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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 |
|---|---|
| 1921 | /** |
| 1922 | * Filter the category nicename before it is sanitized. |
| 1923 | * |
| 1924 | * Use the pre_{$taxonomy}_{$field} hook instead. |
| 1925 | * |
| 1926 | * @since 2.0.3 |
| 1927 | * |
| 1928 | * @param string $value The category nicename. |
| 1929 | */ |
| 1930 | $value = apply_filters( 'pre_category_nicename', $value ); |
| 1931 | } |
| 1932 | |
| 1933 | } elseif ( 'rss' == $context ) { |
| 1934 | |
| 1935 | /** |
| 1936 | * Filter the term field for use in RSS. |
| 1937 | * |
| 1938 | * The dynamic portion of the filter name, `$field`, refers to the term field. |
| 1939 | * |