What are some potential reasons for missing fields in the $_POST data when submitting a form with multiple inputs?

One potential reason for missing fields in the $_POST data when submitting a form with multiple inputs could be that the form fields are not named correctly or there may be a typo in the field names. To solve this issue, make sure that each input field in the form has a unique name attribute and that the names match the keys in the $_POST array. 

<form method="post">
    <input type="text" name="username">
    <input type="password" name="password">
    <input type="submit" value="Submit">
</form>

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Use the $username and $password variables as needed
}
?>

Keywords

$_POST form submission missing fields data validation server-side processing

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