Re: Performance question about create_function
| From: | Michael Stillwell | Date: | Sat, 24 Oct 2009 13:09:51 +0000 |
| Subject: | Re: Performance question about create_function | ||
| References: | 1 | Groups: | php.internals |
| Request: | Send a blank email to internals+get-45876@lists.php.net to get a copy of this message | ||
On Mon, Oct 19, 2009 at 1:13 PM, Mathieu Suen
<mathieu.suen@easyflirt.com> wrote:
> Looking at the way array_map is working, it could worth to use
> create_function for object.
>
> For example if I got a list of object:
>
> $callback = create_function($element, 'return $selement->getId();');
> $ids = array_map($callback, $someInstances);
>
>
> But I don't know if it's cost a lot in performance instead of the ugly
> verbose way:
>
> $ids = array();
> foreach($someInstances)
> {
> $ids[] = $someInstances->getId();
> }
I think what you want to do can be done with anonymous functions:
$arr1 = array(
(object) array("id" => 56),
(object) array("id" => 42)
);
$ids = array_map(function($obj) { return $obj->id; }, $arr1);
print_r($ids);
produces:
Array
(
[0] => 56
[1] => 42
)
Michael
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