Online PHP editor | output for 605SI

@ 2013-10-23T09:50:20Z

<?php

$selected_emails = array(
  16781 => "xxx@gmail.com",
  16782 => "yyy@gmail.com",
  16785 => "xxx@gmail.com,yyy@gmail.com",
  16789 => "yyy@gmail.com",
  16751 => "xxx@gmail.com,yyy@gmail.com,zzz@gmail.com",
  16729 => "zzz@gmail.com,bbb@gmail.com"
);

$final_array = array();

foreach ($selected_emails as $newsletter => $emails) {
    foreach (explode(',', $emails) as $email) {
        $final_array[$email][] = $newsletter;
    }
}

var_dump($final_array);

Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.0 - 7.0.20, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6: array(4) { ["xxx@gmail.com"]=> array(3) { [0]=> int(16781) [1]=> int(16785) [2]=> int(16751) } ["yyy@gmail.com"]=> array(4) { [0]=> int(16782) [1]=> int(16785) [2]=> int(16789) [3]=> int(16751) } ["zzz@gmail.com"]=> array(2) { [0]=> int(16751) [1]=> int(16729) } ["bbb@gmail.com"]=> array(1) { [0]=> int(16729) } }

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