Monday, 20 January 2014

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A complete PHP Tutorial For Beginners To Learn PHP Basic Part 5

Posted by Unknown at 01:23

  • PHP Forms and User Input

    • PHP Form Handling


      • The most important thing to notice when dealing with HTML forms and PHP is that any form element in an HTML page will automatically be available to your PHP scripts.

      • Example

        • The example below contains an HTML form with two input fields and a submit button:
        1. <html> 
        2. <body> 
        3. <form action="welcome.php" method="post"> 
        4. Name: <input type="text" name="fname" /> 
        5. Age: <input type="text" name="age" /> 
        6. <input type="submit" /> 
        7. </form> 
        8. </body> 
        9. </html>
        • When a user fills out the form above and click on the submit button, the form data is sent to a PHP file, called "welcome.php": like this:
        1. <html> 
        2. <body> 
        3. Welcome <?php echo $_POST["fname"]; ?>!<br />
        4.  You are <?php echo $_POST["age"]; ?> years old. 
        5. </body> 
        6. </html>
        • Output
      • Welcome John! 
      • You are 28 years old.

      • Form Validation


        • User input should be validated on the browser whenever possible (by client scripts). Browser validation is faster and reduces the server load. You should consider server validation if the user input will be inserted into a database. A good way to validate a form on the server is to post the form to itself, instead of jumping to a different page. The user will then get the error messages on the same page as the form. This makes it easier to discover the error.

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