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PHP7でメソッド(関数)を戻り値指定にしてみる

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PHP7になって型宣言(タイプヒンティング)が変更になり戻り値(返し値)の型を指定できるようになりました。
PHP5.6以前は引数のみしか指定できず、型はarray、クラス型のみのでした。
こんな感じで書けます。

<?php
function sum($a, $b): float {
    return $a + $b;
}

// 戻り値が float
var_dump(sum(1, 2));
?>

出力結果
float(3)

こんな感じでも使えますし、
PHP的な戻り値の型がまぜこぜになってるやつでも、

<?php
function kansu($hoge):int {
    if ($hoge == 1) {
        return 9243;
    }
    return "あああ";
}
var_dump(kansu(1));//成功出力int(9243)

var_dump(kansu(2));//エラー
?>

ぜひ使ってみましょう。

fgnhssb
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