How can PHP variables be accessed from an HTML form submission using the POST method?

To access PHP variables from an HTML form submission using the POST method, you can use the $_POST superglobal array in PHP. When a form is submitted using the POST method, the form data is sent to the server in the body of the HTTP request. PHP automatically populates the $_POST array with the form data, using the name attributes of the form input fields as keys. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $username = $_POST['username'];
    $password = $_POST['password'];
    
    // Access the submitted variables
    echo "Username: " . $username . "<br>";
    echo "Password: " . $password;
}
?>

<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <label for="username">Username:</label>
    <input type="text" id="username" name="username"><br>
    
    <label for="password">Password:</label>
    <input type="password" id="password" name="password"><br>
    
    <input type="submit" value="Submit">
</form>

Keywords

PHP HTML form POST method variable access submission

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