Q:基于什么樣的理由 PHP 比其它 CGI 好呢?有沒(méi)有比較具體的數(shù)據(jù)可以證明 PHP 執(zhí)行與其它 CGI 執(zhí)行的效率好 ? 現(xiàn)在我的公司是用 C 來(lái)寫(xiě) CGI 的，如果換成 PHP，會(huì)不會(huì)比較好呢 ?沒(méi)有強(qiáng)而有力的依據(jù)的話(huà)，我就沒(méi)辦法說(shuō)服上面的人讓我轉(zhuǎn)成 PHP 了...

A:
我認(rèn)為"好" 要有三點(diǎn)
第一: 寫(xiě)出來(lái)的程式的執(zhí)行速度快.
第二: 遇到有大量存取時(shí)的執(zhí)行效能強(qiáng).
第三: 程式開(kāi)發(fā)的時(shí)間快，易維護(hù)。
php在這三點(diǎn)中，雖都不一定是最好的，但也都在前茅

以下是C,PHP和Perl在速度方面的比較
我用下面的算式測(cè)試
$s=1.0;
for ($i=1;$i<=10;$i++) {
for ($j=1;$j<=10;$j++) {
$s=$s*1.0005;
$s=$s/1.0004;
};
};
print $s;
?>
然后用ab -n 10000 -c 20 http://mycgi
測(cè)試，結(jié)果
C語(yǔ)言用了 37.511 秒
PHP3用了 45.393 秒
PERL用了 68.418 秒

看起是C 最快沒(méi)錯(cuò)，不過(guò)，和PHP3的結(jié)果沒(méi)有太大
的差距。
Perl最慢

以下為測(cè)試數(shù)據(jù)
==============================================
C 語(yǔ)言
==============================================

Document Path: /~evan/test/gcc.cgi
Document Length: 19 bytes

Concurrency Level: 20
Time taken for tests: 37.511 seconds
Complete requests: 10000
Failed requests: 0
Total transferred: 1750000 bytes
HTML transferred: 190000 bytes
Requests per second: 266.59
Transfer rate: 46.65 kb/s received

Connnection Times (ms)
min avg max
Connect: 0 30 3001
Processing: 4 40 69
Total: 4 70 3070

PHP3
==============================================
Document Path: /~evan/test/php3.php3
Document Length: 15 bytes

Concurrency Level: 20
Time taken for tests: 45.393 seconds
Complete requests: 10000
Failed requests: 0
Total transferred: 1710000 bytes
HTML transferred: 150000 bytes
Requests per second: 220.30
Transfer rate: 37.67 kb/s received

Connnection Times (ms)
min avg max
Connect: 0 34 3039
Processing: 6 53 183
Total: 6 87 3222


PERL
==============================================
Document Path: /~evan/test/perl.cgi
Document Length: 17 bytes

Concurrency Level: 20
Time taken for tests: 68.418 seconds
Complete requests: 10000
Failed requests: 0
Total transferred: 1730173 bytes
HTML transferred: 170017 bytes
Requests per second: 146.16
Transfer rate: 25.29 kb/s received

Connnection Times (ms)
min avg max
Connect: 0 22 3005
Processing: 9 112 323
Total: 9 134 3328