簡(jiǎn)單粗暴视卢，直接上代碼，覺得有用廊驼，就桃心鼓勵(lì)下作者据过。
<?php
error_reporting(E_ALL &~ E_NOTICE);
set_time_limit(0);
date_default_timezone_set("Asia/Shanghai");
define("BR" , PHP_SAPI == "cli" ? "\n" : "<br>");
#define("READURL", "http://bbs.free9.net/forum.php?mod=post&action=newthread&fid=23&t=".time());
define("READURL", "http://localhost/test/1.php?t=".time());
#define("READURL", "http://www.163.com/");
trace_start("ALL");
define("MAX_RUN",1);
$i = 0 ;
while($i<1)
{
echo BR;
call_user_func("fun{$i}");
echo BR;
$i++;
}
/**************1**************/
function fun0(){
trace_start("curl_geturl");
for($i=0;$i<MAX_RUN;$i++){
$urls = geturl(READURL);
}
echo $urls;
trace_end("curl_geturl");
}
function fun1(){
trace_start("curl_filegetcontents");
for($i=0;$i<MAX_RUN;$i++){
$urls = file_get_contents(READURL);
}
trace_end("curl_filegetcontents");
}
function fun2(){
trace_start("curl_filegetcontents");
for($i=0;$i<MAX_RUN;$i++){
$urls = file_get_contents(READURL);
}
trace_end("curl_filegetcontents");
}
function fun3(){
trace_start("fpassthru");
for($i=0;$i<MAX_RUN;$i++){
$urls = fpassthru_read(READURL);
}
trace_end("fpassthru");
}
function fun4(){
trace_start("fopenurl");
for($i=0;$i<MAX_RUN;$i++){
$urls = fopenurl(READURL);
}
trace_end("fopenurl");
}
echo "$br$br";
trace_end("ALL");
**function geturl($url){**
$curl = curl_init($url);
$header[] = "HTTP/1.1 300 OK";
$header[] = "Cache-Control: max-age=0";
$header[] = "Connection: keep-alive";
$header[] = "Keep-Alive: 300";
$header[] = "Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7";
$header[] = "Accept-Language: en-us,en;q=0.5";
$header[] = "Pragma: "; // browsers keep this blank.
#curl_setopt($curl, CURLOPT_HTTPHEADER, $header);
curl_setopt($curl, CURLOPT_TIMEOUT , 10);
/**
CURLOPT_HEADER 設(shè)置成 true 啟用時(shí)會(huì)將頭文件的信息作為數(shù)據(jù)流輸出。 （會(huì)發(fā)送請(qǐng)求header ）
**/
#curl_setopt($curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Windows NT 6.1; rv:18.0) Gecko/20100101 Firefox/18.0");
curl_setopt($curl, CURLOPT_HEADER , true);
curl_setopt($curl, CURLOPT_RETURNTRANSFER , true);
$content = curl_exec($curl);
curl_close($curl);
return $content ;
}
function multi_geturl($urls, $ttl = 3){
$multi_ch= curl_multi_init();
$curl = array();
$contents = array();
foreach($urls as $k => $url){
/**init curl */
$curl[$k] = curl_init($url);
/**set options**/
curl_setopt_array(
$curl[$k],
array(
CURLOPT_URL => $url ,
CURLOPT_TIMEOUT => $ttl ,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_HEADER => false,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_MAXREDIRS => 1,
)
);
/**add handle **/
