How does PHP automatically handle form fields and store them in $_POST[]?

PHP automatically handles form fields by storing their values in the $_POST[] superglobal array. This array contains key-value pairs where the key is the name attribute of the form field and the value is the data entered by the user. To access the form field data, you can simply use $_POST['field_name'] where 'field_name' is the name attribute of the form field. 

<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

PHP form fields $_POST[] automatic handling data storage

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