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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 |
|---|---|
| 417 | * |
| 418 | * @since 2.8.0 |
| 419 | * @since 4.1.0 Added `$user_login` and `$user_data` parameters. |
| 420 | * |
| 421 | * @param string $message Default mail message. |
| 422 | * @param string $key The activation key. |
| 423 | * @param string $user_login The username for the user. |
| 424 | * @param WP_User $user_data WP_User object. |
| 425 | */ |
| 426 | $message = apply_filters( 'retrieve_password_message', $message, $key, $user_login, $user_data ); |
| 427 | |
| 428 | if ( $message && ! wp_mail( $user_email, wp_specialchars_decode( $title ), $message ) ) { |
| 429 | wp_die( __( 'The email could not be sent.' ) . "<br />\n" . __( 'Possible reason: your host may have disabled the mail() function.' ) ); |
| 430 | } |
| 431 | |
| 432 | return true; |
| 433 | } |
| 434 | |
| 435 | // |