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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 |
|---|---|
| 4621 | * |
| 4622 | * If the site is set to display right-to-left, the RTL stylesheet link |
| 4623 | * will be used instead. |
| 4624 | * |
| 4625 | * @since 2.3.0 |
| 4626 | * @param string $stylesheet_link HTML link element for the stylesheet. |
| 4627 | * @param string $file Style handle name or filename (without ".css" extension) |
| 4628 | * relative to wp-admin/. Defaults to 'wp-admin'. |
| 4629 | */ |
| 4630 | echo apply_filters( 'wp_admin_css', $stylesheet_link, $file ); |
| 4631 | |
| 4632 | if ( function_exists( 'is_rtl' ) && is_rtl() ) { |
| 4633 | $rtl_stylesheet_link = sprintf( |
| 4634 | "<link rel='stylesheet' href='%s' type='text/css' />\n", |
| 4635 | esc_url( wp_admin_css_uri( "$file-rtl" ) ) |
| 4636 | ); |
| 4637 | |
| 4638 | /** This filter is documented in wp-includes/general-template.php */ |
| 4639 | echo apply_filters( 'wp_admin_css', $rtl_stylesheet_link, "$file-rtl" ); |
| 4640 | } |
| 4641 | } |
| 4642 | |
| 4643 | /** |
| 4644 | * Enqueues the default ThickBox js and css. |
| 4645 | * |
| 4646 | * If any of the settings need to be changed, this can be done with another js |
| 4647 | * file similar to media-upload.js. That file should |
| 4648 | * require array('thickbox') to ensure it is loaded after. |