PHP 4 to 10

Program 4 Read form data

<!DOCTYPE html>

<html>

<head>

<style>

#field-container { width: 300px; margin: 50px auto; }

input, select, textarea { width: 100%; padding: 5px; margin-top: 2px; box-sizing: border-box; }

</style>

</head>

<body>

<h2>Reading Form Data</h2>

<?php

if ($_SERVER["REQUEST_METHOD"] == "POST") {

$name = $_POST['name'];

$gender = $_POST['gender'];

$hobbies = isset($_POST['hobbies']) ? implode(', ', $_POST['hobbies']) : 'None';

$comments = $_POST['comments'];

$branch = $_POST['branch'];

echo "<h3>Submitted Data:</h3> Name: $name<br>Gender: $gender<br>Branch:

$branch<br>Hobbies: $hobbies<br>Comments: $comments<br>";

} else {?>

<label>Gender:</label><br>

<input type="radio" name="gender" value="Male" required> Male

<input type="radio" name="gender" value="Female" required> Female<br><br>

<label>Branch:</label><select name="branch" required>

<option value="Computer Science">Computer Science</option>

<option value="Electronics">Electronics</option>

<option value="Mechanical">Mechanical</option>

<option value="Civil">Civil</option>

</select><br><br>

<label>Hobbies:</label><br>

<input type="checkbox" name="hobbies[]" value="Reading"> Reading

<input type="checkbox" name="hobbies[]" value="Sports"> Sports

<input type="checkbox" name="hobbies[]" value="Music"> Music<br><br>

<label>Comments:</label><textarea name="comments" rows="3"></textarea><br><br>

</form>

<?php } ?>

</div>

</body>

</html>

program 5 METHOD OVERLOADING, OVERRIDING

<?php

class Shape {

public function draw() {

echo "Calculating the area of a generic shape.<br>";

}

class CircleRectangle extends Shape {

public function draw() {

echo "<h2>Method Overloading and Overriding</h2>";

echo "<h3>Calculating the area of Circle and Rectangle</h3><br>";

}

public function __call($name, $arguments) {

if ($name == 'area') {

if (count($arguments) == 1) {

// Area of circle

$radius = $arguments[0];

$area = pi() * $radius * $radius;

echo "<b>Area of circle</b> with radius $radius is $area.<br><br>";

} elseif (count($arguments) == 2) {

// Area of rectangle

$length = $arguments[0];

$width = $arguments[1];

$area = $length * $width;

echo "<b>Area of rectangle </b>with length $length and width $width is $area.<br><br>";

} else {

echo "Invalid number of arguments for area.<br><br>";

}

} else {

echo "Method '$name' not found.<br><br>";

}

$shape = new CircleRectangle();

$shape->draw();

$shape->area(5);

$shape->area(10, 4);

$shape->area();

$shape->perimeter(5);

Program 6 INHERITANCE

<?php

class Employee {

public $name;

public $position;

public $salary;

public function __construct($name, $position, $salary) {

$this->name = $name;

$this->position = $position;

$this->salary = $salary;

}

public function displayDetails() {

echo "<b>Employee Name : </b>" . $this->name . "<br><br>";

echo "<b>Position : </b>" . $this->position . "<br><br>";

echo "<b>Salary : </b>" . $this->salary . "<br><br>";

}

class Manager extends Employee {

public $department;

public function __construct($name, $position, $salary, $department) {

parent::__construct($name, $position, $salary);

$this->department = $department;

}

public function displayDetails() {

parent::displayDetails();

echo "<b>Department : </b>" . $this->department . "<br><br><br><br>";

}

class Developer extends Employee {

public $programmingLanguage;

public function __construct($name, $position, $salary, $programmingLanguage) {

parent::__construct($name, $position, $salary);

$this->programmingLanguage = $programmingLanguage;

}

public function displayDetails() {

parent::displayDetails();

echo "<b>Programming Language : </b>" . $this->programmingLanguage . "<br><br>";

}

echo "<h2>Employee Details using Inheritance</h2>";

// Create Manager object

$manager = new Manager("Raja", "Senior Manager", 80000, "Sales");

$manager->displayDetails();

// Create Developer object

$developer = new Developer("Kumar", "Software Developer", 60000, "PHP");

$developer->displayDetails();

7. File handling

<!DOCTYPE html>

<head>

<title>Document</title>

</head>

<body>

<?php

$filename = "college.txt";

file_put_contents($filename, "Department of Computer Science.\nKGiSL Institute of Information

Management.\n");

echo "File written successfully.<br><br>";

echo "<b>Reading file contents:</b><br>";

echo nl2br(file_get_contents($filename));

file_put_contents($filename, "Saravanampatti.\n", FILE_APPEND); echo "<br>Content appended

successfully.<br><br>";

echo "<b>Updated file contents:</b><br>";

echo nl2br(file_get_contents($filename));

</body>

</html>

9. IMPLEMENT COOKIES

<?php

$action = $_GET['action'] ?? '';

