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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 |
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548 | * If a non-null value is passed, the filter will effectively short-circuit |
549 | * authentication, returning an error instead. |
550 | * |
551 | * @since 2.8.0 |
552 | * |
553 | * @param null|WP_User $user User to authenticate. |
554 | * @param string $username User login. |
555 | * @param string $password User password |
556 | */ |
557 | $user = apply_filters( 'authenticate', null, $username, $password ); |
558 |
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559 | if ( $user == null ) { |
560 | // TODO what should the error message be? (Or would these even happen?) |
561 | // Only needed if all authentication handlers fail to return anything. |
562 | $user = new WP_Error('authentication_failed', __('<strong>ERROR</strong>: Invalid username or incorrect password.')); |
563 | } |
564 |
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565 | $ignore_codes = array('empty_username', 'empty_password'); |
566 |
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