What are some common pitfalls when passing variables from one PHP file to another using forms?

One common pitfall when passing variables from one PHP file to another using forms is not properly sanitizing user input, which can lead to security vulnerabilities like SQL injection. To solve this issue, always use functions like htmlspecialchars() or mysqli_real_escape_string() to sanitize user input before passing it to another PHP file. 

// Form handling in the first PHP file
$name = htmlspecialchars($_POST['name']);
$email = htmlspecialchars($_POST['email']);

// Pass variables to another PHP file using GET method
header("Location: second_php_file.php?name=$name&email=$email");
exit;
```

In the second PHP file, retrieve the variables like this:

```php
// Retrieve variables from the first PHP file
$name = htmlspecialchars($_GET['name']);
$email = htmlspecialchars($_GET['email']);

Keywords

PHP form submission $_POST $_GET data validation

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