What are the best practices for handling form submissions in PHP, especially in terms of action attributes and server variables?

When handling form submissions in PHP, it is important to set the form's action attribute to the same PHP file that processes the form data. This ensures that the form data is submitted to the correct location for processing. Additionally, using server variables like $_POST or $_GET to retrieve form data helps prevent security vulnerabilities such as SQL injection attacks. 

<form method="post" action="<?php echo htmlspecialchars($_SERVER["PHP_SELF"]); ?>">
    // form fields here
</form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // process form data using $_POST variables
}
?>

Keywords

form submissions action attribute server variables PHP functions error handling

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