How can I match values from two arrays?

Question

Using PHP, how can I match subscribers to users with these two arrays?

$subscribers

Array
(
    [0] => stdClass Object
        (
            [meta_id] => 1
            [email] => [email protected]
        )

)

$users

Array
(
    [0] => stdClass Object
        (
            [ID] => 1
            [user_email] => [email protected]
        )

    [1] => stdClass Object
        (
            [ID] => 2
            [user_email] => [email protected]
        )

I thought this would do it...

<?php
foreach ( $users as $user ) {
    if ( in_array( '[email protected]', $subscribers ) ) {
        echo 'Matched user';
    }
}

cdhowie · Accepted Answer · 2012-10-02 18:51:02Z

3

foreach ($users as $user) {
    foreach ($subscribers as $subscriber) {
        if ($user->user_email === $subscriber->email) {
            echo 'Matched user';
            break;
        }
    }
}

answered Oct 2, 2012 at 18:51

cdhowie

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4 Comments

developdaly Over a year ago

I just realized why mine isn't working. $subscribers is an array. $users is an object. Have a tweak to make that work?

cdhowie Over a year ago

From what you pasted, $users is an array of objects, as is $subscribers. If it's not, then you need to fix your question to reflect the real value stored in that variable.

developdaly Over a year ago

Nevermind. Turns out that it was just a matter of case differences! strltolower( $user->user_email ) fixed it. Thanks.

cdhowie Over a year ago

Do not use strtolower() on email addresses. The mailbox name is case-sensitive according to the RFC. In other words, in "[email protected]", "test" is case-sensitive. ("example.com" is not.) "[email protected]" and "[email protected]" are different mailboxes.

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