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What are PHP forms for?

藏色散人

Oct 21, 2019 am 09:37 AM

php form

What is the PHP form for?

PHP super global variables $_GET and $_POST are used to collect form data (form-data).

PHP - A simple HTML form

The example below shows a simple HTML form that contains two input fields and a submit button:

Example

<html>
<body>
<form action="welcome.php" method="post">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
<input type="submit">
</form>
</body>
</html>

When the user fills out this form and clicks the submit button, the form data will be sent to a PHP file named "welcome.php" for processing. Form data is sent via the HTTP POST method.

To display the submitted data, you can simply echo all variables. The "welcome.php" file looks like this:

<html>
<body>
Welcome <?php echo $_POST["name"]; ?><br>
Your email address is: <?php echo $_POST["email"]; ?>
</body>
</html>

Output:

Welcome Bill
Your email address is Bill.Gates@example.com

The same result can be obtained using the HTTP GET method:

Example

<html>
<body>
<form action="welcome_get.php" method="get">
Name: <input type="text" name="name"><br>
E-mail: <input type="text" name="email"><br>
<input type="submit">
</form>
</body>
</html>

"welcome_get.php" is like this:

<html>
<body>
Welcome <?php echo $_GET["name"]; ?><br>
Your email address is: <?php echo $_GET["email"]; ?>
</body>
</html>

The above code is very simple. However, the most important part was left out. You need to validate your form data to prevent vulnerabilities in your scripts.

Note: Please pay attention to security when processing PHP forms!

This page does not contain any form validators, it only shows us how to send and receive form data.

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