<?php
function array_string($arr,$opts='php') {

    if (is_array($opts)) $opts['depth']++;
    else {
        if (!is_string($opts)) {
            $in = $opts;
            $opts = is_integer($in) ? "json" : 'php';
            if ($in) $opts .= " pretty print";

        }
        $args = preg_split('/[^a-z0-9]/i', $opts);
        if (in_array('json', $args))
             $opts = array('open'=>'{','close'=>'}','sep'=>': ', 'integers'=>false);
        else $opts = array('open'=>'[','close'=>']','sep'=>' => ','integers'=>true);
        if (!in_array('pretty', $args)) $opts = $opts + array('indent'=>'','eol'=>'');
        else $opts = $opts + array('indent'=>'  ','eol'=>"\n" );
        $opts['depth'] = 1; #starts at 1
        $opts['print'] = in_array('print', $args) || in_array('echo', $args) ? true:false;
    }
    end($arr); $last = key($arr);
    $result = "$opts[open]$opts[eol]";

    foreach($arr as $k=>$v){
        $result .= str_repeat($opts['indent'],$opts['depth']);
        if (!$opts['integers']) $result .= "\"$k\"$opts[sep]";
        else $result .= is_integer($k) ? " $k$opts[sep]" : "\"$k\"$opts[sep]";
        if    (is_array($v))   $result .= array_string($v,$opts);
        elseif(is_bool($v))    $result .= $v ? "true":"false";
        elseif(is_numeric($v)) $result .= $v;
        else                   $result .= "\"".addslashes($v)."\"";
        $result .= $last===$k ? $opts['eol'] : ", $opts[eol]";
    }
    $opts['depth']--;
    $result .= str_repeat($opts['indent'],$opts['depth']).$opts['close'];
    if ($opts['depth']===0) {
        $result .= $opts['eol'];
        if ($opts['print']) echo $result;
    }
    return $result;
}

$arr = array(
    "one"=>true,
    "two",
    "subarray"=>array(
        array(
            "string"=>"yo",
            "float"=>1234.0000
        ),
        array(
            'a string',
            "time"=>6.022e23
        )
    )
);
array_string($arr, 'json print');
array_string($arr, 'json pretty print');

echo "no output...\n";
array_string($arr, 'json pretty');
array_string($arr, 'json');
array_string($arr, 'php pretty');
array_string($arr, 'php');
echo "end no output...\n";

array_string($arr, 'php print');
array_string($arr, 'php print print');

echo "no output...\n";
array_string($arr, 'php pretty');
array_string($arr, 'php');
array_string($arr, 'php pretty');
array_string($arr, 'php');
echo "end no output...\n";