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Home php教程 php手冊 Shell Script方式的PHP(轉(zhuǎn)) 這種方式頗有點像PERL的CGI方式。。:)

Shell Script方式的PHP(轉(zhuǎn)) 這種方式頗有點像PERL的CGI方式。。:)

Jun 21, 2016 am 09:12 AM
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Shell Script方式的PHP

PHP 怎么這么紅??
最近 PHP(Personal Hypertext Preprocessor) 似乎已經(jīng)成了這一兩年來 Linux/Unix 上最廣為大家所使用的網(wǎng)頁處理語言﹐它的方便、強大功能與 OpenSource 的特性使得它正逐漸侵蝕到傳統(tǒng) CGI 甚至是 MicroSoft ASP(Active Server Page)的市場﹐幾乎各大網(wǎng)站征招人才莫不以會 PHP 作為基本條件。??
PHP 確實有這個資格可以這么紅﹐原因有下面數(shù)點 :??
PHP 是 OpenSource 軟件﹐完全免費﹐可以自由散布﹐因此吸引了極多的人來使用﹐也因為如此﹐吸引到了商業(yè)公司為其發(fā)展更好的引擎與最佳化軟件(請參考 http://www.zend.com/)。??
PHP 本身非常簡單易懂﹐淺顯的指令語法﹐外加一些基本的對象導(dǎo)向處理能力﹐讓新手足以在最短時間內(nèi)學(xué)會。??
PHP 提供了相當(dāng)多的功能﹐包含了數(shù)學(xué)處理、字符串處理、網(wǎng)絡(luò)相關(guān)功能、各種數(shù)據(jù)庫的支持、影像處理功能、有為數(shù)眾多的發(fā)展者正為 PHP 發(fā)展各式各樣的新功能﹐擴充性極佳。??
PHP 非常容易與 Apache 相結(jié)合﹐作為 Apache 的模塊來使用﹐設(shè)定安裝上相當(dāng)簡單﹐也因為 Apache 目前已經(jīng)占據(jù)了 Web Server 全球 60% 的市場﹐PHP 自然而然成為 Apache 最佳搭配。??
不過﹐這次要講的主題不是 PHP 在網(wǎng)頁設(shè)計上的應(yīng)用﹐而是 PHP 在 Shell Script 上的應(yīng)用﹐一般所知的 Shell Script 大約就是 tcsh、bash、perl 或是 python 這幾類語言﹐我所要談的就是將 PHP 當(dāng)成 Shell Script 來使用。??
PHP 執(zhí)行檔的安裝??
一般 PHP 作為網(wǎng)頁處理語言都是要編譯成 Apache 的模塊﹐這里當(dāng)然不么做﹐也因此編譯起來很簡單﹐只要以 root 的身分進行如下動作 :??
解開 php-3.0.xx.tar.gz??
cd php??
configure??
make??
編譯完之后﹐在 php 目錄下有一個可執(zhí)行檔﹐檔名為 php﹐將它 copy 到 /usr/local/bin 下即可。注意﹐如果檔案太大﹐可以使用 strip 指令將 php 的方式將不必要的信息去除﹐這樣檔案就會小得多了。??
第一個程序??
開始撰寫我們的第一個 PHP Shell Script 程序﹐這個例子印出 "Hello world !" :??
#!/usr/local/bin/php -q??
??
echo "Hello, world !";??
?>??
注意到 PHP 原本是應(yīng)用在網(wǎng)頁應(yīng)用的﹐因此它內(nèi)定會送出 HTML 的 HEADER﹐但是在此我們是要將 PHP 用作 Shell Script﹐"-q" 就是表示不要送出 HEADER 的意思﹐你可以試試看不加上 -q 的顯示結(jié)果。??
在這個例子中﹐/usr/local/bin/php 是表示要執(zhí)行 /usr/local/bin/ 下的 PHP﹐因為我們剛才將它裝在該處。echo 指令將 "Hello, world !" 印出﹐其中的 "" 字符是換行字符。??
注意到在將這個程序存成檔案后﹐須將其 chmod 成為可執(zhí)行屬性(chmod +x 文件名)﹐然后才能執(zhí)行喔。??
進階使用 I??
有時候我們需要在程序執(zhí)行時﹐送進一些參數(shù)﹐比如說 ls 這個指令﹐后面可以加上 -l 參數(shù)﹐PHP Shell Script 一樣也有支持這樣的用法﹐有兩個特殊的變量 : $argc 記錄著后面送入?yún)?shù)的個數(shù)﹐$argv[] 數(shù)組參數(shù)存著的則是參數(shù)的內(nèi)容。比如說我現(xiàn)在要設(shè)計一個算兩個數(shù)字總和的程序 :??
#!/usr/local/bin/php -q??
??
$sum=0;??
$sum=$sum+$argv[1]+$argv[2];??
echo $sum;??
?>??
假設(shè)將此程序命名為 sum.php3﹐則執(zhí)行 sum.php3 1 2 按下 enter 則會印出 3。??
如果要算出不特定個數(shù)的參數(shù)和﹐那么就得要用到 $argc 這個特殊變量了 :??
#!/usr/local/bin/php -q??
??
$sum=0;??
for ($t=1;$t$sum=$sum+$argv[$t];??
echo $sum;??
?>??
假設(shè)將此程序命名為 bigsum.php3﹐則執(zhí)行 bigsum.php3 1 2 3 4 5 按下 enter 則會印出 15﹐執(zhí)行 bigsum.php3 1 2 3 4 5 6 按下 enter 則會印出 21。??
有時候我們需要在程序執(zhí)行中輸入資料﹐但是 PHP 原本就是用于網(wǎng)頁設(shè)計﹐而網(wǎng)頁上的資料輸入自然都是用 FORM 的方式來輸入﹐所以這將 PHP 作為 Shell Script 時問題就來了﹐好在 PHP 有提供了開文件功能﹐而在 Linux/Uinx 之下﹐輸入(input)這件事原本就可以用開檔的方式來完成﹐我們要開啟的是 /dev/stdin 這個設(shè)備檔(stdin 是表示 standard input 的意思)﹐程序如下 :??
#!/usr/local/bin/php -q??
??
$fp=fopen("/dev/stdin","r");??
$inputstr=fgets($fp,100);??
fclose($fp);??

