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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 |
|---|---|
| 222 | * @since 3.1.0 |
| 223 | */ |
| 224 | do_action( 'network_admin_notices' ); |
| 225 | } elseif ( is_user_admin() ) { |
| 226 | /** |
| 227 | * Print user admin screen notices. |
| 228 | * |
| 229 | * @since 3.1.0 |
| 230 | */ |
| 231 | do_action( 'user_admin_notices' ); |
| 232 | } else { |
| 233 | /** |
| 234 | * Print admin screen notices. |
| 235 | * |
| 236 | * @since 3.1.0 |
| 237 | */ |
| 238 | do_action( 'admin_notices' ); |
| 239 | } |
| 240 | |