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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 |
|---|---|
| 1471 | /** |
| 1472 | * Filters the category nicename before it is sanitized. |
| 1473 | * |
| 1474 | * Use the {@see 'pre_$taxonomy_$field'} hook instead. |
| 1475 | * |
| 1476 | * @since 2.0.3 |
| 1477 | * |
| 1478 | * @param string $value The category nicename. |
| 1479 | */ |
| 1480 | $value = apply_filters( 'pre_category_nicename', $value ); |
| 1481 | } |
| 1482 | |
| 1483 | } elseif ( 'rss' == $context ) { |
| 1484 | |
| 1485 | /** |
| 1486 | * Filters the term field for use in RSS. |
| 1487 | * |
| 1488 | * The dynamic portion of the filter name, `$field`, refers to the term field. |
| 1489 | * |