id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
18230	Optimize wp_list_pluck	Otto42	ryan	"wp_list_pluck is a bit slow when dealing with objects, due to the array cast. Since we mostly use objects, this is a problem.

Proof code of a speedup enhancement:

{{{
function old_wp_list_pluck( $list, $field ) {
	foreach ( $list as $key => $value ) {
		$value = (array) $value;
		$list[ $key ] = $value[ $field ];
	}

	return $list;
}

function new_wp_list_pluck( $list, $field ) {
	foreach ( $list as $key => $value ) {
		if (is_object($value)) $list[$key] = $value->$field;
		else $list[$key] = $value[ $field ];
	}

	return $list;
}

// tested on a site with about 40 tags in the DB
$terms = get_terms('post_tag');

// run both old an new code 10000 times and measure the differences

$start = microtime(true);
for ($i = 1; $i <= 10000; $i++) {
	old_wp_list_pluck($terms,'name');
}	
$end = microtime(true);
var_dump($end - $start);

$start = microtime(true);
for ($i = 1; $i <= 10000; $i++) {
	new_wp_list_pluck($terms,'name');
}
$end = microtime(true);
var_dump($end - $start);
}}}

Result:

float(0.85771203041077)
float(0.36069202423096)

New version is slightly more than twice as fast.

Patch forthcoming.
"	enhancement	closed	normal	3.3	Performance		normal	fixed	has-patch