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                ## 一、概述 PHP 中的 $_GET 和 $_POST 變量用于檢索表單中的信息,比如用戶輸入。 分別對應了GET和POST兩種傳輸數據的方式; 1. 預定義的 $\_GET 變量用于收集來自 method="get" 的表單中的值。 2. 在 PHP 中,預定義的 $\_POST 變量用于收集來自 method="post" 的表單中的值。 ~~~ $_SERVER["PHP_SELF"] 什么是 $_SERVER["PHP_SELF"] 變量?$_SERVER["PHP_SELF"]是超級全局變量,返回當前正在執行腳本的文件名,與 document root相關。 ~~~ ## 二、驗證 針對表單字段,執行驗證; 舉例: ~~~ <?php // 定義變量并默認設為空值 $nameErr = $emailErr = $genderErr = $websiteErr = ""; $name = $email = $gender = $comment = $website = ""; if ($_SERVER["REQUEST_METHOD"] == "POST") { if (empty($_POST["name"])) { $nameErr = "名字是必需的。"; } else { $name = test_input($_POST["name"]); } if (empty($_POST["email"])) { $emailErr = "郵箱是必需的。"; } else { $email = test_input($_POST["email"]); } if (empty($_POST["website"])) { $website = ""; } else { $website = test_input($_POST["website"]); } if (empty($_POST["comment"])) { $comment = ""; } else { $comment = test_input($_POST["comment"]); } if (empty($_POST["gender"])) { $genderErr = "性別是必需的。"; } else { $gender = test_input($_POST["gender"]); } } ?> ~~~
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