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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 |
|---|---|
| 164 | // @link: http://core.trac.wordpress.org/ticket/20027 |
| 165 | add_filter( 'pre_option_stylesheet', array( $this, 'get_stylesheet' ) ); |
| 166 | add_filter( 'pre_option_template', array( $this, 'get_template' ) ); |
| 167 | |
| 168 | // Handle custom theme roots. |
| 169 | add_filter( 'pre_option_stylesheet_root', array( $this, 'get_stylesheet_root' ) ); |
| 170 | add_filter( 'pre_option_template_root', array( $this, 'get_template_root' ) ); |
| 171 | } |
| 172 | |
| 173 | do_action( 'start_previewing_theme', $this ); |
| 174 | } |
| 175 | |
| 176 | /** |
| 177 | * Stop previewing the selected theme. |
| 178 | * |
| 179 | * Removes filters to change the current theme. |
| 180 | * |
| 181 | * @since 3.4.0 |
| 182 | */ |