string output formatter

This function is mainly for debugging purposes. Basically it shows where all the newlines, carriage returns, nulls, and tabs are located.

<?php function dump_opt($string, $return = false){ 
    $find     =  array("\n",     "\0",     "\t",     "\r"); 
    $replace  =  array("\n".'\n',"\0".'\0',"\t".'\t',"\r".'\r'); 
    $string = str_replace($find, $replace, $string); 
    if((bool)$return) 
        return $string; 
    else 
        echo  $string; 
} 
$string = <<<STR This string has some new lines 
in it 
it may have a carriage return or two as well. STR; dump_opt($string); ?>