diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/10_jquery_animation.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/10_jquery_animation.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/10_jquery_animation.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/10_jquery_animation.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/11_json.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/11_json.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/11_json.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/11_json.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/12_AJAX.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/12_AJAX.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/12_AJAX.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/12_AJAX.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/13_simple.xml b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/13_simple.xml
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/13_simple.xml
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/13_simple.xml
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/14_dtd.xml b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/14_dtd.xml
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/14_dtd.xml
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/14_dtd.xml
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/15_simple-complex.xml b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/15_simple-complex.xml
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/15_simple-complex.xml
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/15_simple-complex.xml
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/16_xslt/books.xml b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/16_xslt/books.xml
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/16_xslt/books.xml
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/16_xslt/books.xml
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/16_xslt/transform.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/16_xslt/transform.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/16_xslt/transform.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/16_xslt/transform.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/16_xslt/transform.xslt b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/16_xslt/transform.xslt
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/16_xslt/transform.xslt
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/16_xslt/transform.xslt
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/1_alert_confirm_popup.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/1_alert_confirm_popup.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/1_alert_confirm_popup.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/1_alert_confirm_popup.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/2_objects.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/2_objects.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/2_objects.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/2_objects.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/3_array.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/3_array.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/3_array.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/3_array.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/4_built_in_objects.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/4_built_in_objects.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/4_built_in_objects.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/4_built_in_objects.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/5_client-side-validation.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/5_client-side-validation.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/5_client-side-validation.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/5_client-side-validation.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/6_handling_events.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/6_handling_events.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/6_handling_events.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/6_handling_events.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/7_try_catch.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/7_try_catch.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/7_try_catch.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/7_try_catch.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/8_jQuery.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/8_jQuery.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/8_jQuery.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/8_jQuery.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/9_jquery_effects.html b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/9_jquery_effects.html
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/9_jquery_effects.html
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/9_jquery_effects.html
diff --git a/5th_Semester/Web_Technology/Lab5 (Javascript & XML)/README.md b/5th_Semester/Web_Technology/Lab3 (Javascript & XML)/README.md
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab5 (Javascript & XML)/README.md
rename to 5th_Semester/Web_Technology/Lab3 (Javascript & XML)/README.md
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/10_form.php b/5th_Semester/Web_Technology/Lab4 (PHP)/10_form.php
new file mode 100644
index 0000000..e3283b8
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/10_form.php	
@@ -0,0 +1,66 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <title>PHP Form</title>
+</head>
+
+<body>
+    <h2>PHP Form Example</h2>
+
+    <?php
+    // Check if form is submitted
+    if ($_SERVER["REQUEST_METHOD"] == "POST") {
+        // Retrieve and display the values
+        $name = $_POST["name"];
+        $email = $_POST["email"];
+        $gender = $_POST["gender"];
+        $interests = isset($_POST["interests"]) ? $_POST["interests"] : [];
+
+        echo "<h3>Form Submission Results</h3>";
