Ichier [ichier's coding corner]

{ 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"; ?>`