What is the issue with displaying error messages for multiple fields in PHP when transferring data to a database?

When transferring data to a database in PHP, the issue with displaying error messages for multiple fields is that only one error message may be shown at a time, making it difficult for users to identify and correct multiple errors. To solve this issue, you can store all error messages in an array and display them all at once to provide users with a comprehensive list of issues that need to be addressed.

<?php
$errors = array();

// Validate each field and store error messages in the $errors array
if(empty($username)) {
    $errors[] = "Username is required";
}

if(empty($email)) {
    $errors[] = "Email is required";
}

// Check if there are any errors and display them all at once
if(!empty($errors)) {
    foreach($errors as $error) {
        echo $error . "<br>";
    }
} else {
    // Proceed with transferring data to the database
}
?>