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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 |
|---|---|
| 19 | |
| 20 | /** |
| 21 | * Fires just before the action handler in several Network Admin screens. |
| 22 | * |
| 23 | * This hook fires on multiple screens in the Multisite Network Admin, |
| 24 | * including Users, Network Settings, and Site Settings. |
| 25 | * |
| 26 | * @since 3.0.0 |
| 27 | */ |
| 28 | do_action( 'wpmuadminedit' ); |
| 29 | |
| 30 | /** |
| 31 | * Fires the requested handler action. |
| 32 | * |
| 33 | * The dynamic portion of the hook name, `$action`, refers to the name |
| 34 | * of the requested action derived from the `GET` request. |
| 35 | * |
| 36 | * @since 3.1.0 |
| 37 | */ |