// Logout section

if ($action == 'logout') {

setcookie('username', '',

time() - 3600, '/');

header("Location:

program9.php");

exit();

}

// Login form submission

($_SERVER['REQUEST_ME

THOD'] == 'POST') {

$username =

trim($_POST['username']);

if (!empty($username)) {

setcookie('username',

$username, time() + 3600, '/');

// valid for 1 hour

header("Location:

program9.php");

exit();

} else {

$error = "Please enter a

username.";

}

// If cookie exists, show

welcome message

(isset($_COOKIE['username'])

) {

$username =

htmlspecialchars($_COOKIE['

username']);

echo "<h2>Welcome,

$username!</h2>";

echo "<p>Cookie is set and

you are logged in.</p>";

echo "<a

href='?action=logout'>Logout<

/a>";

exit();

}

<!DOCTYPE html>

<html>

<head>

<title>Cookies</title>

</head>

<body>

<h2>Login Form</h2>

<?php if (!empty($error))

echo "<p

style='color:red;'>$error</p>";

<form method="post"

action="">

<label>Enter

Username:</label>

<input type="text"

name="username" required>

<input type="submit"

value="Login">

</form>

</body>

</html>

10. DRAWING IMAGE ON A webpage

<?php

$width = 400;

$height = 600;

$image = imagecreatetruecolor($width, $height);

$background_color = imagecolorallocate($image,0, 0, 255);

$image_body_color = imagecolorallocate($image, 255, 165, 0);

$window_color = imagecolorallocate($image, 100, 200, 255);

$flame_color = imagecolorallocate($image, 255, 0, 0);

$triangle_color = imagecolorallocate($image, 0, 255, 0);

$square_color = imagecolorallocate($image, 255, 255, 255);

imagefill($image, 0, 0, $background_color);

imagefilledpolygon($image, array(

150, 200,

200, 90,

250, 200

), 3, $flame_color);

imagefilledrectangle($image, 150, 201, 250, 400, $image_body_color);

imagefilledellipse($image, 200 , 250, 40, 40, $window_color);

imagefilledrectangle($image, 190, 240, 210, 260, $square_color );

imagefilledellipse($image, 200 , 350, 40, 40, $window_color);

imagefilledrectangle($image, 190, 340, 210, 360, $square_color );

imagefilledpolygon($image, array(250, 380, 350, 380, 250, 300 ), 3, $triangle_color);

imagefilledpolygon($image, array(60, 380, 150, 380, 150, 300 ),3, $triangle_color);

imagefilledpolygon($image, array(150, 430,170, 400,190, 430), 3, $triangle_color);

imagefilledpolygon($image, array(210, 430,230, 400,250, 430), 3, $triangle_color);

header("Content-Type: image/png");

imagepng($image);

imagedestroy($image);

8 .CRUD Operations

<?php

$servername = "localhost";

$username = "root";

$password = "";

$database = "student";

$conn = mysqli_connect($servername, $username, $password, $database);

if (!$conn) {

die("Connection failed: " . mysqli_connect_error());

}

// Insert Record

if (isset($_POST["submit1"])) {

// Check that all required fields are filled

if (!empty($_POST["StudentName"]) && !empty($_POST["StudentId"]) &&

!empty($_POST["Department"]) && !empty($_POST["Year"])) {

$studentId = $_POST["StudentId"];

$studentName = $_POST["StudentName"];

$department = $_POST["Department"];

$year = $_POST["Year"];

// Check if the Student ID already exists

$checkQuery = "SELECT * FROM studentdetails WHERE StudentId = '$studentId'";

$checkResult = mysqli_query($conn, $checkQuery);

if (mysqli_num_rows($checkResult) > 0) {

echo "<b style='color:red;'> Student ID '$studentId' already exists. </b><br>";

} else {

// If not exists, insert new record

$insertQuery = "INSERT INTO studentdetails (StudentName, StudentId, Department, Year)

VALUES ('$studentName', '$studentId', '$department', '$year')";

if (mysqli_query($conn, $insertQuery)) {

echo "<b style='color:green;'>Record inserted successfully.</b><br>";

} else {

echo "Error inserting record: " . mysqli_error($conn) . "<br>";

}

} else {

echo "All fields are required for insertion.<br>";

}

// Update Record

if (isset($_POST["submit4"])) {

$name = $_POST["StudentName"];

$id = $_POST["StudentId"];

$dept = $_POST["Department"];

$year = $_POST["Year"];

if (!empty($id_to_update) && !empty($new_firstname) && !empty($new_lastname) &&

!empty($new_age)) {

$sql = "UPDATE studentdetails

SET StudentName='$name', Department='$dept', Year='$year'

WHERE StudentId='$id'";

$result = mysqli_query($conn, $sql);

if ($result) {

if (mysqli_affected_rows($conn) > 0) {

echo "<p style='color:green;'>Record updated successfully for Student ID: $id.</p>";

