<?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>";
}
?>

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