+        echo "Name: $name<br/>";
+        echo "Email: $email<br/>";
+        echo "Gender: $gender<br/>";
+
+        if (!empty($interests)) {
+            echo "Interests: " . implode(", ", $interests) . "<br/>";
+        } else {
+            echo "No interests selected.<br/>";
+        }
+    }
+    ?>
+
+    <form action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>" method="post">
+        <label for="name">Name:</label>
+        <input type="text" name="name" id="name" required>
+
+        <br>
+
+        <label for="email">Email:</label>
+        <input type="email" name="email" id="email" required>
+
+        <br>
+
+        <label>Gender:</label>
+        <input type="radio" name="gender" value="male" id="male">
+        <label for="male">Male</label>
+        <input type="radio" name="gender" value="female" id="female">
+        <label for="female">Female</label>
+
+        <br>
+
+        <label>Interests:</label>
+        <input type="checkbox" name="interests[]" value="programming" id="programming">
+        <label for="programming">Programming</label>
+        <input type="checkbox" name="interests[]" value="reading" id="reading">
+        <label for="reading">Reading</label>
+        <input type="checkbox" name="interests[]" value="traveling" id="traveling">
+        <label for="traveling">Traveling</label>
+
+        <br>
+
+        <input type="submit" value="Submit">
+    </form>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/11_file.php b/5th_Semester/Web_Technology/Lab4 (PHP)/11_file.php
new file mode 100644
index 0000000..55a62ea
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/11_file.php	
@@ -0,0 +1,14 @@
+<?php
+$filename = "example.txt";
+
+// Read content from file
+$content = file_get_contents($filename);
+
+// Modify content
+$newContent = str_replace("old_text", "new_text", $content);
+
+// Write updated content back to file
+file_put_contents($filename, $newContent);
+
+echo "File updated successfully";
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/2_variables.php b/5th_Semester/Web_Technology/Lab4 (PHP)/2_variables.php
new file mode 100644
index 0000000..039ee32
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/2_variables.php	
@@ -0,0 +1,10 @@
+<?php
+$integerVar = 42;
+$floatVar = 3.14;
+$stringVar = "Hello, World!";
+define("MY_CONSTANT", "This is a constant");
+echo MY_CONSTANT . "<br>";
+echo $integerVar . "<br>";
+echo $floatVar . "<br>";
+echo $stringVar;
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/3_if-else.php b/5th_Semester/Web_Technology/Lab4 (PHP)/3_if-else.php
new file mode 100644
index 0000000..e3b881f
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/3_if-else.php	
@@ -0,0 +1,11 @@
+<?php
+$number = 7;
+
+if ($number > 0) {
+    echo "Positive";
+} elseif ($number < 0) {
+    echo "Negative";
+} else {
+    echo "Zero";
+}
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/4_function.php b/5th_Semester/Web_Technology/Lab4 (PHP)/4_function.php
new file mode 100644
index 0000000..8380eee
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/4_function.php	
@@ -0,0 +1,9 @@
+<?php
+function calculateAverage($numbers)
+{
+    return array_sum($numbers) / count($numbers);
+}
+
+$testArray = [5, 10, 15];
+echo calculateAverage($testArray);
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/5_class.php b/5th_Semester/Web_Technology/Lab4 (PHP)/5_class.php
new file mode 100644
index 0000000..65cc39c
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/5_class.php	
@@ -0,0 +1,13 @@
+<?php
+class Book
+{
+    public $title;
+    public $author;
+}
+
+$book1 = new Book();
+$book1->title = "The Great Gatsby";
+$book1->author = "F. Scott Fitzgerald";
+
+echo $book1->title . " by " . $book1->author;
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/6_form_retrieval.php b/5th_Semester/Web_Technology/Lab4 (PHP)/6_form_retrieval.php
new file mode 100644
index 0000000..746a858
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/6_form_retrieval.php	
@@ -0,0 +1,19 @@
+<html>
+<head>
+    <title>Q.6 Form retrieval</title>
+</head>
+
+<body>
+    <form method="post" action="#">
+        <input type="text" name="username" placeholder="Username">
+        <input type="submit" value="Submit">
+    </form>
+</body>
+</html>
+
+<?php
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $username = $_POST["username"];
+    echo "Submitted username: $username";
+}
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/7_enhancement_of_6.php b/5th_Semester/Web_Technology/Lab4 (PHP)/7_enhancement_of_6.php
new file mode 100644
index 0000000..e06cb04
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/7_enhancement_of_6.php	
@@ -0,0 +1,32 @@
+<?php
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $username = $_POST["username"];
+    $email = $_POST["email"];
+    $phone = $_POST["phone"];
+
+    if (empty($username) || empty($email) || empty($phone)) {
+        echo "All fields are required.";
+    } elseif (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
+        echo "Invalid email address.";
+    } elseif (!preg_match("/^(98|97)/", $phone)) {
+        echo "Phone number must start with 98 or 97.";
+    } else {
+        echo "Form data validated successfully!";
+    }
+}
+?>
+
+<html>
+<head>
+    <title>Q.7 Form validation</title>
+</head>
+
+<body>
+    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
+        <input type="text" name="username" placeholder="Username">
+        <input type="text" name="email" placeholder="Email">
+        <input type="text" name="phone" placeholder="Phone">
+        <input type="submit" value="Submit">
+    </form>
+</body>
+</html>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/8_button_click.php b/5th_Semester/Web_Technology/Lab4 (PHP)/8_button_click.php
new file mode 100644
index 0000000..1d53f34
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/8_button_click.php	
@@ -0,0 +1,14 @@
+<html>
+<head>
+    <title>Q.8 Button click</title>
+</head>
+<form method="post">
+    <input type="submit" name="submitBtn" value="Click me">
