


Simple analysis of the running process of the PHP program, analysis of the PHP process
Jul 06, 2016 pm 02:24 PM簡單解析PHP程序的運行流程,解析php流程
一直想了解Web編程的技術。PHP是進行Web編程重要的一種語言,書上總是說,PHP是用于服務器端的編程語言。但是,實在不能理解它是怎么用于服務器端編程,如何被運行。也看過一些PHP的教程,大多是介紹語法,卻沒有給出前面的問題解答。最近東拼西湊的看了一些東西,終于對PHP如何運行有了一些了解。
HTTP協(xié)議與PHP腳本的觸發(fā)
HTTP是一種基于Request/Response的協(xié)議,是支持Web運行的協(xié)議基礎。HTTP的客戶端發(fā)送Request
到服務器端,服務器端返回Response。Request中包含客戶端需要訪問的頁面的文件名。服務器端返回該文件名指向的網(wǎng)頁。如果沒有使用PHP、JavaScript等,HTTP協(xié)議傳輸只能是靜態(tài)的HTML文件。也就是,HTML文件不會受到用戶行為的影響,內容一直保持不變。
如果要實現(xiàn)動態(tài)網(wǎng)頁,就需要使用PHP或JavaScript。PHP是用于服務器端的編程語言,JavaScript是多用于客戶端的編程語言。
PHP代碼是在服務器端被執(zhí)行的。用戶訪問一個包含PHP代碼的網(wǎng)頁時,發(fā)送Request到服務器,其中包含網(wǎng)頁的文件名。服務器收到Request后,找到文件名指向的文件,發(fā)現(xiàn)其中嵌有PHP代碼,會調用PHP解釋器處理該文件,然后將處理后的結果整理到Response,發(fā)送到客戶端。PHP代碼可以與服務器端的數(shù)據(jù)庫或其他資源進行交互,或者根據(jù)用戶的操作產生不同的頁面。
因此,PHP腳本的觸發(fā)是在服務器收到客戶端的Request。收到一個Request后,服務器觸發(fā)一個PHP腳本;處理完腳本后,返回結果到客戶端,等待下一個Request。當收到下一個Request后,服務器觸發(fā)另一個(或同一個)PHP腳本。兩次PHP腳本的運行是相互獨立的,第二次腳本的運行幾乎不受前一次腳本運行的影響。
JavaScript代碼一般是在客戶端被執(zhí)行的,即被瀏覽器所處理??蛻舳藦姆掌鞫双@取的是JavaScript代碼,而不是代碼被執(zhí)行后的結果,然后調用解釋器執(zhí)行該代碼。
PHP的代碼塊
PHP代碼是可以嵌入到HTML文件中的,經??梢栽贖TML文件中看到散落在各處的PHP代碼塊。我也一直困惑在同一個HMTL文件中,不同的PHP代碼塊之間是怎樣的關系。原來PHP是會忽略兩個PHP代碼塊之間HTML代碼的。
<head> <title>Test PHP Multiple Blocks</title> </head> <body> <p>This is HTML code.</p> <?php $var = 1; echo "<p>This is PHP code block 1. <br/> \$var=$var </p>"; ?> <p>This is HTML code too.</p> <?php $var += 1; echo "<p>This is PHP code block 2. <br/> \$var=$var</p>" ?> </body>
代碼中有兩個PHP代碼塊,它們被HTML代碼隔開了。第1個PHP代碼塊聲明了1個變量$var;第2個代碼塊引用$var,進行改變了它的值。用PHP執(zhí)行上述代碼,得到的輸出如下。
<head> <title>Test PHP Multiple Blocks</title> </head> <body> <p>This is HTML code.</p> <p>This is PHP code block 1. <br/> $var=1 </p> <p>This is HTML code too.</p> <p>This is PHP code block 2. <br/> $var=2</p> </body>
第2個代碼塊是可以引用$var的。雖然被HTML代碼隔開了,但是兩段代碼的執(zhí)行完全忽略了HTML部分。PHP的輸出與下面沒有被HTML隔開的PHP代碼是一樣的,前者只是在PHP輸出結果之間插入了相應的HTML代碼。
<?php $var = 1; echo "<p>This is PHP code block 1. <br/> \$var=$var </p>"; $var += 1; echo "<p>This is PHP code block 2. <br/> \$var=$var</p>" ?>

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