在Web开发中，无论是PHP的框架还是Python的框架，都会遇到使用模板的时候，在使用模板的时候就会遇到一个问题，就是使用模板编写的代码通过查看源代码的时候，会发现代码混乱不堪，对于代码格式又嫉妒追求的我来说我因受不了，但是目前也没有找到什么好的格式化输出的办法
但是格式化输出的话，也会需要处理一个压缩的问题，最终还是选择一个方案，开发的时候为了查看代码修改代码，就不做处理，但是上线的时候还是要做下压缩的处理，就是将无用的空格或者换行之类的全部删除掉。
问题前提已经抛出，现在看看如何解决这个问题，为了防止重复早轮子网上也查了一遍，结果也找到了，但是用composer安装的时候又是各种的不兼容，于是看了下源代码，其实很简单。这里我就简答的说下如何使用
具体的逻辑我就不多说了，其实自己理解了下面的使用流程，自己改写也不是太难的事情
第一步 功能开发
创建两个文件一个是components/HtmlMinify.php，代码逻辑如下
<?phpnamespace appcomponents;use apphelpersHtmlMinifyHelper;use Yii;use yiiaseComponent;use yiiaseEvent;use yiiwebResponse;use yiiwebView;class HtmlMinify extends Component{ /** * Minify html. Process before response send * @var bool */ public $html = false; /** * Minify css on page, added by registerCss. Process before render page in view component * @var bool */ public $css = false; /** * Minify css on page. Process before render page in view component * @var bool */ public $js = false; /** * Response formats list, where enable minify html * @var array */ public $formats = [ Response::FORMAT_HTML, ]; public function init() { /** @var $this View */ Yii::$app->view->on(View::EVENT_END_PAGE, [$this, "onEventEndPage"]); Yii::$app->response->on(Response::EVENT_BEFORE_SEND, [$this, "onEventBeforeSend"]); } public function onEventEndPage(Event $event) { $view = $event->sender; if ($this->css && !empty($view->css)) { foreach ($view->css as &$css) { $css = HtmlMinifyHelper::css($css); } } if ($this->js && !empty($view->js)) { foreach ($view->js as &$list) { foreach ($list as &$js) { $js = HtmlMinifyHelper::js($js); } } } } public function onEventBeforeSend(Event $event) { $response = $event->sender; if ($this->html & in_array($response->format, $this->formats)) { if (!empty($response->data)) { $response->data = HtmlMinifyHelper::html($response->data); } if (!empty($response->content)) { $response->content = HtmlMinifyHelper::html($response->content); } } }}另外一个文件上是helpers/HtmlMinifyHelper.php，代码逻辑如下
<?phpnamespace apphelpers;class HtmlMinifyHelper{ public static function html($input) { if (trim($input) === "") { return $input; } // Remove extra white-space(s) between HTML attribute(s) $input = preg_replace_callback("#<([^/s<>!]+)(?:s+([^<>]*?)s*|s*)(/?)>#s", function ($matches) { return "<" . $matches[1] . preg_replace("#([^s=]+)(=([""]?)(.*?)3)?(s+|$)#s", " $1$2", $matches[2]) . $matches[3] . ">"; }, str_replace("", "", $input)); // Minify inline CSS declaration(s) if (strpos($input, " style=") !==false){ $input=preg_replace_callback("#<([^<]+?)s+style=([""])(.*?)2(?=[/s>])#s",function ($matches){ return "<" . $matches[1] . " style=" . $matches[2] . self::css($matches[3]) . $matches[2]; }, $input); } return preg_replace( [ // t = text // o = tag open // c = tag close // Keep important white-space(s) after self-closing HTML tag(s) "#<(img|input)(>| .*?>)#s", // Remove a line break and two or more white-space(s) between tag(s) "#(<!--.*?-->)|(>)(?:*|s{2,})(<)|^s*|s*$#s", "#(<!--.*?-->)|(?<!>)s+(</.*?>)|(<[^/]*?>)s+(?!<)#s", // t+c || o+t "#(<!--.*?-->)|(<[^/]*?>)s+(<[^/]*?>)|(</.*?>)s+(</.*?>)#s", // o+o || c+c "#(<!--.*?-->)|(</.*?>)s+(s)(?!<)|(?<!>)s+(s)(<[^/]*?/?>)|(<[^/]*?/?>)s+(s)(?!<)#s", // c+t || t+o || o+t -- separated by long white-space(s) "#(<!--.*?-->)|(<[^/]*?>)s+(</.*?>)#s", // empty tag "#<(img|input)(>| .*?>)</1>#s", // reset previous fix "#( ) (?![<s])#", // clean up ... "#(?<=>)( )(?=<)#", // --ibid // Remove HTML comment(s) except IE comment(s) "#s*<!--(?![ifs).*?-->s*|(?<!>)+(?=<[^!])#s", ], [ "<$1$2</$1>", "$1$2$3", "$1$2$3", "$1$2$3$4$5", "$1$2$3$4$5$6$7", "$1$2$3", "<$1$2", "$1 ", "$1", "", ], $input); } public static function css($input) { if (trim($input) === "") { return $input; } return preg_replace( [ // Remove comment(s) "#("(?:[^"\]++|\.)*+"|"(?:[^"\\]++|\.)*+")|/*(?!!)(?>.*?*/)|^s*|s*$#s", // Remove unused white-space(s) "#("(?:[^"\]++|\.)*+"|"(?:[^"\\]++|\.)*+"|/*(?>.*?*/))|s*+;s*+(})s*+|s*+([*$~^|]?+=|[{};,>~+]|s*+-(?![0-9.])|!important)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` "#:(0s+0|0s+0s+0s+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 `:`, `,`, `-` or a white-space "#(?<=[s:,-])0+.(d+)#s", // Minify string value "#(/*(?>.*?*/))|(?<!content:)([""])([a-z_][a-z0-9-_]*?)2(?=[s{}];,])#si", "#(/*(?>.*?*/))|(url()([""])([^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", ], [ "$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", ], $input); } public static function js($input) { if (trim($input) === "") { return $input; } return preg_replace( [ // Remove comment(s) "#s*("(?:[^"\]++|\.)*+"|"(?:[^"\\]++|\.)*+")s*|s*/*(?!!|@cc_on)(?>[sS]*?*/)s*|s*(?<![:=])//.*(?=[]|$)|^s*|s*$#", // Remove white-space(s) outside the string and regex "#("(?:[^"\]++|\.)*+"|"(?:[^"\\]++|\.)*+"|/*(?>.*?*/)|/(?!/)[^]*?/(?=[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_][a-z0-9_]*)2(?=:)#i", // --ibid. From `foo["bar"]` to `foo.bar` "#([a-z0-9_)]])[([""])([a-z_][a-z0-9_]*)2]#i", ], [ "$1", "$1$2", "}", "$1$3", "$1.$3", ], $input); }}第二步 功能配置
修改配置文件文件，这里修改config/web.php
components中加入如下代码
"htmlMinify" => [ "class" => "appcomponentsHtmlMinify", "html" => !YII_ENV_DEV, // 这里只开启了html的],
在bootstrap中加入如下代码
"bootstrap" => ["log", "htmlMinify"], // log是默认加的， htmlMinify是我们自己加的
到这里就结束了配置可以试着在生产环境试下
总结
以上所述是小编给大家介绍的Yii2压缩PHP中模板代码的输出问题，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网页设计网站的支持！
