How can one effectively debug and troubleshoot $_POST related problems in PHP?

When debugging $_POST related problems in PHP, start by checking if the form method is set to "post" in the HTML form. Then, use var_dump($_POST) to see the data being sent from the form. Make sure the form fields have the correct name attributes that match the keys in the $_POST array. 

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

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    var_dump($_POST);
    // Check if $_POST data is being received correctly
}
?>

Keywords

$_POST debugging troubleshooting PHP functions error types

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