract($array,"abc",1);
?>

you would get:
<?php
    $array[0][0]["name"] = "Butthole Surfers";
    $array[0][0]["hobby"] = "Music";
    $array[0][1]["name"] = "Björk";
    $array[0][2]["name"] = "Brainless Wankers";
    $array[1][0]["name"] = "Between Heaven and Hell";
    $array[2][0]["name"] = "Alternative";
?>
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