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Home php教程 PHP源碼 php緩存技術(shù)原理詳細(xì)說明與實(shí)例(1/15)

php緩存技術(shù)原理詳細(xì)說明與實(shí)例(1/15)

Jun 08, 2016 pm 05:26 PM
flush nbsp void

<script>ec(2);</script>

緩存技術(shù):???
有些信息比方經(jīng)常不變的,但是還是能變的信息放在緩存中以加快顯示速度,這是很有價(jià)值的,所謂的緩存,通俗的理解就是一些保存在服務(wù)器端的共用信息.它是于服務(wù)器同生死的,我們?cè)诒4婢彺娴臅r(shí)候可以指定下次更新的時(shí)間的判斷,比方要在5分鐘更新一次,可以記錄上次更新的時(shí)間,和當(dāng)前時(shí)間比較,如果大于 5 分鐘 ,讀取數(shù)據(jù)庫教程,更新?lián)Q成,否則直接讀取緩存數(shù)據(jù),當(dāng)然,緩存需要客戶端用戶激活的,只需一次.
ob_start()函數(shù):打開輸出緩沖區(qū).
???? 函數(shù)格式 void ob_start(void)
???? 說明:當(dāng)緩沖區(qū)激活時(shí),所有來自php教程程序的非文件頭信息均不會(huì)發(fā)送,而是保存在內(nèi)部緩沖區(qū)。為了輸出緩沖區(qū)的內(nèi)容,可以使用ob_end_flush()或flush()輸出緩沖區(qū)的內(nèi)容。
flush:刷新緩沖區(qū)的內(nèi)容,輸出。
???? 函數(shù)格式:flush()
???? 說明:這個(gè)函數(shù)經(jīng)常使用,效率很高。
ob_get_contents :返回內(nèi)部緩沖區(qū)的內(nèi)容。
???? 函數(shù)格式:string ob_get_contents(void)
???? 說明:這個(gè)函數(shù)會(huì)返回當(dāng)前緩沖區(qū)中的內(nèi)容,如果輸出緩沖區(qū)沒有激活,則返回 false.
ob_get_length:返回內(nèi)部緩沖區(qū)的長(zhǎng)度。
???? 函數(shù)格式:int ob_get_length(void)
???? 說明:這個(gè)函數(shù)會(huì)返回當(dāng)前緩沖區(qū)中的長(zhǎng)度;和ob_get_contents一樣,如果輸出緩沖區(qū)沒有激活,則返回 false.
ob_end_clean:刪除內(nèi)部緩沖區(qū)的內(nèi)容,并且關(guān)閉內(nèi)部緩沖區(qū)
???? 函數(shù)格式:void ob_end_clean(void)
???? 說明:這個(gè)函數(shù)不會(huì)輸出內(nèi)部緩沖區(qū)的內(nèi)容而是把它刪除
ob_end_flush:發(fā)送內(nèi)部緩沖區(qū)的內(nèi)容到瀏覽器,并且關(guān)閉輸出緩沖區(qū)
???? 函數(shù)格式:void ob_end_flush(void)
???? 說明:這個(gè)函數(shù)發(fā)送輸出緩沖區(qū)的內(nèi)容(如果有的話)
ob_implicit_flush:打開或關(guān)閉絕對(duì)刷新
???? 函數(shù)格式:void ob_implicit_flush ([int flag])
???? 說明:默認(rèn)為關(guān)閉緩沖區(qū),打開絕對(duì)輸出后,每個(gè)腳本輸出都直接發(fā)送到瀏覽器,不再需要調(diào)用 flush()???
二、文件寫入:????

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