Form URL/EMAIL should validate that user enters proper format URL/EMAIL. The easiest way to validate the URL/EMAIL by using below function.

We can check each $_POST variable with the validate_input() function, and the script looks like this:

$email = validate_input($_POST["email"]);
$url = validate_input($_POST["url"]);
function validate_input($data) {
$data = trim($data);
$data = stripslashes($data);
$data = htmlspecialchars($data);
return $data;

trim() function

Removes whitespace and other predefined characters from both sides of a string

stripslashes() function

Removes backslashes added. This function can be used to clean up data retrieved from an HTML form.

htmlspecialchars() function

convert the predefined charecters like < (less than), > (greater than) etc. in to HTML entities

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