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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 |
---|---|
465 | * |
466 | * @param string $username User's username |
467 | * @param string $password User's password |
468 | * @return WP_Error|WP_User WP_User object if login successful, otherwise WP_Error object. |
469 | */ |
470 | function wp_authenticate($username, $password) { |
471 | $username = sanitize_user($username); |
472 | $password = trim($password); |
473 |
|
474 | $user = apply_filters('authenticate', null, $username, $password); |
475 |
|
476 | if ( $user == null ) { |
477 | // TODO what should the error message be? (Or would these even happen?) |
478 | // Only needed if all authentication handlers fail to return anything. |
479 | $user = new WP_Error('authentication_failed', __('<strong>ERROR</strong>: Invalid username or incorrect password.')); |
480 | } |
481 |
|
482 | $ignore_codes = array('empty_username', 'empty_password'); |
483 |
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