結(jié)合使用PHP和RSS
Jun 08, 2016 pm 05:32 PM內(nèi)容摘要:RSS 聚合最近非常流行,因此至少對 RSS 及其工作方式有所了解是一名 PHP 開發(fā)人員的迫切需要。本文介紹了 RSS 基礎(chǔ)知識(shí)、RSS 眾多用途中的一些用途、如何使用 PHP 從數(shù)據(jù)庫創(chuàng)建 RSS 提要,以及如何使用 XML_RSS 模塊讀取現(xiàn)有 RSS 提要并將其轉(zhuǎn)換為 HTML。
什么?您沒聽說過 RSS?
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RSS 聚合是最常見的 TLA(三字母縮寫詞)之一。RSS 作為縮寫詞具有多種含義,但是當(dāng)前的標(biāo)準(zhǔn)含義是:真正簡單的聚合。這是對這一極為常見、極為有用的標(biāo)準(zhǔn)的最新解釋。
回想 Internet 早期,一個(gè)稱為 Pointcast 的軟件將數(shù)據(jù) 推送 到用戶計(jì)算機(jī)上的屏幕保護(hù)應(yīng)用程序上,來提供各種新聞更新。最終,瀏覽器開發(fā)商(例如 Netscape 和 Microsoft)創(chuàng)建了類似這種非常流行的服務(wù)的東西。Netscape 開發(fā)了接受程度最高的變體,此變體后來被發(fā)布到 Internet 開發(fā)環(huán)境中,并最終發(fā)展成了現(xiàn)在的 RSS。
RSS 將最近更新的信息分發(fā)給許多接收者,非常類似廣播系統(tǒng)。如果您擁有大量的用戶,那么 RSS 提要就像燈塔一樣吸引您的用戶回來查看更新。因?yàn)?RSS 提供了一種急需的維持用戶注意力的方法,所以 RSS 越來越流行并為越來越多的內(nèi)容提供者所使用就沒什么好奇怪的了。
當(dāng)您看到圖 1 中所示的圖標(biāo)時(shí),您就可以確定此站點(diǎn)提供 RSS 提要。事實(shí)上,此圖標(biāo)是表示一個(gè)站點(diǎn)針對內(nèi)容更新提供 RSS 服務(wù)的標(biāo)準(zhǔn)圖標(biāo)。圖標(biāo)中的曲線代表無線電波,象征著 RSS 提要的廣播本質(zhì)。
圖 1. RSS 標(biāo)準(zhǔn)圖標(biāo)
RSS 應(yīng)用程序
相當(dāng)多的應(yīng)用程序(其中許多是免費(fèi)的)能夠閱讀 RSS 提要,其中許多允許用戶聚合提要。聚合特性甚至允許用戶進(jìn)一步改進(jìn)所收到內(nèi)容的數(shù)量和性質(zhì)。每種閱讀器都擁有不同的特性,旨在幫助管理來自 Internet 的難以置信的信息量。
Mozilla 公司的 Thunderbird 和 Firefox、Microsoft 公司的 Internet Explorer 7 和即將推出的 Office 版本以及許多其他產(chǎn)品是最接近您的搜索引擎的一些例子。在這么多種獲取和閱讀提要的方法中,您應(yīng)該可以找到適合您的方法。當(dāng)然,除非您是一位眼光挑剔的軟件開發(fā)人員,希望編寫您自己的程序!本文馬上就要對此進(jìn)行介紹!
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我如何使用 RSS?
您的站點(diǎn)包含您希望公布給大眾的內(nèi)容,這是您將內(nèi)容發(fā)布到 Internet 的首要原因。如果很多用戶知道您的站點(diǎn)和內(nèi)容,他們會(huì)每天回來查看更新嗎?恐怕不會(huì)。在您經(jīng)常訪問的站點(diǎn)中,您會(huì)每天訪問它們來檢查更新嗎?恐怕不會(huì)。這就是 RSS 產(chǎn)生的原因。
對于您的用戶來說,RSS 可能是一個(gè)巨大的獲益,當(dāng)他們認(rèn)為您的站點(diǎn)上列出的觀點(diǎn)或新聞?dòng)袃r(jià)值時(shí)尤其如此。用戶無需頻繁返回您的站點(diǎn),即可準(zhǔn)確了解您進(jìn)行的更新或添加的內(nèi)容,從而使用戶能夠節(jié)省時(shí)間和精力,同時(shí)也不會(huì)錯(cuò)過任何更新!
如果您整合 RSS 提要來支持您自己站點(diǎn)的內(nèi)容聚合,那么生成內(nèi)容不是問題。如果您從提要中拉出數(shù)據(jù)并將其包括在您的站點(diǎn)中,那么只需很少的時(shí)間投資就能為您的站點(diǎn)添加大量的內(nèi)容。

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