如何在 PHP 中循环浏览多维数组

### Answer: Use the PHP nested loop
You can simply use the [foreach loop](http://www.bixiaguangnian.com/manual/php7/3976.html "foreach loop") in combination with the [for loop](http://www.bixiaguangnian.com/manual/php7/3976.html#h2-php-for-loop "for loop") to access and retrieve all the keys, elements or values inside a multidimensional array in PHP.

Let's take a look at the following example to understand how it basically works:

```php
<?php
// Multidimensional array
$superheroes = array(
    "spider-man" => array(
        "name" => "Peter Parker",
        "email" => "peterparker@mail.com",
    ),
    "super-man" => array(
        "name" => "Clark Kent",
        "email" => "clarkkent@mail.com",
    ),
    "iron-man" => array(
        "name" => "Harry Potter",
        "email" => "harrypotter@mail.com",
    )
);
 
// Printing all the keys and values one by one
$keys = array_keys($superheroes);
for($i = 0; $i < count($superheroes); $i++) {
    echo $keys[$i] . "{<br>";
    foreach($superheroes[$keys[$i]] as $key => $value) {
        echo $key . " : " . $value . "<br>";
    }
    echo "}<br>";
}
?>
```