php完整表单验证实例

<!DOCTYPE HTML>
<html>
<head>
<style>
.error{color:#FF0000}
</style>
</head>
<body>
<?php
	$nameErr=$emailErr=$genderErr=$websiteErr="";
	$name=$email=$comment=$gender=$website="";
	if($_SERVER["REQUEST_METHOD"]=="POST")
	{
		if(empty($_POST["name"]))
		{
			$nameErr="用户名是必须的";
		}
		else
		{
			$name=test_input($_POST["name"]);
			if(!preg_match("/^[a-zA-Z ]*$/",$name))
			{
				$nameErr="用户名只能为数字和空格";
			}
		}
		if (empty($_POST["email"]))
		{
			$emailErr = "邮箱是必填的";
		}
		else
		{
			$email = test_input($_POST["email"]);
			// check if e-mail address syntax is valid
			if (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))
			{
				$emailErr = "不是邮箱格式"; 
			}
		}
     
		if (empty($_POST["website"]))
		{
			$website = "";
		}
		else
		{
			$website = test_input($_POST["website"]);
			// check if URL address syntax is valid (this regular expression also allows dashes in the URL)
			if (!preg_match("/\b(?:(?:https?|ftp):\/\/|www\.)[-a-z0-9+&@#\/%?=~_|!:,.;]*[-a-z0-9+&@#\/%=~_|]/i",$website))
			{
				$websiteErr = "不是url"; 
			}
		}

		if (empty($_POST["comment"]))
		{
			$comment = "";
		}
		else
		{
			$comment = test_input($_POST["comment"]);
		}

		if (empty($_POST["gender"]))
		{
			$genderErr = "性别是必须的";
		}
		else
		{
			$gender = test_input($_POST["gender"]);
		}

	}
	function test_input($data)
	{
		$data=$trim($data);
		$data=$stripslashes($data);
		$data=$htmlspecialchars($data);
		return $data;
	}
?>
<h2>php表单验证实例</h2>
<p><span class="error"> * 必须输入的</span></p>
<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]);?>"> 
   Name: <input type="text" name="name" value="<?php echo $name;?>">
   <span class="error">* <?php echo $nameErr;?></span>
   <br><br>
   E-mail: <input type="text" name="email" value="<?php echo $email;?>">
   <span class="error">* <?php echo $emailErr;?></span>
   <br><br>
   Website: <input type="text" name="website" value="<?php echo $website;?>">
   <span class="error"><?php echo $websiteErr;?></span>
   <br><br>
   Comment: <textarea name="comment" rows="5" cols="40"><?php echo $comment;?></textarea>
   <br><br>
   Gender:
   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="female") echo "checked";?>  value="female">Female
   <input type="radio" name="gender" <?php if (isset($gender) && $gender=="male") echo "checked";?>  value="male">Male
   <span class="error">* <?php echo $genderErr;?></span>
   <br><br>
   <input type="submit" name="submit" value="Submit"> 
</form>

<?php
echo "<h2>Your Input:</h2>";
echo $name;
echo "<br>";
echo $email;
echo "<br>";
echo $website;
echo "<br>";
echo $comment;
echo "<br>";
echo $gender;
?>

</body>
</html>
php完整表单验证实例

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