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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 |
|---|---|
| 683 | /** |
| 684 | * Filter the arguments for the Categories widget drop-down. |
| 685 | * |
| 686 | * @since 2.8.0 |
| 687 | * |
| 688 | * @see wp_dropdown_categories() |
| 689 | * |
| 690 | * @param array $cat_args An array of Categories widget drop-down arguments. |
| 691 | */ |
| 692 | wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args ) ); |
| 693 | ?> |
| 694 | |
| 695 | <script type='text/javascript'> |
| 696 | /* <![CDATA[ */ |
| 697 | (function() { |
| 698 | var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" ); |
| 699 | function onCatChange() { |
| 700 | if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) { |
| 701 | location.href = "<?php echo home_url(); ?>/?cat=" + dropdown.options[ dropdown.selectedIndex ].value; |