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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 460 | * |
| 461 | * @param string $username User's username |
| 462 | * @param string $password User's password |
| 463 | * @return WP_User|WP_Error WP_User object if login successful, otherwise WP_Error object. |
| 464 | */ |
| 465 | function wp_authenticate($username, $password) { |
| 466 | $username = sanitize_user($username); |
| 467 | $password = trim($password); |
| 468 | |
| 469 | $user = apply_filters('authenticate', null, $username, $password); |
| 470 | |
| 471 | if ( $user == null ) { |
| 472 | // TODO what should the error message be? (Or would these even happen?) |
| 473 | // Only needed if all authentication handlers fail to return anything. |
| 474 | $user = new WP_Error('authentication_failed', __('<strong>ERROR</strong>: Invalid username or incorrect password.')); |
| 475 | } |
| 476 | |
| 477 | $ignore_codes = array('empty_username', 'empty_password'); |
| 478 | |