Convert numbers to words.

numToStr.php

<?php

function numToStr($val) {
    $aLookup = array(
        0 => "zero",
        1 => "one",
        2 => "two",
        3 => "three",
        4 => "four",
        5 => "five",
        6 => "six",
        7 => "seven",
        8 => "eight",
        9 => "nine");

    $aVal = str_split($val);

    $return = '';
    foreach($aVal as $tmp) {
        if(array_key_exists($tmp, $aLookup))
            $return .= $aLookup[$tmp]." ";
        else
            $return .= $tmp." ";
    }

    echo $return;
}

numToStr("3735711A2387480E95AC924588038B49");