echo " ---------------------- ";??
echo $inputstr;??
?>??
其中的 fgets($fp,100) 是指從 $fp 這個檔案(也就是 "/dev/stdin")中讀取出 100 個 byte 的資料﹐程序執(zhí)行到這行便會停下來等待我們的輸入﹐當(dāng)我們輸入完按下 enter 之后﹐程序就會將剛才我們輸入的資料給印出來了。??
進階使用 II??
雖然已經(jīng)可以處理輸入﹐但是這樣的功能顯然還是太簡單﹐無法應(yīng)付更大的應(yīng)用﹐比如說我需要一個功能是將一串資料流(data stream)中的 HTML 給去除﹐這時便需要完整地處理輸出輸入轉(zhuǎn)向的能力﹐我們可以先設(shè)計程序如下 :??
#!/usr/local/bin/php -q??
??
$fp=fopen("/dev/stdin","r");??

while(!feof($fp)) {??
$c=fgetc($fp);??
$inputstr=$inputstr.$c;??
};??

fclose($fp);??

echo $inputstr;??
?>??
假設(shè)將此程序命名為 filt.php3﹐如果你直接執(zhí)行這個程序﹐它會一直等待你輸入﹐直到你按下 Ctrl+D 后才會將你的輸入資料給印出﹐我們可以這么執(zhí)行它 :??
more filt.php3 | filt.php3??
這樣的做法是將 filt.php3 這個程序用 more 給秀出并轉(zhuǎn)向給 filt.php3 這個程序﹐filt.php3 會不斷接受資料(事實上就是 filt.php3 程序代碼本身)﹐最后將其印出。??
我們可以在其中加上過濾 HTML 的功能 :??
#!/usr/local/bin/php -q??
??
$fp=fopen("/dev/stdin","r");??

while(!feof($fp)) {??
$c=fgetc($fp);??
$inputstr=$inputstr.$c;??
};??

fclose($fp);??

$inputstr=ereg_replace("]*)>","",$inputstr);??

echo $inputstr;??
?>??
假設(shè)將此程序命名為 filt2.php3﹐如此一來便完成了過濾功能﹐不信請拿個 HTML 檔來試試看 :??
more xxx.html | filt2.php3??
你便會看到刪除了 HTML TAG 的文件了。??
結(jié)論??
PHP 拿來當(dāng) Shell Script 事實上相當(dāng)?shù)睾糜茅o原因是 PHP 本身很好學(xué)﹐而且它又支持了各種數(shù)據(jù)庫﹐當(dāng)你已經(jīng)經(jīng)常拿 PHP 來設(shè)計你的網(wǎng)站之后﹐絕對不太喜歡再使用其它的 Shell Script 語言來處理其它必須非網(wǎng)頁的部份﹐這時候拿 PHP 來當(dāng)做 Shell Script 的好處就會顯現(xiàn)出來了﹐你可以以一貫的方式來發(fā)展整個系統(tǒng)﹐而不必一下要用 PHP一下又用 Perl/Python 或是 C。



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