What is the best practice for handling form submission in PHP to ensure data accuracy before sending?

To ensure data accuracy before sending form submissions in PHP, it is best practice to validate the input data on the server-side before processing it. This can be done by checking for required fields, validating input formats (such as email addresses or numbers), and sanitizing input to prevent SQL injections or other security vulnerabilities. 

// Validate form submission data
$errors = array();

// Check if required fields are not empty
if(empty($_POST['name'])) {
    $errors[] = "Name is required";
}

// Validate email format
if(!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
    $errors[] = "Invalid email format";
}

// Sanitize input data
$name = htmlspecialchars($_POST['name']);
$email = filter_var($_POST['email'], FILTER_SANITIZE_EMAIL);

// Process form submission if no errors
if(empty($errors)) {
    // Process form data here
} else {
    // Display errors to the user
    foreach($errors as $error) {
        echo $error . "<br>";
    }
}

Keywords

form submission data accuracy validation PHP functions error handling

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