Question

what is the order of execution in web ? PHP, HTML, Javascript, css and mysql are the items to execute

Answer 1

The order is like this:

• Browser – send request
• Server – execute PHP script
• Server – send output to browser
• Browser – read output and execute JavaScript

Here is an example:

• Browser: requesting page /index.php

• Server: execute index.php file on the server

  <?php echo "Hello, world!;"; ?> <script>alert("hello!")</script>

• Server: respond the output

• Browser: parse the output
• Browser: <script> detected, alert("hello!")