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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.
This hook occurs 2 times in this file.
| Line | Code |
|---|---|
| 2682 | * |
| 2683 | * If the site is set to display right-to-left, the RTL stylesheet link |
| 2684 | * will be used instead. |
| 2685 | * |
| 2686 | * @since 2.3.0 |
| 2687 | * |
| 2688 | * @param string $file Style handle name or filename (without ".css" extension) |
| 2689 | * relative to wp-admin/. Defaults to 'wp-admin'. |
| 2690 | */ |
| 2691 | echo apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . esc_url( wp_admin_css_uri( $file ) ) . "' type='text/css' />\n", $file ); |
| 2692 | |
| 2693 | if ( function_exists( 'is_rtl' ) && is_rtl() ) { |
| 2694 | /** This filter is documented in wp-includes/general-template.php */ |
| 2695 | echo apply_filters( 'wp_admin_css', "<link rel='stylesheet' href='" . esc_url( wp_admin_css_uri( "$file-rtl" ) ) . "' type='text/css' />\n", "$file-rtl" ); |
| 2696 | } |
| 2697 | } |
| 2698 | |
| 2699 | /** |
| 2700 | * Enqueues the default ThickBox js and css. |
| 2701 | * |
| 2702 | * If any of the settings need to be changed, this can be done with another js |
| 2703 | * file similar to media-upload.js. That file should |
| 2704 | * require array('thickbox') to ensure it is loaded after. |