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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 |
|---|---|
| 175 | // @link: http://core.trac.wordpress.org/ticket/20027 |
| 176 | add_filter( 'pre_option_stylesheet', array( $this, 'get_stylesheet' ) ); |
| 177 | add_filter( 'pre_option_template', array( $this, 'get_template' ) ); |
| 178 | |
| 179 | // Handle custom theme roots. |
| 180 | add_filter( 'pre_option_stylesheet_root', array( $this, 'get_stylesheet_root' ) ); |
| 181 | add_filter( 'pre_option_template_root', array( $this, 'get_template_root' ) ); |
| 182 | } |
| 183 | |
| 184 | do_action( 'start_previewing_theme', $this ); |
| 185 | } |
| 186 | |
| 187 | /** |
| 188 | * Stop previewing the selected theme. |
| 189 | * |
| 190 | * Removes filters to change the current theme. |
| 191 | * |
| 192 | * @since 3.4.0 |
| 193 | */ |