案例:PHP案例     状态:不可编辑再运行    进入横版
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<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
 
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<!DOCTYPE HTML> 
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<html>
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<head>
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<style>
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.error {color: #FF0000;}
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</style>
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</head>
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<body> 
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<?php
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// 定义变量并设置为空值
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$nameErr = $emailErr = $genderErr = $websiteErr = "";
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$name = $email = $gender = $comment = $website = "";
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if ($_SERVER["REQUEST_METHOD"] == "POST") {
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   if (empty($_POST["name"])) {
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     $nameErr = "姓名是必填的";
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   } else {
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     $name = test_input($_POST["name"]);
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   }
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   if (empty($_POST["email"])) {
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     $emailErr = "电邮是必填的";

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