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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 |
|---|---|
| 154 | * @since 2.1.0 |
| 155 | */ |
| 156 | do_action( "admin_head-{$hook_suffix}" ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores |
| 157 | |
| 158 | /** |
| 159 | * Fires in head section for all admin pages. |
| 160 | * |
| 161 | * @since 2.1.0 |
| 162 | */ |
| 163 | do_action( 'admin_head' ); |
| 164 | |
| 165 | if ( 'f' === get_user_setting( 'mfold' ) ) { |
| 166 | $admin_body_class .= ' folded'; |
| 167 | } |
| 168 | |
| 169 | if ( ! get_user_setting( 'unfold' ) ) { |
| 170 | $admin_body_class .= ' auto-fold'; |
| 171 | } |
| 172 | |