随机播放和分开相似的字符串

Question

I would like to shuffle emails by domains, making them as far as possible from each other. Example:

Array before:

[e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail]

It would become something like:

Array after:

[e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail], [e-mail]

How can I do it with an Array? If there is any example with PHP it would be great.

Answer 1

<?php

$emails = array(
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',

    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',

    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',

    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',
    '[e-mail]',

);

$organized_emails = array();
$needle_key = 0;
$needle_search = array('gmail', 'yahoo', 'aol', 'others');

while(true) {
    $current_value = array_shift($emails);
    if(strpos($current_value, $needle_search[$needle_key]) !== false) {
        $organized_emails[] = $current_value;
        $needle_key++;
        if($needle_key > 3) {
            $needle_key = 0;
        }
    } else {
        array_push($emails, $current_value);
    }

    if(empty($emails)) {
        break;
    }
}

echo '<pre>';
print_r($organized_emails);
echo '</pre>';

Sorry, I just found what I need at PHP Arrays - Sort by Email Address Domain (alternate)