<?php
// 1:
$apple = array(
    "foo" => "bar",
    "bar" => "foo",
);
echo "1:\n\$apple contains ";
var_dump($apple);
echo "\n";

// 2:
// as of PHP 5.4
$orange = [
    "foo" => "bar",
    "bar" => "foo",
];
echo "2:\n\$orange contains ";
var_dump($orange);
echo "\n";
// 3:
$pluto = array(
    1    => "a",
    "1"  => "b",
    1.5  => "c",
    true => "d",
    false => 34
);
echo "3:\n\$pluto contains ";
var_dump($pluto);
echo "\n";
// 4:
$pippo = array(
    "foo" => "bar",
    "bar" => "foo",
    100   => -100,
    -100  => 100,
);
echo "4:\n\$pippo contains ";
var_dump($pippo);
echo "\n";
// 5:
$paperino = array(
         "a",
         "b",
    6 => "c",
    4 => "d",
         "e"
);
echo "5:\n\$paperino contains ";
var_dump($paperino);
echo "\n";
// 6:
$strange_multiarray = array(
    "foo" => "bar",
    42    => 24,
    "multi" => array(
         "dimensional" => array(
             "array" => "foo"
         )
    )
);
echo "5:\n\$strange_multiarray contains ";
var_dump($strange_multiarray);
echo "\nand each element of the array \$strange_multiarray can be accessed with the 'array[key]' syntax expression.\n";
var_dump($strange_multiarray["foo"]);
var_dump($strange_multiarray[42]);
var_dump($strange_multiarray["multi"]);
var_dump($strange_multiarray["multi"]["dimensional"]);
var_dump($strange_multiarray["multi"]["dimensional"]["array"]);
?>