+</form>
+</html>
+
+<?php
+if (isset($_POST["submitBtn"])) {
+    echo "Button clicked!";
+}
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/9_cookies.php b/5th_Semester/Web_Technology/Lab4 (PHP)/9_cookies.php
new file mode 100644
index 0000000..c00dfaa
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/9_cookies.php	
@@ -0,0 +1,7 @@
+<?php
+setcookie("user_pref", "dark_mode", time() + 3600, "/");
+
+if (isset($_COOKIE["user_pref"])) {
+    echo "User preference: " . $_COOKIE["user_pref"];
+}
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/1_connection.php b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/1_connection.php
new file mode 100644
index 0000000..381989d
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/1_connection.php	
@@ -0,0 +1,12 @@
+<?php
+$servername = "localhost";
+$username = "root";
+$password = "";
+$dbname = "csit";
+
+$conn = mysqli_connect($servername, $username, $password, $dbname);
+
+if (!$conn) {
+    die("Connection failed: " . mysqli_connect_error());
+}
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/2_insert.php b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/2_insert.php
new file mode 100644
index 0000000..cb057ab
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/2_insert.php	
@@ -0,0 +1,39 @@
+<?php
+include "1_connection.php";
+
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    // Validate and sanitize input data
+    $name = filter_var($_POST["name"], FILTER_SANITIZE_STRING);
+    $email = filter_var($_POST["email"], FILTER_VALIDATE_EMAIL);
+
+    // Check if data is valid
+    if ($name && $email) {
+        $sql = "INSERT INTO first_semester (name, email) VALUES ('$name', '$email')";
+        if (mysqli_query($conn, $sql)) {
+            echo "Record inserted successfully!";
+        } else {
+            echo "Error: " . $sql . "<br>" . mysqli_error($conn);
+        }
+    } else {
+        echo "Invalid data provided.";
+    }
+
+    mysqli_close($conn);
+}
+?>
+
+<html>
+
+<head>
+    <title>Form validation and database insertion</title>
+</head>
+
+<body>
+    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
+        <input type="text" name="name" placeholder="Name">
+        <input type="text" name="email" placeholder="Email">
+        <input type="submit" value="Submit">
+    </form>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/3_retrieve.php b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/3_retrieve.php
new file mode 100644
index 0000000..5967d7f
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/3_retrieve.php	
@@ -0,0 +1,18 @@
+<?php
+include "1_connection.php";
+
+$sql = "SELECT * FROM first_semester";
+$result = mysqli_query($conn, $sql);
+
+if (mysqli_num_rows($result) > 0) {
+    echo "<table border='1'><tr><th>ID</th><th>Name</th><th>Email</th><th>Update</th><th>Delete</th></tr>";
+    while ($row = mysqli_fetch_assoc($result)) {
+        echo "<tr><td>" . $row["id"] . "</td><td>" . $row["name"] . "</td><td>" . $row["email"] . "</td><td><a href='4_edit.php?id=" . $row["id"] . "'>Update</a></td><td><a href='5_delete.php?id=" . $row["id"] . "'>Delete</a></td></tr>";
+    }
+    echo "</table>";
+} else {
+    echo "0 results";
+}
+
+mysqli_close($conn);
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/4_edit.php b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/4_edit.php
new file mode 100644
index 0000000..1f8825e
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/4_edit.php	
@@ -0,0 +1,40 @@
+<?php
+include "1_connection.php";
+
+if ($_SERVER["REQUEST_METHOD"] == "POST") {
+    $id = $_GET["id"];
+    // Validate and sanitize input data
+    $name = filter_var($_POST["name"], FILTER_SANITIZE_STRING);
+    $email = filter_var($_POST["email"], FILTER_VALIDATE_EMAIL);
+
+    // Check if data is valid
+    if ($name && $email) {
+        $sql = "UPDATE first_semester SET name='$name', email='$email' WHERE id='$id'";
+        if (mysqli_query($conn, $sql)) {
+            echo "Record inserted successfully!";
+        } else {
+            echo "Error: " . $sql . "<br>" . mysqli_error($conn);
+        }
+    } else {
+        echo "Invalid data provided.";
+    }
+
+    mysqli_close($conn);
+}
+?>
+
+<html>
+
+<head>
+    <title>Data edit</title>
+</head>
+
+<body>
+    <form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
+        <input type="text" name="name" placeholder="Name">
+        <input type="text" name="email" placeholder="Email">
+        <input type="submit" value="Submit">
+    </form>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/5_delete.php b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/5_delete.php
new file mode 100644
index 0000000..1010e4a
--- /dev/null
+++ b/5th_Semester/Web_Technology/Lab4 (PHP)/Connecting_to_database/5_delete.php	
@@ -0,0 +1,14 @@
+<?php
+include "1_connection.php";
+
+$id = $_GET["id"];
+
+$sql = "DELETE FROM first_semester WHERE id='$id'";
+if (mysqli_query($conn, $sql)) {
+    echo "Record deleted successfully!";
+} else {
+    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
+}
+
+mysqli_close($conn);
+?>
\ No newline at end of file
diff --git a/5th_Semester/Web_Technology/Lab3 (Javascript)/README.md b/5th_Semester/Web_Technology/Lab4 (PHP)/example.txt
similarity index 100%
rename from 5th_Semester/Web_Technology/Lab3 (Javascript)/README.md
rename to 5th_Semester/Web_Technology/Lab4 (PHP)/example.txt
diff --git a/5th_Semester/Web_Technology/README.md b/5th_Semester/Web_Technology/README.md
index 68a1bb8..1f46ca8 100644
--- a/5th_Semester/Web_Technology/README.md
+++ b/5th_Semester/Web_Technology/README.md
@@ -4,8 +4,7 @@
 
 1. [Lab Assignment-I (HTML)](<Lab1 (HTML)/README.md>)
 2. [Lab Assignment-II (CSS)](<Lab2 (CSS)/README.md>)
-3. [Lab Assignment-III (JavaScript)](<Lab3 (Javascript)/README.md>)
+3. [Lab Assignment-III (Javascript and XML)](<Lab3 (Javascript & XML)/README.md>)
 4. [Lab Assignment-IV (PHP)](<Lab4 (PHP)/README.md>)
-5. [Lab Assignment-V (Javascript and XML)](<Lab5 (Javascript & XML)/README.md>)
 
 ## [Class Codes](class_codes/README.md)