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.
PHP $_GET Function
The built-in $_GET function is used to collect values in a form with method="get".
The $_GET Function
The built-in $_GET function is used to collect values from a form sent with method="get".Information sent from a form with the GET method is visible to everyone (it will be displayed in the browser's address bar) and has limits on the amount of information to send (max. 100 characters).
Example
<form action="welcome.php" method="get"> Name: <input type="text" name="fname" /> Age: <input type="text" name="age" /> <input type="submit" /> </form> |
http://www.example.com/welcome.php?fname=Peter&age=37 |
Welcome <?php echo $_GET["fname"]; ?>.<br /> You are <?php echo $_GET["age"]; ?> years old! |
When to use method="get"?
When using method="get" in HTML forms, all variable names and values are displayed in the URL.Note:This method should not be used when sending passwords or other sensitive information!
However, because the variables are displayed in the URL, it is possible to bookmark the page. This can be useful in some cases.
Note:The get method is not suitable for large variable values; the value cannot exceed 100 characters.
PHP $_POST Function
The built-in $_POST function is used to collect values in a form with method="post".
The $_POST Function
The built-in $_POST function is used to collect values from a form sent with method="post".Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send.
Note:However, there is an 8 Mb max size for the POST method, by default (can be changed by setting the post_max_size in the php.ini file).
Example
<form action="welcome.php" method="post"> Name: <input type="text" name="fname" /> Age: <input type="text" name="age" /> <input type="submit" /> </form> |
http://www.example.com/welcome.php |
Welcome <?php echo $_POST["fname"]; ?>!<br /> You are <?php echo $_POST["age"]; ?> years old. |
When to use method="post"?
Information sent from a form with the POST method is invisible to others and has no limits on the amount of information to send.However, because the variables are not displayed in the URL, it is not possible to bookmark the page.
The PHP $_REQUEST Function
The PHP built-in $_REQUEST function contains the contents of both $_GET, $_POST, and $_COOKIE.The $_REQUEST function can be used to collect form data sent with both the GET and POST methods.
Example
Welcome <?php echo $_REQUEST["fname"]; ?>!<br /> You are <?php echo $_REQUEST["age"]; ?> years old. |
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