} else {

echo "<p style='color:red;'>No record found with Student ID: $id.</p>";

}

} else {

echo "<p style='color:red;'>Error updating record: " . mysqli_error($conn) . "</p>";

}

} else {

echo "<p style='color:red;'>All Fields are required for update.</p>";

}

// Delete Record

if (isset($_POST["submit2"])) {

$studentId = $_POST["StudentId"];

if (empty($studentId)) {

echo "<p style='color:red;'>Student ID is required for deletion.</p>";

} else {

$sql = "DELETE FROM studentdetails WHERE StudentId='$studentId'";

$result = mysqli_query($conn, $sql);

if ($result) {

if (mysqli_affected_rows($conn) > 0) {

echo "<p style='color:green;'>Record deleted successfully.</p>";

} else {

echo "<p style='color:red;'>No record found with Student ID: $studentId.</p>";

}

} else {

echo "<p style='color:red;'>Error deleting record: " . mysqli_error($conn) . "</p>";

}

// Display Records

if (isset($_POST["submit3"])) {

$sql = "SELECT * FROM studentdetails ORDER BY StudentId ASC";

$res = mysqli_query($conn, $sql);

if (mysqli_num_rows($res) > 0) {

echo "<center><h2>Student Records</h2>";

echo "<table border='1' cellspacing='0' cellpadding='8'>";

echo "<tr style='background-color:#f2f2f2;'>

<th>Student Name</th>

<th>Student ID</th>

<th>Department</th>

</tr>";

while ($row = mysqli_fetch_assoc($res)) {

echo "<tr>

<td>" . $row["StudentName"] . "</td>

<td>" . $row["StudentId"] . "</td>

<td>" . $row["Department"] . "</td>

</tr>";

}

echo "</table></center>";

} else {

echo "<p style='color:red;'>No records found in the database.</p>";

}

mysqli_close($conn);

<html>

<head>

<title>Student Database Management</title>

</head>

<body>

<h1>STUDENT DETAILS MANAGEMENT</h1>

<table>

<tr>

<td>Student Name</td>

</tr>

<tr>

<td>Student ID</td>

</tr>

<tr>

<td>Department</td>

</tr>

<tr>

</tr>

<tr>

</td>

</tr>

</table>

</form>

</center>

</body>

</html>

Crud Operations

<?php

$server = "localhost";

$port = "3306";

$user = "root";

$pass = "";

$db = "students";

// Connect to MySQL (without DB first)

$conn = mysqli_connect($server, $user, $pass, "", $port);

if (!$conn) {

die("❌ Not connected to MySQL");

} else {

echo "✅ Connected successfully<br>";

}

// Create database if not exists

$query = "CREATE DATABASE IF NOT EXISTS $db";

if (mysqli_query($conn, $query)) {

echo "✅ Database '$db' created successfully<br>";

}

// Connect with database

$con = mysqli_connect($server, $user, $pass, $db);

// Create table if not exists

$cquery = "CREATE TABLE IF NOT EXISTS student(

id INT AUTO_INCREMENT PRIMARY KEY,

name VARCHAR(20),

age INT,

department VARCHAR(20)

)";

if (mysqli_query($con, $cquery)) {

echo "✅ Table 'student' ready<br><br>";

} else {

echo "❌ Table creation failed: " . mysqli_error($con);

}

// INSERT

if (isset($_POST['insert'])) {

$name = $_POST['name'];

$age = $_POST['age'];

$depart = $_POST['depart'];

$iquery = "INSERT INTO student(name, age, department) VALUES('$name', $age, '$depart')";

mysqli_query($con, $iquery);

echo "✅ Record inserted<br>";

}

// UPDATE

if (isset($_POST['update'])) {

$id = $_POST['id'];

$name = $_POST['name'];

$age = $_POST['age'];

$department = $_POST['depart'];

$uquery = "UPDATE student SET name='$name', age=$age, department='$department' WHERE id=$id";

mysqli_query($con, $uquery);

echo "✅ Record updated<br>";

}

// DELETE

if (isset($_POST['delete'])) {

$id = $_POST['id'];

$dquery = "DELETE FROM student WHERE id=$id";

mysqli_query($con, $dquery);

echo "✅ Record deleted<br>";

}

// Display table

$squery = "SELECT * FROM student";

$results = mysqli_query($con, $squery);

echo "<table border='2' cellpadding='5'>

<tr><th>ID</th><th>Name</th><th>Age</th><th>Department</th></tr>";

foreach ($results as $result) {

echo "<tr>";

echo "<td>" . $result['id'] . "</td>";

echo "<td>" . $result['name'] . "</td>";

echo "<td>" . $result['age'] . "</td>";

echo "<td>" . $result['department'] . "</td>";

echo "</tr>";

}

echo "</table>";

mysqli_close($con);

<!DOCTYPE html>

<head>

<title>Student CRUD</title>

</head>

<body>

<h2>Student Data Form</h2>

<label for="depart">Department</label>

</form>

</body>

</html>

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