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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 |
|---|---|
| 1256 | /** |
| 1257 | * Filters the message body of the new user activation email sent |
| 1258 | * to the network administrator. |
| 1259 | * |
| 1260 | * @since MU |
| 1261 | * |
| 1262 | * @param string $msg Email body. |
| 1263 | * @param WP_User $user WP_User instance of the new user. |
| 1264 | */ |
| 1265 | $msg = apply_filters( 'newuser_notify_siteadmin', $msg, $user ); |
| 1266 | wp_mail( $email, sprintf(__('New User Registration: %s'), $user->user_login), $msg ); |
| 1267 | return true; |
| 1268 | } |
| 1269 | |
| 1270 | /** |
| 1271 | * Check whether a blogname is already taken. |
| 1272 | * |
| 1273 | * Used during the new site registration process to ensure |
| 1274 | * that each blogname is unique. |