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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 |
|---|---|
| 128 | * @since 2.1.0 |
| 129 | */ |
| 130 | do_action( "admin_head-$hook_suffix" ); |
| 131 | |
| 132 | /** |
| 133 | * Fires in head section for all admin pages. |
| 134 | * |
| 135 | * @since 2.1.0 |
| 136 | */ |
| 137 | do_action( 'admin_head' ); |
| 138 | |
| 139 | if ( get_user_setting('mfold') == 'f' ) |
| 140 | $admin_body_class .= ' folded'; |
| 141 | |
| 142 | if ( !get_user_setting('unfold') ) |
| 143 | $admin_body_class .= ' auto-fold'; |
| 144 | |
| 145 | if ( is_admin_bar_showing() ) |
| 146 | $admin_body_class .= ' admin-bar'; |