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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 |
|---|---|
| 1831 | /** |
| 1832 | * Filters the category nicename before it is sanitized. |
| 1833 | * |
| 1834 | * Use the {@see 'pre_$taxonomy_$field'} hook instead. |
| 1835 | * |
| 1836 | * @since 2.0.3 |
| 1837 | * |
| 1838 | * @param string $value The category nicename. |
| 1839 | */ |
| 1840 | $value = apply_filters( 'pre_category_nicename', $value ); |
| 1841 | } |
| 1842 | } elseif ( 'rss' === $context ) { |
| 1843 | |
| 1844 | /** |
| 1845 | * Filters the term field for use in RSS. |
| 1846 | * |
| 1847 | * The dynamic portion of the hook name, `$field`, refers to the term field. |
| 1848 | * |
| 1849 | * @since 2.3.0 |