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PHP - 驗證 Name, E-mail, 和 URL

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以下是源碼: 

<html><head><style>.error{color:#FF0000;}style>head><body>// define variables and set to empty values$nameErr = $emailErr = $genderErr = $websiteErr = "";$name = $email = $gender = $comment = $website = "";if ($_SERVER["REQUEST_METHOD"] == "POST"){   if (empty($_POST["name"]))     {$nameErr = "Name is required";}   else     {     $name = test_input($_POST["name"]);     // check if name only contains letters and whitespaceif (!preg_match("/^[a-zA-Z ]*$/",$name))       {       $nameErr = "Only letters and white space allowed";        }     }   if (empty($_POST["email"]))     {$emailErr = "Email is required";}   else     {     $email = test_input($_POST["email"]);     // check if e-mail address syntax is validif (!preg_match("/([\w\-]+\@[\w\-]+\.[\w\-]+)/",$email))       {       $emailErr = "Invalid email format";        }     }   if (empty($_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))       {       $websiteErr = "Invalid URL";        }     }   if (empty($_POST["comment"]))     {$comment = "";}   else     {$comment = test_input($_POST["comment"]);}   if (empty($_POST["gender"]))     {$genderErr = "Gender is required";}   else     {$gender = test_input($_POST["gender"]);}}functiontest_input($data){$data = trim($data);     $data = stripslashes($data);     $data = htmlspecialchars($data);     return$data;}?><h2>PHP Form Validation Exampleh2><p><spanclass="error">* required field.span>p><formmethod="post"action="PHP_SELF"]);?>">    Name: <inputtype="text"name="name"><spanclass="error">* echo$nameErr;?>span><br><br>   E-mail: <inputtype="text"name="email"><spanclass="error">* echo$emailErr;?>span><br><br>   Website: <inputtype="text"name="website"><spanclass="error">echo$websiteErr;?>span><br><br>   Comment: <textareaname="comment"rows="5"cols="40">textarea><br><br>   Gender:   <inputtype="radio"name="gender"value="female">Female   <inputtype="radio"name="gender"value="male">Male   <spanclass="error">* echo$genderErr;?>span><br><br><inputtype="submit"name="submit"value="Submit">form>echo"
Your Input:
";echo$name;echo"
";echo$email;echo"
";echo$website;echo"
";echo$comment;echo"
";echo$gender;?>body>html>

以上就介紹了PHP - 驗證 Name, E-mail, 和 URL，包括了方面的內容，希望對PHP教程有興趣的朋友有所協助。

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