[\s\S]*?\*\/)\s*|\s*(?.*?\*\/)|\/(?!\/)[^\n\r]*?\/(?=[\s.,;]|[gimuy]|$))|\s*([!%&*\(\)\-=+\[\]\{\}|;:,.<>?\/])\s*#s', // Remove the last semicolon '#;+\}#', // Minify object attribute(s) except JSON attribute(s). From `{'foo':'bar'}` to `{foo:'bar'}` '#([\{,])([\'])(\d+|[a-z_]\w*)\2(?=\:)#i', // --ibid. From `foo['bar']` to `foo.bar` '#([\w\)\]])\[([\'"])([a-z_]\w*)\2\]#i', // Replace `true` with `!0` '#(?<=return |[=:,\(\[])true\b#', // Replace `false` with `!1` '#(?<=return |[=:,\(\[])false\b#', // Clean up ... '#\s*(\/\*|\*\/)\s*#' ), array( '$1', '$1$2', '}', '$1$3', '$1.$3', '!0', '!1', '$1' ), $input); } /* * Function to minify CSS * */ function apcw_minify_css( $input ) { if(trim($input) === "") return $input; // Force white-space(s) in `calc()` if(strpos($input, 'calc(') !== false) { $input = preg_replace_callback('#(?<=[\s:])calc\(\s*(.*?)\s*\)#', function($matches) { return 'calc(' . preg_replace('#\s+#', "\x1A", $matches[1]) . ')'; }, $input); } return preg_replace( array( // Remove comment(s) '#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')|\/\*(?!\!)(?>.*?\*\/)|^\s*|\s*$#s', // Remove unused white-space(s) '#("(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\'|\/\*(?>.*?\*\/))|\s*+;\s*+(})\s*+|\s*+([*$~^|]?+=|[{};,>~+]|\s*+-(?![0-9\.])|!important\b)\s*+|([[(:])\s++|\s++([])])|\s++(:)\s*+(?!(?>[^{}"\']++|"(?:[^"\\\]++|\\\.)*+"|\'(?:[^\'\\\\]++|\\\.)*+\')*+{)|^\s++|\s++\z|(\s)\s+#si', // Replace `0(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)` with `0` '#(?<=[\s:])(0)(cm|em|ex|in|mm|pc|pt|px|vh|vw|%)#si', // Replace `:0 0 0 0` with `:0` '#:(0\s+0|0\s+0\s+0\s+0)(?=[;\}]|\!important)#i', // Replace `background-position:0` with `background-position:0 0` '#(background-position):0(?=[;\}])#si', // Replace `0.6` with `.6`, but only when preceded by a white-space or `=`, `:`, `,`, `(`, `-` '#(?<=[\s=:,\(\-]|&\#32;)0+\.(\d+)#s', // Minify string value '#(\/\*(?>.*?\*\/))|(?.*?\*\/))|(\burl\()([\'"])([^\s]+?)\3(\))#si', // Minify HEX color code '#(?<=[\s=:,\(]\#)([a-f0-6]+)\1([a-f0-6]+)\2([a-f0-6]+)\3#i', // Replace `(border|outline):none` with `(border|outline):0` '#(?<=[\{;])(border|outline):none(?=[;\}\!])#', // Remove empty selector(s) '#(\/\*(?>.*?\*\/))|(^|[\{\}])(?:[^\s\{\}]+)\{\}#s', '#\x1A#' ), array( '$1', '$1$2$3$4$5$6$7', '$1', ':0', '$1:0 0', '.$1', '$1$3', '$1$2$4$5', '$1$2$3', '$1:0', '$1$2', ' ' ), $input); } } $obj = new Apcw_Plugin_Assets; $obj->init();