Online PHP editor | refs for QfQQ8

@ 2017-11-01T21:08:01Z

<?php

    $str = "111000111111";
    //preg_match_all('/(.)\1*/', $str, $match);
    $digits = str_split($str, 4);
    $replace = array("1110" => "A", "0011" => "B", "1111" => "C");

    Foreach($digits as $val){
         Echo $replace[$val];
    }