{"id":5869,"date":"2010-12-22T14:30:23","date_gmt":"2010-12-22T13:30:23","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=5869"},"modified":"2024-08-12T08:12:02","modified_gmt":"2024-08-12T08:12:02","slug":"gestione-css-avanzata-parte-3","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/sviluppo\/gestione-css-avanzata-parte-3\/","title":{"rendered":"Gestione CSS avanzata: Parte 3"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-5519\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/11\/css1.jpg\" alt=\"css\" width=\"100\" height=\"100\">Proseguendo con il nostro tutorial \u00e8 giunto il momento di ottimizzare un po&#8217; le prestazioni aggiungendo la gestione della cache.<\/p>\n<p>Come accennato in precedenza, dobbiamo tenere conto di 2 tipi di cache:<\/p>\n<ol>\n<li>Cache <strong>lato browser<\/strong> per ridurre il numero delle richieste<\/li>\n<li>Cache <strong>lato server<\/strong> del css precompilato<\/li>\n<\/ol>\n<h3>Cache lato browser<\/h3>\n<p>Forniremo 3 <a href=\"http:\/\/www.w3.org\/Protocols\/rfc2616\/rfc2616-sec14.html\">header al browser<\/a> per fargli fare cache del nostro css finale:<\/p>\n<ol>\n<li>Last-Modified: utilizzando la data di ultima modifica del file modificato pi\u00f9 di recente tra quelli richiesti<\/li>\n<li><a href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-la-cache-dei-browser-con-gli-etag-in-php\">Etag<\/a>: utilizzando la data di ultima modifica e la dimensione di tutti i file richiesti<\/li>\n<li>Expires<\/li>\n<\/ol>\n<p>Potrebbe sembrare superfluo l&#8217;uso degli header Etag\/Last-Modified insieme a Expires, ma \u00e8 comunque conveniente utilizzare entrambi combinatamente.<br \/>\nUna risorsa che viene immagazzinata in cache tramite header Expires <strong>non genera nessuna richiesta HTTP<\/strong> da parte del browser, a differenza della risorsa Etag che genera sempre una richiesta e se il contenuto non \u00e8 stato modificato, <strong>non scarica alcun dato oltre agli header<\/strong> della risposta.<\/p>\n<p><a href=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/12\/flowchartcachebrowser.png\"><img fetchpriority=\"high\" decoding=\"async\" class=\"aligncenter size-full wp-image-5870\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/12\/flowchartcachebrowser.png\" alt=\"Flow Chart Cache Browser\" width=\"619\" height=\"495\"><\/a><\/p>\n<p>La prima cosa da fare quindi \u00e8 leggere data di ultima modifica e dimensione di ogni file richiesto e genero un etag aggregando i dati. Per l&#8217;header Last-Modified invece utilizzo solo la data di modifica pi\u00f9 recente tra quella dei file richiesti.<\/p>\n<p>[php]<br \/>\n\/\/[&#8230;]<br \/>\n$files = explode(&#8216; &#8216;,$_GET[&#8216;f&#8217;]);<\/p>\n<p>$etagdata = array();<br \/>\n$lastmtime = 0;<br \/>\nforeach ($files as $file) {<br \/>\n$file = trim($file);<br \/>\n$template = &#8220;css\/$file.ccss&#8221;;<br \/>\nif (!$s-&gt;templateExists($template))<br \/>\n$template = &#8220;css\/$file.css&#8221;;<br \/>\n$template_file = $s-&gt;template_dir.DIRECTORY_SEPARATOR.$template;<br \/>\nif ($s-&gt;templateExists($template)) {<br \/>\n$mtime = filemtime($template_file);<br \/>\n$etagdata[] = $mtime;<br \/>\n$etagdata[] = filesize($template_file);<br \/>\nif ($mtime&gt;$lastmtime)<br \/>\n$lastmtime = $mtime;<br \/>\n}<br \/>\n}<\/p>\n<p>\/\/ Calcolo un etag e lo comunico al client<br \/>\n$modtime = gmdate(&#8216;r&#8217;, $lastmtime);<br \/>\n$etagdata = implode(&#8216;:&#8217;, $etagdata);<br \/>\n$etagdata = md5($etagdata.&#8217;:&#8217;.