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isset

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#isset の使い方

・変数が宣言されていること、そして NULL とは異なることを検査する.

##基本的な使い方
こんな感じでisset(検査したいパラメータ)をいれる。

if (isset($var)) {
    echo "This var is set so I will print.";
}

##チェックできること
・変数がセットされているか否か
・複数値が入力されている場合、全て変数がセットされていないとFALSEが返される。

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