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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 |
|---|---|
| 1916 | */ |
| 1917 | function wp_admin_css_uri( $file = 'wp-admin' ) { |
| 1918 | if ( defined('WP_INSTALLING') ) { |
| 1919 | $_file = "./$file.css"; |
| 1920 | } else { |
| 1921 | $_file = admin_url("$file.css"); |
| 1922 | } |
| 1923 | $_file = add_query_arg( 'version', get_bloginfo( 'version' ), $_file ); |
| 1924 | |
| 1925 | return apply_filters( 'wp_admin_css_uri', $_file, $file ); |
| 1926 | } |
| 1927 | |
| 1928 | /** |
| 1929 | * Enqueues or directly prints a stylesheet link to the specified CSS file. |
| 1930 | * |
| 1931 | * "Intelligently" decides to enqueue or to print the CSS file. If the |
| 1932 | * 'wp_print_styles' action has *not* yet been called, the CSS file will be |
| 1933 | * enqueued. If the wp_print_styles action *has* been called, the CSS link will |
| 1934 | * be printed. Printing may be forced by passing TRUE as the $force_echo |