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<?php // 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 whitespace if (!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 valid if (!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($_POST["gender"]);} } function test_input($data) { $data = trim($data); $data = stripslashes($data); $data = htmlspecialchars($data); return $data; } ?> <h2>PHP Form Validation Example</h2> <p><span class="error">* required field.</span></p> <form method="post" action="<?php echo htmlspecialchars($_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; ?>
Output for 5.3.0 - 7.1.0
Notice: Undefined index: REQUEST_METHOD in /in/4nkpO on line 6 <h2>PHP Form Validation Example</h2> <p><span class="error">* required field.</span></p> <form method="post" action="/in/4nkpO"> Name: <input type="text" name="name" value=""> <span class="error">* </span> <br><br> E-mail: <input type="text" name="email" value=""> <span class="error">* </span> <br><br> Website: <input type="text" name="website" value=""> <span class="error"></span> <br><br> Comment: <textarea name="comment" rows="5" cols="40"></textarea> <br><br> Gender: <input type="radio" name="gender" value="female">Female <input type="radio" name="gender" value="male">Male <span class="error">* </span> <br><br> <input type="submit" name="submit" value="Submit"> </form> <h2>Your Input:</h2><br><br><br><br>
Output for 5.2.3 - 5.2.17
Notice: Undefined index: REQUEST_METHOD in /in/4nkpO on line 6 <h2>PHP Form Validation Example</h2> <p><span class="error">* required field.</span></p> <form method="post" action="/in/4nkpO"> Name: <input type="text" name="name" value=""> <span class="error">* </span> <br><br> E-mail: <input type="text" name="email" value=""> <span class="error">* </span> <br><br> Website: <input type="text" name="website" value=""> <span class="error"></span> <br><br> Comment: <textarea name="comment" rows="5" cols="40"></textarea> <br><br> Gender: <input type="radio" name="gender" value="female">Female <input type="radio" name="gender" value="male">Male <span class="error">* </span> <br><br> <input type="submit" name="submit" value="Submit"> </form> <h2>Your Input:</h2><br><br><br><br>
Output for 4.3.0 - 5.2.2
Notice: Undefined index: REQUEST_METHOD in /in/4nkpO on line 6 <h2>PHP Form Validation Example</h2> <p><span class="error">* required field.</span></p> <form method="post" action=""> Name: <input type="text" name="name" value=""> <span class="error">* </span> <br><br> E-mail: <input type="text" name="email" value=""> <span class="error">* </span> <br><br> Website: <input type="text" name="website" value=""> <span class="error"></span> <br><br> Comment: <textarea name="comment" rows="5" cols="40"></textarea> <br><br> Gender: <input type="radio" name="gender" value="female">Female <input type="radio" name="gender" value="male">Male <span class="error">* </span> <br><br> <input type="submit" name="submit" value="Submit"> </form> <h2>Your Input:</h2><br><br><br><br>