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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 |
|---|---|
| 598 | /** |
| 599 | * Filter the arguments for the Categories widget drop-down. |
| 600 | * |
| 601 | * @since 2.8.0 |
| 602 | * |
| 603 | * @see wp_dropdown_categories() |
| 604 | * |
| 605 | * @param array $cat_args An array of Categories widget drop-down arguments. |
| 606 | */ |
| 607 | wp_dropdown_categories( apply_filters( 'widget_categories_dropdown_args', $cat_args ) ); |
| 608 | ?> |
| 609 | |
| 610 | <script type='text/javascript'> |
| 611 | /* <![CDATA[ */ |
| 612 | (function() { |
| 613 | var dropdown = document.getElementById( "<?php echo esc_js( $dropdown_id ); ?>" ); |
| 614 | function onCatChange() { |
| 615 | if ( dropdown.options[ dropdown.selectedIndex ].value > 0 ) { |
| 616 | location.href = "<?php echo home_url(); ?>/?cat=" + dropdown.options[ dropdown.selectedIndex ].value; |