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Showing posts from November 22, 2012

Form Validation and user inputs

User input should be validated on the browser whenever possible (by client scripts). Browser validation is faster and reduces the server load. The PHP $_GET and $_POST variables are used to retrieve information from forms, like user input. The $_GET Variable The predefined $_GET variable is used to collect values in a form 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. Example <form action=”welcome.php” method=”get”> Name: <input type=”text” name=”fname” /> Age: <input type=”text” name=”age” /> <input type=”submit” /> </form> When the user clicks the “Submit” button, the URL sent to the server could look something like this: http://localhost/welcome.php?fname=Peter&age=37 The “welcome.php” file can now use the $_GET variable to collect form data (the names of the form fields will ...