Extract email list from Outlook or Gmail address string

ExtractEmailListFromOutlookGmailAddresses.php

<?php
function extract_emails($string) {
	$separator = ';';
	if(!stripos($string, ';') && stripos($string, ','))
		$separator = ',';
	$list = explode($separator, $string);
	$email_list = array();
	foreach($list as $item) {
		$item = trim($item);
		$start = 0;
		$length = strlen($item);
		if($length==0 || !stripos($item, '@'))
			continue;
		$start_bracket = stripos($item, '<');
		$end_bracket = stripos($item, '>');
		if($start_bracket && $end_bracket) {
			$start = $start_bracket + 1;
			$length = $end_bracket - $start_bracket - 1;
		}
		$email = trim(substr($item, $start, $length));
		$email_list[] = strtolower($email);
	}
	return $email_list;
}
?>