PHP code lives inside special tags in an HTML file.
  
  ## PHP tags
  
  ```php
  <?php
  // PHP code here
  ?>
  ```
  
  Anything outside is plain HTML.
  
  ## Example: PHP inside HTML
  
  ```php
  <!DOCTYPE html>
  <html>
  <body>
    <h1>Welcome</h1>
    <p>
      <?php
        echo "Today is " . date("Y-m-d");
      ?>
    </p>
  </body>
  </html>
  ```
  
  ## Rules to remember
  
  - Statements end with semicolon ;
  - Variables start with $
  - PHP is case-sensitive for variables
  
  ## Comment styles
  
  ```php
  // single line
  # single line
  /* multi
     line */
  ```
  
  > Next: Variables, data types, and strings in PHP.

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