PHP Form Handling

Sri Lanka-German Training InstituteDepartment of Information and Communication Technology
National Diploma in Information and Communication Technology
PHP :2-FORM-HANDLING>
K72C001M07 - Web Programming
11/23/2018 2-FORM-HANDLING 1

HTML Form
//login.html
<html>
<body>
<form action="login_get.php" method=“get">
Username: <input type="text" name="userName"><br>
Password: <input type="text" name="password"><br>
<input type="submit">
</form>
</body>
</html>

When to use GET?
• Information sent from a form with the GET method is visible to
everyone .
• All variable names and values are displayed in the URL.
• GET also has limits on the amount of information to send.
• The limitation is about 2000 characters.
• The variables are displayed in the URL, it is possible to bookmark the
page.
• This can be useful in some cases.
• GET may be used for sending non-sensitive data.
• Note: GET should NEVER be used for sending passwords or other
sensitive information!

HTTP GET method
//login_get.php
Welcome <?php echo $_GET["userName"]; ?>
<br> Your Password is: <?php echo
$_GET["password"];?>

When to use POST?
• Information sent from a form with the POST method is invisible to
others.
• All names/values are embedded within the body of the HTTP
request.
• No limits on the amount of information to send.
• Supports advanced functionality such as support for multi-part binary
input while uploading files to server.
• It is not possible to bookmark the page.
• Developers prefer POST for sending form data.

HTTP POST method
//login_post.php
Welcome <?php echo $_POST["userName"]; ?><br>
Your Password is: <?php echo
$_POST["password"];?>

Exercise (1): Form – Sign up
• Write a program to display entered details of following interface
• Method = POST
Last Name
First Name
E-mail
Password
Conform Password
Sign up

Exercise (2): Form – Sign in
• Write a program to check user name and password correct or not.
• Give message successfully login or unauthorized access.
• Use your own user name and password
• Login.html
• Login.php
User Name
Password
Sign in

Exercise (2): Answer
• Login.html
<html>
<body>
<h1>Login Form</h1>
<form method="POST" action=“Login.php">
<p> Name </p> <input type="text" name="name" size=20
/>
<p> Password </p> <input type="password" name="pass"
size=20 />
<input type="submit" name="login" value="login" />
</form>
</body>
</html

Exercise (2): Answer
• Login.php
<?php
if(($_POST['name']=="user") &&
($_POST['pass']=="pass"))
echo "<h1> Hello ".$_POST['name']."</h1>";
else
echo "<h2> Access Denied </h2>";
?>

isset( $var)
• Returns TRUE if var exists and has value other than NULL. FALSE
otherwise.
$var = '';
// This will evaluate to TRUE so the text will
be printed.
if (isset($var)) {
echo "This var is set so I will print.";
}
$a = "test";
$b = "anothertest";
var_dump(isset($a)); // TRUE

Get Values of Checked Checkboxes
• Example: checkbox.php
<h2>Select your technical exaposer:</h2>
<form action="#" method="post">
<input type="checkbox" name="check_list[]"
value="C/C++"><label>C/C++</label><br/>
value="Java"><label>Java</label><br/>
value="PHP"><label>PHP</label><br/>
<input type="submit" name="submit"
value="Submit"/>
</form>

Get Values of Checked Checkboxes
• Example: checkbox.php
<?php
if(isset($_POST['submit'])){
if(!empty($_POST['check_list'])){
foreach($_POST['check_list'] as $selected){
echo $selected."</br>";
}}}
?>

Get Value of Select Option - single
• Example: select_option.php
<select name="Color">
<option value="Red">Red</option>
<option value="Green">Green</option>
<option value="Blue">Blue</option>
<option value="Pink">Pink</option>
<option value="Yellow">Yellow</option>
</select>
<input type="submit" name="submit" value="Get
Selected Values" />
</form>

Get Value of Select Option - single
• Example: select_option.php
<?php
$selected_val = $_POST['Color'];
echo "You have selected :" . $selected_val;
}
?>

Get Value of Select Option - multiple
• Example: select_option_multiple.php
<select name="Color[]" multiple>
<option value="Red">Red</option>
<option value="Green">Green</option>
<option value="Blue">Blue</option>
<option value="Pink">Pink</option>
<option value="Yellow">Yellow</option>
</select>
<input type="submit" name="submit" value="Get
Selected Values" />
</form>

Get Value of Select Option - multiple
• Example: select_option_multiple.php
<?php
foreach ($_POST['Color'] as $select)
{
echo "You have selected : $select <br/>";
}
}
?>

Required Fields
• Example: signup.php
<html>
<head>
<title>Sign-Up</title>
<style>
body {
margin: auto;
width: 500px;
}
div {
padding: 10px;
}
div span {
color: red;
}
</style>
</head>

Required Fields
<body>
<h3>Registration Form</h3>
<?php
$nameErr = $userNameErr = $passwordErr =
$cpasswordErr= "";
$fullname = $email = $userName = $gender =
$password = $cpassword = null;
if (empty($_POST["name"])) {

Required Fields
$nameErr = "Name is required";
} else {
$fullname = $_POST['name'];
}
if (empty($_POST["user"])) {
$userNameErr = "Username is
required";
} else {
$userName = $_POST['user'];
}

Required Fields
if (empty($_POST["pass"])) {
$passwordErr = "Password is
required";
} else {
$password = $_POST['pass'];
}
$email = $_POST['email'];
$gender = $_POST['gender'];

Required Fields
$cpassword = $_POST['cpass'];
}
?>
<form method="POST" action="#">
<div>Name<input type="text" name="name"
/><span>*<?php echo $nameErr; ?></span></div>
<div>Email <input type="text"
name="email"></div>
<div>Gender:
<input type="radio" name="gender"
value="Female" checked>Female
<input type="radio" name="gender"
value="Male">Male</div>

Required Fields
<div>UserName <input type="text"
name="user"><span>*<?php echo $userNameErr;
?></span></div>
<div>Password <input type="password"
name="pass"><span>*<?php echo $passwordErr;
?></span></div>
<div>Confirm Password<input type="password"
name="cpass"></div>
<div><input id="button" type="submit"
name="submit" value="Sign-Up"></div>
</form>
<?php
echo'
<div>Name : '.$fullname.'</div>

Required Fields
<div>Email : '.$email.' </div>
<div>UserName : '.$userName.' </div>
<div>Gender : '.$gender.' </div>
<div>Password : '.$password.' </div>
<div>Confirm Password :
'.$cpassword.'</div>
';
?>
</body>
</html>

Reference
www.w3schools.com
www.php.net
Friday, November 23, 2018 25

PHP Form Handling

More Related Content

Similar to PHP Form Handling (20)

More from Achchuthan Yogarajah (10)

Recently uploaded (20)

PHP Form Handling