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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 |
|---|---|
| 3335 | * |
| 3336 | * @since 2.8.0 |
| 3337 | * @since 4.1.0 Added `$user_login` and `$user_data` parameters. |
| 3338 | * |
| 3339 | * @param string $message Email message. |
| 3340 | * @param string $key The activation key. |
| 3341 | * @param string $user_login The username for the user. |
| 3342 | * @param WP_User $user_data WP_User object. |
| 3343 | */ |
| 3344 | $message = apply_filters( 'retrieve_password_message', $message, $key, $user_login, $user_data ); |
| 3345 | |
| 3346 | // Short-circuit on falsey $message value for backwards compatibility. |
| 3347 | if ( ! $message ) { |
| 3348 | return true; |
| 3349 | } |
| 3350 | |
| 3351 | /* |
| 3352 | * Wrap the single notification email arguments in an array |
| 3353 | * to pass them to the retrieve_password_notification_email filter. |