curl_multi_add_handle($multi_ch, $curl[$k]);
}
/**exec multi curl **/
//下面一大步的目的是為了減少cpu的無謂負(fù)擔(dān)妒挎，暫時(shí)不明蝶俱，來自php.net的建議，幾乎是固定用法
do {
$mrc = curl_multi_exec($multi_ch,$active);//當(dāng)無數(shù)據(jù)時(shí)或請(qǐng)求暫停時(shí)饥漫，active=true
} while ($mrc == CURLM_CALL_MULTI_PERFORM);//當(dāng)正在接受數(shù)據(jù)時(shí)
while ($active and $mrc == CURLM_OK) {//當(dāng)無數(shù)據(jù)時(shí)或請(qǐng)求暫停時(shí)，active=true,為了減少cpu的無謂負(fù)擔(dān),這一步很難明啊
if (curl_multi_select($multi_ch) != -1) {
do {
$mrc = curl_multi_exec($multi_ch, $active);
} while ($mrc == CURLM_CALL_MULTI_PERFORM);
}
}
//依次提取連接內(nèi)容
foreach ($urls as $k => $url)
{
$contents[$k]=curl_multi_getcontent($curl[$k]);
curl_multi_remove_handle($multi_ch,$curl[$k]);
curl_close($curl[$k]);
}
curl_multi_close($multi_ch);
return $contents;
}
function fpassthru_read($url){
$handle = fopen($url,"rb");
ob_start();
$res = fpassthru($handle);
ob_end_clean();
ob_flush();
fclose($handle);
return $res ;
}
function fopenurl($url){
$res = '';
$handle = fopen($url,"rb");
while (!feof($handle)) {
$res .= fread($handle, 8192);
}
fclose($handle);
return $res;
}
//程序運(yùn)行時(shí)間跟蹤
function trace_start($flag){
$GLOBALS[$flag]['_timeStart'] = microtime(TRUE);
//$GLOBALS[$flag]['_memStart'] = memory_get_usage();
//echo $flag.'_timeStart:'.$GLOBALS[$flag]['_timeStart']."-----_memStart:".$GLOBALS[$flag]['_memStart']. BR;
}
function trace_end($flag){
$GLOBALS[$flag]['_timeEnd'] = microtime(TRUE);
//$GLOBALS[$flag]['_memEnd'] = memory_get_usage();
//echo $flag.'_timeEnd:'.$GLOBALS[$flag]['_timeEnd']."-----_memEnd:".$GLOBALS[$flag]['_memEnd'].BR;
echo '['.$flag.'] Process Times: '.number_format($GLOBALS[$flag]['_timeEnd'] - $GLOBALS[$flag]['_timeStart'] ,6 ). " S ".BR ;
//echo '['.$flag.'] Memories: '.number_format( ($GLOBALS[$flag]['_memEnd'] - $GLOBALS[$flag]['_memStart']) /1024 ,6 ). " KBytes ".BR ;
}
echo 'ok';
exit;
一些總結(jié)
-
fopen /file_get_contents每次請(qǐng)求都會(huì)重新做DNS查詢罗标，并不對(duì)DNS信息進(jìn)行緩存庸队。
但是CURL會(huì)自動(dòng)對(duì)DNS信息進(jìn)行緩存。對(duì)同一域名下的網(wǎng)頁或者圖片的請(qǐng)求只需要一次DNS 查詢闯割。這大大減少了DNS查詢的次數(shù)彻消。所以CURL的性能比fopen /file_get_contents好很多。 -
fopen /file_get_contents在請(qǐng)求HTTP時(shí)宙拉，使用的是http_fopen_wrapper宾尚，不會(huì)keeplive。
而curl卻可以。這樣在多次請(qǐng)求多個(gè)鏈接時(shí)煌贴，curl效率會(huì)好一些御板。 -
fopen / file_get_contents函數(shù)會(huì)受到php.ini文件中allow_url_open選項(xiàng)配置的影響。如果該配置關(guān)閉了牛郑，則該函數(shù)也就失效了怠肋。而curl不受該配置的影響。 -
curl可以模擬多種請(qǐng)求淹朋，例如：POST數(shù)據(jù)笙各，表單提交等，用戶可以按照自己的需求來定制請(qǐng)求础芍。而fopen /file_get_contents只能使用get方式獲取數(shù)據(jù)杈抢。file_get_contents 獲取遠(yuǎn)程文件時(shí)會(huì)把結(jié)果都存在一個(gè)字符串中 fiels函數(shù)則會(huì)儲(chǔ)存成數(shù)組形式
