phpinformationtechnologyphpcodingtopic.pptx

PHP Form Handling, Form
Validation, and Form Required

HTML FORM
Forms are like digital questionnaires on websites, helping collect
information from users. And PHP, a popular web programming language, is
great for making forms work smoothly.
HTML Forms are used to collect user input. They consist of various
elements like text fields, text areas, radio buttons, checkboxes and submit
buttons. Forms can be used to enter shipping address or credit card
information when ordering a product or to receive search engine results.

SAMPLE FORM
<!DOCTYPE HTML>
<html>
<body>
<form>
Username: <input type="text"
name="name"><br>
Password: <input type=“password"
name="password"><br>
<input type="submit">
</form>
</body>
</html>

PHP FORM HANDLING
When using PHP with an HTML form, we specify the URL of the
PHP script in the action attribute of the form tag. The data passed by
the form is then accessed by the target PHP code using PHP's
$_POST or $_GET variables, depending on the value of the form's
action attribute ("get" or "post").
 refers to the process of managing users input through forms on a
web page.
 includes gathering data submitted via the GET or POST methods
and processing it on server side.

GET vs POST Method
GET METHOD
 Data visible in URL
 - Limited to ~2000 characters
 - Suitable for non-sensitive data
 - Can be bookmarked
POST METHOD
 - Data not visible in URL
 - No size limitations
 - Suitable for sensitive data
 - Cannot be bookmarked

GET Method
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-
width, initial-scale=1">
<title></title>
</head>
<body>
<form action="submit.php" method="GET">
NAME:<input type="text" name="user"
required><br>
EMAIL:<input type="email" name="email"
required><br>
LOCATION:<input type="location" name="location"
required><br><br>
</form>
</body>
</html>
<html>
<body>
Welcome: <?php echo $_GET["user"]; ?><br>
Your email address is: <?php echo $_GET["email"]; ?
><br>
Your location is: <?php echo $_GET["location"]; ?>
</body>
</html>

POST Method
<!DOCTYPE html>
<html>
<head>
<title> </title>
</head>
<body>
<form action=”submit.php” action=”post”>
NAME: <input type="text" name="name"><br>
EMAIL: <input type=“email" name=“email"><br>
LOCATION: <input type=“text” name=“location”><br><br>
</form>
</body>
</html>
PHP CODE:
<html>
<body>
Welcome: <?php echo $_POST["user"]; ?><br>
Your email address is: <?php echo $_POST["email"]; ?><br>
Your location is: <?php echo $_POST["location"]; ?>
</body>
</html>

PHP FORM REQUIRED
In PHP, a form is an HTML element used to collect user input.
When discussing "PHP form require," it typically refers to
making certain fields mandatory (or required) in a form.
When a form is submitted, PHP checks if certain fields are
filled out before processing the data. If any required fields are
empty, an error message is displayed, prompting the user to
complete those fields.

Key Elements in PHP Form Require
1. HTML Form Setup
 Fields such as input, textarea, and radio are used to collect data.
 Add an asterisk (*) or similar indicator for required fields.
2. Validation in PHP
 Use the PHP empty() function to check if a field has been left blank.
 If a required field is empty, store an error message in a variable and
display it.

To create required fields in a PHP form, you can use the required attribute in
your HTML input elements. This attribute indicates that the field must be
filled out before the form can be submitted.
<form action="process_form.php" method="post">
<label for="name">Name:</label>
<input type="text" id="name" name="name" required>
<label for="email">Email:</label>
<input type="email" id="email" name="email" required>
<button type="submit">Submit</button>
</form>

STEPS 1: Create the html form
• Define the form structure
<form action="process_form.php" method="post">
</form>
• Use the required attribute
<label for="name">Name:</label>
<input type="text" id="name" name="name" required>
<label for="email">Email:</label>
<input type="email" id="email" name="email" required>

STEP 2: CREATE PHP SCRIPT
• Check for empty fields
<?php
if ($_SERVER["REQUEST_METHOD"] ==
"POST") {
if (empty($_POST["name"])) {
echo "Name is required";
} else {
$name = $_POST["name"];
// Process the name further
}
if (empty($_POST["email"])) {
echo "Email is required";
} else {
$email = $_POST["email"];
// Process the email further
}
}
?>

STEP 3: ENHANCE USER EXPERIENCE
 used asterisk (*) next to required <label for="name">Name
(*):</label>

Benefits of PHP Form Require
• Prevents Missing Data: Ensures all critical fields are
completed.
• Improves User Experience: Provides clear feedback when
fields are left blank.
• Data Integrity: Ensures only valid and complete data is
submitted.

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