PHP Form Handling Guide

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 Guide

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