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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 |
|---|---|
| 1937 | * @access public |
| 1938 | * |
| 1939 | * @param string $permalink_structure Permalink structure. |
| 1940 | */ |
| 1941 | function set_permalink_structure($permalink_structure) { |
| 1942 | if ( $permalink_structure != $this->permalink_structure ) { |
| 1943 | $old_permalink_structure = $this->permalink_structure; |
| 1944 | update_option('permalink_structure', $permalink_structure); |
| 1945 | $this->init(); |
| 1946 | do_action('permalink_structure_changed', $old_permalink_structure, $permalink_structure); |
| 1947 | } |
| 1948 | } |
| 1949 | |
| 1950 | /** |
| 1951 | * Set the category base for the category permalink. |
| 1952 | * |
| 1953 | * Will update the 'category_base' option, if there is a difference between |
| 1954 | * the current category base and the parameter value. Calls |
| 1955 | * {@link WP_Rewrite::init()} after the option is updated. |