What are the potential reasons for not getting any output when trying to access POST values in PHP?

One potential reason for not getting any output when trying to access POST values in PHP could be that the form method is not set to "POST" in the HTML form. Another reason could be that the PHP script is not properly retrieving the POST values using the $_POST superglobal. To solve this issue, make sure that the form method is set to "POST" and use the $_POST superglobal to access the POST values. 

<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") {
    $username = $_POST["username"];
    $password = $_POST["password"];
    
    echo "Username: " . $username . "<br>";
    echo "Password: " . $password;
}
?>

Keywords

POST values PHP form submission $_POST array debugging

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