Week2

• Request Handling in PHP

  1. Forms

  2. Client-server architecture

  3. HTML Input Elements

  4. Outlines
• Request Handling in PHP

  Forms and client server architecture
• HTML Form Input Types

  • text
  • button
  • checkbox
  • file
  • hidden
  • image
  • password
  • radio
  • submit
• HTML5 Form Input Types

  • color
  • date
  • datetime-local
  • email
  • month
  • number
  • range
  • search
  • tel
  • time
  • url
  • week
• Client-Server data passing


  1. HTML Form Page displayed to user

  2. Pass data to PHP script and interpret it

  3. Send results back as HTML/CSS/JS (Client side languages)
• Accessing form variables from within PHP


  1. Submit form to server

  2. Run PHP script; pass in form data

  3. Pass back HTML to client
• GET


  Default method. If the request has parameters, they are sent in the URL as a query string
• POST


  If the request has parameters, they are embedded in the request's HTTP packet, not the URL
• Superglobal associative arrays


  • $_REQUEST, $_GET, $_POST
  • $_SERVER
  • $_SESSION, $_COOKIE
  • $_FILES
• PHP Form Validation – Server Side Validation

  1. Empty String

  2. Validate String

  3. Validate Numbers

  4. Validate Email

  5. Validate URL

  6. Input length
• Linking to other files in PHP


  We reference our CSS and JavaScript files in our HTML output via the link and script tags.<|>We reference content we want to link to or allow a user to view/download, we achieve this via body-level anchor tags.
• Linking to other PHP files

  Other PHP files can also be included easily using __DIR__ to obtain the current code working directory
• Content Delivery Networks (CDNs)


  It is becoming increasingly common to store these files on a different server. These are known as Content Delivery Networks (CDN).
• HereDoc


  Use the HereDoc syntax to delimit strings in PHP. This can allow you to mix larger sections of HTML inside your PHP code.
• Null coalescing operator