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Date: Sat, 24 Oct 2009 14:09:51 +0100
Message-ID: <140eba4e0910240609k61af639fp8a4ccaf4048b9b5c@mail.gmail.com>
To: Mathieu Suen <mathieu.suen@easyflirt.com>
Cc: internals@lists.php.net
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Subject: Re: [PHP-DEV] Performance question about create_function
From: mjs@beebo.org (Michael Stillwell)

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:
>
> $callback =3D create_function($element, 'return $selement->getId();');
> $ids =3D array_map($callback, $someInstances);
>
>
> But I don't know if it's cost a lot in performance instead of the ugly
> verbose way:
>
> $ids =3D array();
> foreach($someInstances)
> {
> =A0 =A0 =A0 =A0$ids[] =3D $someInstances->getId();
> }

I think what you want to do can be done with anonymous functions:

    $arr1 =3D array(
        (object) array("id" =3D> 56),
        (object) array("id" =3D> 42)
    );

    $ids =3D array_map(function($obj) { return $obj->id; }, $arr1);

    print_r($ids);

produces:

    Array
    (
        [0] =3D> 56
        [1] =3D> 42
    )



Michael

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