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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 |
---|---|
1750 | * Filters a taxonomy field before it is sanitized. |
1751 | * |
1752 | * The dynamic portions of the filter name, `$taxonomy` and `$field`, refer |
1753 | * to the taxonomy slug and field name, respectively. |
1754 | * |
1755 | * @since 2.3.0 |
1756 | * |
1757 | * @param mixed $value Value of the taxonomy field. |
1758 | */ |
1759 | $value = apply_filters( "pre_{$taxonomy}_{$field}", $value ); |
1760 |
|
1761 | // Back compat filters. |
1762 | if ( 'slug' === $field ) { |
1763 | /** |
1764 | * Filters the category nicename before it is sanitized. |
1765 | * |
1766 | * Use the {@see 'pre_$taxonomy_$field'} hook instead. |
1767 | * |
1768 | * @since 2.0.3 |