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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 |
|---|---|
| 1655 | /** |
| 1656 | * Filters the category nicename before it is sanitized. |
| 1657 | * |
| 1658 | * Use the {@see 'pre_$taxonomy_$field'} hook instead. |
| 1659 | * |
| 1660 | * @since 2.0.3 |
| 1661 | * |
| 1662 | * @param string $value The category nicename. |
| 1663 | */ |
| 1664 | $value = apply_filters( 'pre_category_nicename', $value ); |
| 1665 | } |
| 1666 | } elseif ( 'rss' === $context ) { |
| 1667 | |
| 1668 | /** |
| 1669 | * Filters the term field for use in RSS. |
| 1670 | * |
| 1671 | * The dynamic portion of the filter name, `$field`, refers to the term field. |
| 1672 | * |
| 1673 | * @since 2.3.0 |