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These pages will show how to process PHP forms with security in mind. Proper validation of form data is important to protect your form from hackers and spammers! The HTML form we will be working at in these chapters, contains various input fields: required and optional text fields, radio buttons, and a submit button:
- Php
PHP Form Validation Example * required field. Name: *...
- PHP Form Handling
You need to validate form data to protect your script from...
- Php
PHP provides several built-in functions for form validation, including: filter_var() - Validates variables with filters. is_numeric() - Checks if a value is a number. is_string() - Checks if a value is a string. trim() - Removes whitespace from the beginning and end of a string.
PHP can validate form input server side, submitted by the user using HTML forms. You need to check a few things: Numbers only. Empty values. Input length. Strip HTML tags. Email address.
PHP Form Validation Example * required field. Name: * E-mail: * Website: Comment: Gender: Female Male Other *
if ($_SERVER["REQUEST_METHOD"] == "POST") {. $name = test_input ($_POST["name"]); $email = test_input ($_POST["email"]); $website = test_input ($_POST["website"]); $comment = test_input ($_POST["comment"]); $gender = test_input ($_POST["gender"]); } function test_input ($data) {. $data = trim ($data);
In this tutorial, you'll learn about PHP form validation and show error messages if the user inputs are invalid.
You need to validate form data to protect your script from malicious code. Think SECURITY when processing PHP forms! This page does not contain any form validation, it just shows how you can send and retrieve form data. However, the next pages will show how to process PHP forms with security in mind!
