Handling Form Data
When you build a form in HTML and submit it to a PHP script, the data from each form field is sent to the server. PHP provides special variables called superglobals to access this data. The two most common are $_GET and $_POST.
index.php
123456789101112131415161718192021222324252627282930313233343536373839404142434445<?php // Check if the form has been submitted using GET or POST $method = $_SERVER["REQUEST_METHOD"]; $name = ""; $email = ""; if ($method === "POST") { // Access form fields sent via POST $name = isset($_POST["name"]) ? $_POST["name"] : ""; $email = isset($_POST["email"]) ? $_POST["email"] : ""; } elseif ($method === "GET" && isset($_GET["name"])) { // Access form fields sent via GET $name = isset($_GET["name"]) ? $_GET["name"] : ""; $email = isset($_GET["email"]) ? $_GET["email"] : ""; } ?> <!DOCTYPE html> <html> <head> <title>Handle Form Data</title> </head> <body> <h2>Submit your information</h2> <form method="post" action=""> <label>Name: <input type="text" name="name" /></label><br /> <label>Email: <input type="email" name="email" /></label><br /> <input type="submit" value="Submit via POST" /> </form> <form method="get" action=""> <label>Name: <input type="text" name="name" /></label><br /> <label>Email: <input type="email" name="email" /></label><br /> <input type="submit" value="Submit via GET" /> </form> <?php if ($name || $email): ?> <h3>Form Data Received:</h3> <p>Name: <?php echo htmlspecialchars($name); ?></p> <p>Email: <?php echo htmlspecialchars($email); ?></p> <p>Submitted using: <?php echo $method; ?></p> <?php endif; ?> </body> </html>
Form fields are mapped to PHP variables in the superglobals using the name attribute of each input field. For example, if your form has <input type="text" name="username">, then after submission, you can access the value with $_POST["username"] or $_GET["username"], depending on the form's method.
To safely access form data, always check if the expected key exists in the superglobal array using isset() before using it. This prevents errors if a field is missing; also, use htmlspecialchars() when displaying form data to avoid unwanted HTML being rendered on your page.
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Can you explain the difference between $_GET and $_POST?
How do I choose which method to use for my form?
What happens if I don't set a name attribute on a form field?
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When you build a form in HTML and submit it to a PHP script, the data from each form field is sent to the server. PHP provides special variables called superglobals to access this data. The two most common are $_GET and $_POST.
index.php
123456789101112131415161718192021222324252627282930313233343536373839404142434445<?php // Check if the form has been submitted using GET or POST $method = $_SERVER["REQUEST_METHOD"]; $name = ""; $email = ""; if ($method === "POST") { // Access form fields sent via POST $name = isset($_POST["name"]) ? $_POST["name"] : ""; $email = isset($_POST["email"]) ? $_POST["email"] : ""; } elseif ($method === "GET" && isset($_GET["name"])) { // Access form fields sent via GET $name = isset($_GET["name"]) ? $_GET["name"] : ""; $email = isset($_GET["email"]) ? $_GET["email"] : ""; } ?> <!DOCTYPE html> <html> <head> <title>Handle Form Data</title> </head> <body> <h2>Submit your information</h2> <form method="post" action=""> <label>Name: <input type="text" name="name" /></label><br /> <label>Email: <input type="email" name="email" /></label><br /> <input type="submit" value="Submit via POST" /> </form> <form method="get" action=""> <label>Name: <input type="text" name="name" /></label><br /> <label>Email: <input type="email" name="email" /></label><br /> <input type="submit" value="Submit via GET" /> </form> <?php if ($name || $email): ?> <h3>Form Data Received:</h3> <p>Name: <?php echo htmlspecialchars($name); ?></p> <p>Email: <?php echo htmlspecialchars($email); ?></p> <p>Submitted using: <?php echo $method; ?></p> <?php endif; ?> </body> </html>
Form fields are mapped to PHP variables in the superglobals using the name attribute of each input field. For example, if your form has <input type="text" name="username">, then after submission, you can access the value with $_POST["username"] or $_GET["username"], depending on the form's method.
To safely access form data, always check if the expected key exists in the superglobal array using isset() before using it. This prevents errors if a field is missing; also, use htmlspecialchars() when displaying form data to avoid unwanted HTML being rendered on your page.
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