PHP入門 配列(array) 基本編 ref: http://qiita.com/items/b63fb1797aa1be0b3cd0

file0.txt

$array = array(1, 2, 3, 4, 5);

file1.txt

print_r($array);

file2.txt

Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )

file3.txt

Array (
    [0] => 1
    [1] => 2
    [2] => 3
    [3] => 4
    [4] => 5
)

file4.txt

$array[インデックス番号]

file5.txt

$array = array('first' => 1, 2, 3, 4, 'final' => 5);

file6.txt

Array (
    [first] => 1
    [0] => 2
    [1] => 3
    [2] => 4
    [final] => 5
)

file7.txt

$array[キー]