PHP: Multi Dimensional Array Iterator

mda.php

<?php
// a multidimensional array
$arr = [
    ["sitepoint", "phpmaster"],
    ["buildmobile", "rubysource"],
    ["designfestival", "cloudspring"],
    "not an array"
];

// loop through the object
foreach ($arr as $key => $value) {
    // check for arrays
    if (is_array($value)) {
        foreach ($value as $k => $v) {
            echo $k . ": " . $v . "<br>";
        }
    }
    else {
        echo $key . ": " . $value . "<br>";
    }
}