php form validation before submit

There are a number of possibilities, including saving it in a database or emailing the data to yourself. I've been following the example on w3schools:http://www.w3schools.com/php/php_form_validation.asp, I now get an "Call to undefined function test_input()" error on this line $name = test_input($_POST["name"]); in w3_example.php. How to Validate Form Using PHP Before validating the form, You have to set the following basic requirements. It needs to be filled with authentic data from your users. Create Form Validation Rules that are required in your project form. ", // Now we can rebuild our validation constraint, // Because we do not rely on CSS pseudo-class, we have to, // explicitly set the valid/invalid class on our email field, // Here, we test if the field is empty (remember, the field is not required). here is my javascript code I am trying to put together but it's not working, it submits the form without doing any checks. Email Address must be valid format containing @ symbol. We are aiming to show the error messages inside a element. check each $_POST variable with the test_input() function, and the script looks like this: Notice that at the start of the script, we check whether the form has been This example involves a simple text with an associated