PHP versions prior to 5.4 didn't have JSON_PRETTY_PRINT for json_encode, so here, I guess...

json_pretty_encode.php

<?php
//PHP got the JSON_PRETTY_PRINT option for json_encode in 5.4, and I had to use a older version of PHP,
// So I made this
function json_pretty_encode($arr, $indent="    ", $characters=array(", ", ": "), $depth=0, $eol=PHP_EOL){
    //You'd think that with the plethora of functions PHP has for array operations, they'd have one to check
    // if an array is associative or not
    // Now, I know what your saying "Oh, but, ALL arrays in PHP are associative!" Suck it, you know what I mean
    $is_assoc = (array_keys($arr) !== range(0,count($arr)-1));
    
    end($arr);
    $last = key($arr);
    $result = ($is_assoc?"{":"[").$eol; //Print whether or not the array is an object
    foreach($arr as $key=>$val){
        $result .= str_repeat($indent, $depth+1);//Indent it
        if($is_assoc) // if is assocative, print the key name
            $result .= "\"$key\"".$characters[1];
        if(is_array($val)) //If the value is an array, encode that
            $result .= json_pretty_encode($val, $indent, $characters, $depth+1, $eol);
        else if(is_bool($val)) //ensure boolean values are printed as such
            $result .= $val?"true":"false";
        else if(is_numeric($val)) //Print out numbers
            $result .= $val;
        else //Everything else is a string
            $result .= "\"".addslashes($val)."\"";
        //if this is the last element just print a newline, otherwise print $characters[0]
        $result .= (($key==$last)?"":$characters[0]).$eol;
    }
    $result .= str_repeat($indent, $depth).($is_assoc?"}":"]"); //Close the object
    return $result;
}
//Test it...
$arr = array(   "success"=>true, 
                "blah", 
                "results"=>array(
                    array(
                        "message"=>"blah", 
                        "time"=>1234.0000
                    ),
                    array(
                        "message"=>"Another message", 
                        "time"=>6.022e23
                    )
                )
            );

print(json_pretty_encode($arr));