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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 |
|---|---|
| 1771 | /** |
| 1772 | * Filters the category nicename before it is sanitized. |
| 1773 | * |
| 1774 | * Use the {@see 'pre_$taxonomy_$field'} hook instead. |
| 1775 | * |
| 1776 | * @since 2.0.3 |
| 1777 | * |
| 1778 | * @param string $value The category nicename. |
| 1779 | */ |
| 1780 | $value = apply_filters( 'pre_category_nicename', $value ); |
| 1781 | } |
| 1782 | } elseif ( 'rss' === $context ) { |
| 1783 | |
| 1784 | /** |
| 1785 | * Filters the term field for use in RSS. |
| 1786 | * |
| 1787 | * The dynamic portion of the hook name, `$field`, refers to the term field. |
| 1788 | * |
| 1789 | * @since 2.3.0 |