Recursion-safe php variable dumper

print_re.php

<?php
function print_re($data, $depth = 0, $max = 5) {

    if(!headers_sent()) {
        header('content-type: application/json');
    }
    $sp = str_repeat("    ", $depth);

    if(is_numeric($data)) {
        echo $data;
        return;
    }
    if(is_bool($data)) {
        echo $data ? 'true' : 'false';
        return;
    }
    if(is_null($data)) {
        echo 'null';
        return;
    }
    if(!is_object($data) && !is_array($data)) {
        echo '"' . trim(var_export($data, 1), "'") . '"';
        return;
    }

    if($depth >= $max) {
        echo '"*max depth reached*"';
        return;
    }

    if(is_object($data)) {
        // Uncomment this line to get class types, but breaks JSON format
        #echo '('. get_class($data) .')';
    }

    if($data instanceof \JsonSerializable) {
        $data = $data->jsonSerialize();
    }

    end($data);
    $last = key($data);

    echo "{\n";
    foreach($data as $k => $d) {
        echo "$sp    \"$k\": ";
        print_re($d, $depth+1);
        next($data);
        echo ($k === $last) ? "\n" : ",\n";
    }
    echo "$sp}";
}