as we know css is key role for web page,<\/p>\n
wordpress using wp_admin_css(‘install’, true);<\/strong> to print link css. the most important statement.<\/p>\n “<link rel=’$rel’ id=’$handle-css’ $title href=’$href’ type=’text\/css’ media=’$media’ \/>\\n” will be replaced Let’s look at what define of apply_filters, “apply_filters($tag,$value)”. ‘style_loader_tag’ has nothing in global variable $wp_filter.<\/p>\n Therefore, apply_filters do nothing here, it only return second param as string to print.<\/p>\n as we know css is key role for web page, wordpress using wp_admin_css(‘install’, true); to print link css. in format of <link href=’…\/xxx.css’> the most important statement. $tag = apply_filters( ‘style_loader_tag’, “\\n”, $handle, $href, $media); “<link rel=’$rel’ id=’$handle-css’ $title href=’$href’ type=’text\/css’ media=’$media’ \/>\\n” will be replaced to be ‘<link rel=’stylesheet’ id=’install-css’ href=’http:\/\/localhost:8082\/wordpress2\/wp-admin\/css\/install.min.css?ver=4.7.2′ type=’text\/css’ media=’all’ \/> […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-366","post","type-post","status-publish","format-standard","hentry","category-wordpress"],"_links":{"self":[{"href":"http:\/\/emacslisp.com\/index.php?rest_route=\/wp\/v2\/posts\/366","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/emacslisp.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/emacslisp.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/emacslisp.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/emacslisp.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=366"}],"version-history":[{"count":10,"href":"http:\/\/emacslisp.com\/index.php?rest_route=\/wp\/v2\/posts\/366\/revisions"}],"predecessor-version":[{"id":376,"href":"http:\/\/emacslisp.com\/index.php?rest_route=\/wp\/v2\/posts\/366\/revisions\/376"}],"wp:attachment":[{"href":"http:\/\/emacslisp.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=366"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/emacslisp.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=366"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/emacslisp.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=366"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\nin format of <link href=’…\/xxx.css’> <\/p>\n \r\n$tag = apply_filters( 'style_loader_tag', \"\\n\", $handle, $href, $media);\r\n<\/pre>\n
\nto be ‘<link rel=’stylesheet’ id=’install-css’ href=’http:\/\/localhost:8082\/wordpress2\/wp-admin\/css\/install.min.css?ver=4.7.2′ type=’text\/css’ media=’all’ \/><\/p>\n \r\necho $conditional_pre;\r\necho $tag;\r\n$this->print_inline_style( $handle );\r\necho $conditional_post;\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"