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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 |
|---|---|
| 216 | * @since 3.1.0 |
| 217 | */ |
| 218 | do_action( 'network_admin_notices' ); |
| 219 | } elseif ( is_user_admin() ) { |
| 220 | /** |
| 221 | * Print user admin screen notices. |
| 222 | * |
| 223 | * @since 3.1.0 |
| 224 | */ |
| 225 | do_action( 'user_admin_notices' ); |
| 226 | } else { |
| 227 | /** |
| 228 | * Print admin screen notices. |
| 229 | * |
| 230 | * @since 3.1.0 |
| 231 | */ |
| 232 | do_action( 'admin_notices' ); |
| 233 | } |
| 234 | |