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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 |
|---|---|
| 244 | |
| 245 | if ( ! empty( $errors ) ) { |
| 246 | /** |
| 247 | * Filters the error messages displayed above the login form. |
| 248 | * |
| 249 | * @since 2.1.0 |
| 250 | * |
| 251 | * @param string $errors Login error message. |
| 252 | */ |
| 253 | echo '<div id="login_error">' . apply_filters( 'login_errors', $errors ) . "</div>\n"; |
| 254 | } |
| 255 | |
| 256 | if ( ! empty( $messages ) ) { |
| 257 | /** |
| 258 | * Filters instructional messages displayed above the login form. |
| 259 | * |
| 260 | * @since 2.5.0 |
| 261 | * |
| 262 | * @param string $messages Login messages. |