<?php
$emails = 'obijma@gmag,email1@example.com+email2@example.com';
    function multiexplode ($delimiters,$string) {
        $ary = explode($delimiters[0],$string);
        array_shift($delimiters);
        if($delimiters != NULL) {
            foreach($ary as $key => $val) {
                 $ary[$key] = multiexplode($delimiters, $val);
            }
        }
        return  $ary;
    }
    $string = "1-2-3|4-5|6:7-8-9-0|1,2:3-4|5";
    $delimiters = Array(",","+","|","-");
 
    $emailsSplitted = multiexplode($delimiters,$emails);
 
    foreach ($emailsSplitted as $email) 
{
echo implode($email);
}

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