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備忘録~今日学んだ配列関係の変数まとめ~

Posted at
array_slice — 配列の一部を切り取る。
array_slice(array $array,int $offset,?int $length = null)
$input = array("a", "b", "c", "d", "e");

$output = array_slice($input, 2);      // "c", "d", "e" を返す。
$output = array_slice($input, -2, 1);  // "d" を返す。
$output = array_slice($input, 1,3); // "b", "c", "d" を返す。
$output = array_slice($input, 0, 3);   // "a", "b", "c" を返す。
array_chunk - 配列を分割する。

<?php
$input_array = array('a', 'b', 'c', 'd', 'e');
print_r(array_chunk($input_array, 2));
print_r(array_chunk($input_array, 2, true));
?>
//
Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )
    [1] => Array
        (
            [0] => c
            [1] => d
        )
    [2] => Array
        (
            [0] => e
        )
)

Array
(
    [0] => Array
        (
            [0] => a
            [1] => b
        )
    [1] => Array
        (
            [2] => c
            [3] => d
        )
    [2] => Array
        (
            [4] => e
        )
)
array_key_exists -配列から指定のキーがあるか探す。
array_key_exists($key, $array); arrayの中にkeyがあればtrue、無ければfalseを返す。
array_merge - ひとつまたは複数の配列をくっつける。
$array1 = array("color" => "red", 2, 4);
$array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
$result = array_merge($array1, $array2);
print_r($result);
?>
array_sum - 配列の値を足し合わせる。
array_sum($array);
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