$modtime);<br \/>\n$etag = &#8220;\\\\&#8221;$etagdata\\\\&#8221;&#8221;;<br \/>\nheader(&#8220;Last-Modified: $modtime&#8221;);<br \/>\nheader(&#8220;Etag: $etag&#8221;);<br \/>\n\/\/ Impostiamo anche una data di scadenza per ridurre le richieste, ma nel futuro prossimo (4H) dato che abbiamo anche gli ETag<br \/>\nheader(&#8216;Expires: &#8216; . gmdate(&#8216;D, d M Y H:i:s&#8217;, time()+14400) . &#8216; GMT&#8217;);<\/p>\n<p>\/\/ Verifico l&#8217;etag richiesto dal client ed eventualmente interrompo lo script<br \/>\nif (<br \/>\n(!empty($_SERVER[&#8216;HTTP_IF_MODIFIED_SINCE&#8217;]) &amp;&amp; $_SERVER[&#8216;HTTP_IF_MODIFIED_SINCE&#8217;]==$modtime)<br \/>\n||<br \/>\n(!empty($_SERVER[&#8216;HTTP_IF_NONE_MATCH&#8217;]) &amp;&amp; $_SERVER[&#8216;HTTP_IF_NONE_MATCH&#8217;]==$etag)<br \/>\n) {<br \/>\nheader(&#8216;HTTP\/1.1 304 Not Modified&#8217;);<br \/>\nheader(&#8216;Content-Length: 0&#8217;);<br \/>\nexit;<br \/>\n}<br \/>\n[\/php]<\/p>\n<p>Come tocco finale aggiungiamo anche la compressione gzip dei contenuti:<\/p>\n<p>[php]<br \/>\nif (isset($_SERVER[&#8216;HTTP_ACCEPT_ENCODING&#8217;]) &amp;&amp; strpos($_SERVER[&#8216;HTTP_ACCEPT_ENCODING&#8217;], &#8216;gzip&#8217;) !== false)<br \/>\nob_start(&#8216;ob_gzhandler&#8217;);<br \/>\n[\/php]<\/p>\n<h3>Cache lato server<\/h3>\n<p>Il nostro obiettivo \u00e8 di evitare di processare i file sorgenti ogni volta, ma farlo solo quando questi vengono modificati.<br \/>\nPer farlo salviamo il file finale in un file di cache e impostiamo la sua data di ultima modifica all&#8217;ultima data di modifica dei file sorgenti.<br \/>\nAlle richieste successive verifichiamo che questo file esista e che la sua data di modifica non sia inferiore a quella dei file sorgenti e in tal caso serviamo il file precompilato.<\/p>\n<p>[php]<br \/>\n\/\/cache dir<br \/>\nif (!file_exists(&#8220;$basedir\/cache\/css&#8221;)) {<br \/>\nmkdir(&#8220;$basedir\/cache\/css&#8221;);<br \/>\nchmod(&#8220;$basedir\/cache\/css&#8221;, 0777);<br \/>\n}<\/p>\n<p>$cachefile = &#8220;$basedir\/cache\/css\/$etagdata.css&#8221;;<br \/>\nif (!file_exists($cachefile) || filemtime($cachefile)&lt;$lastmtime) {<\/p>\n<p>$csscontent = &#8220;&#8221;;<br \/>\nforeach ($files as $file) {<br \/>\n$template = &#8220;css\/$file.ccss&#8221;;<br \/>\n\/\/ Se il file non esiste tra i CCSS (CleanCSS), allora lo cerco come CSS normale<br \/>\nif (!$s-&gt;templateExists($template)) {<br \/>\n$template = &#8220;css\/$file.css&#8221;;<br \/>\n$csscontent .= &#8220;\/* $file.css *\/\\\\n&#8221;;<br \/>\n$csscontent .= trim($s-&gt;fetch($template)).&#8221;\\\\n&#8221;;<br \/>\n} else {<br \/>\n$csscontent .= &#8220;\/* $file.ccss *\/\\\\n&#8221;;<br \/>\n$csscontent .= CleanCSS::convertString($s-&gt;fetch($template)).&#8221;\\\\n&#8221;;<br \/>\n}<br \/>\n}<\/p>\n<p>file_put_contents($cachefile, $csscontent);<br \/>\nchmod($cachefile, 0666);<br \/>\ntouch($cachefile, $lastmtime);<br \/>\necho $csscontent;<br \/>\n} else {<br \/>\necho file_get_contents($cachefile);<br \/>\n}<br \/>\n[\/php]<\/p>\n<p>I file precompilati andranno a finire nella cartella cache\/css e ricordiamoci quindi di cancellarli se per qualsiasi motivo dobbiamo forzarne la rigenerazione.<\/p>\n<p>Il codice sorgente completo \u00e8 disponibile per il download. Come per la puntata precedente mi raccomando di assicurarvi di dare i permessi di scrittura alla cartella cache.<\/p>\n<p>Col prossimo articolo si concluder\u00e0 la serie sulla gestione avanzata dei css aggiungendo la <strong>generazione dinamica delle varianti delle regole<\/strong> e la <strong>minificazione del codice<\/strong>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-5519\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/11\/css1.jpg\" alt=\"css\" width=\"100\" height=\"100\" \/>Proseguendo con il <a href=\"\/it\/blog\/tag\/css-avanzato\">nostro tutorial<\/a> \u00e8 giunto il momento di ottimizzare un po&#8217; le prestazioni aggiungendo la gestione della cache.<\/p>\n<p>Come accennato nei post precedenti, dovremo tenere in considerazione due diversi tipi di cache.<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[108],"tags":[179,127,202,697,63,160,161],"class_list":["post-5869","post","type-post","status-publish","format-standard","hentry","category-sviluppo","tag-cache","tag-css","tag-css-avanzati","tag-css-avanzato","tag-php","tag-smarty","tag-smarty-3"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u2022 Gestione CSS avanzata: Parte 3 - Sviluppo - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Gestione CSS avanzata: Parte 3. 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