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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 |
|---|---|
| 1638 | * Filters a taxonomy field before it is sanitized. |
| 1639 | * |
| 1640 | * The dynamic portions of the filter name, `$taxonomy` and `$field`, refer |
| 1641 | * to the taxonomy slug and field name, respectively. |
| 1642 | * |
| 1643 | * @since 2.3.0 |
| 1644 | * |
| 1645 | * @param mixed $value Value of the taxonomy field. |
| 1646 | */ |
| 1647 | $value = apply_filters( "pre_{$taxonomy}_{$field}", $value ); |
| 1648 | |
| 1649 | // Back compat filters. |
| 1650 | if ( 'slug' === $field ) { |
| 1651 | /** |
| 1652 | * Filters the category nicename before it is sanitized. |
| 1653 | * |
| 1654 | * Use the {@see 'pre_$taxonomy_$field'} hook instead. |
| 1655 | * |
| 1656 | * @since 2.0.3 |