我有一个函数,可以多次使用 cURL 调用3个不同的API。每个API的结果都会传递给嵌套循环中调用的下一个API,因此cURL当前打开并关闭超过500次。
我应该为整个功能打开cURL,还是可以在一个功能中多次打开和关闭它?
答案 0 :(得分:25)
重复使用相同的句柄会有性能提升。请参阅:Reusing the same curl handle. Big performance increase?
如果您不需要同步请求,请考虑使用curl_multi_ *函数(例如curl_multi_init,curl_multi_exec等),这也会带来很大的性能提升。
更新:
我尝试使用每个请求的新句柄并使用相同的句柄和以下代码进行卷曲:
ob_start(); //Trying to avoid setting as many curl options as possible
$start_time = microtime(true);
for ($i = 0; $i < 100; ++$i) {
$rand = rand();
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "http://www.google.com/?rand=" . $rand);
curl_exec($ch);
curl_close($ch);
}
$end_time = microtime(true);
ob_end_clean();
echo 'Curl without handle reuse: ' . ($end_time - $start_time) . '<br>';
ob_start(); //Trying to avoid setting as many curl options as possible
$start_time = microtime(true);
$ch = curl_init();
for ($i = 0; $i < 100; ++$i) {
$rand = rand();
curl_setopt($ch, CURLOPT_URL, "http://www.google.com/?rand=" . $rand);
curl_exec($ch);
}
curl_close($ch);
$end_time = microtime(true);
ob_end_clean();
echo 'Curl with handle reuse: ' . ($end_time - $start_time) . '<br>';
并得到以下结果:
Curl without handle reuse: 8.5690529346466
Curl with handle reuse: 5.3703031539917
因此,重复使用相同的句柄实际上会在多次连接到同一服务器时提供显着的性能提升。我尝试连接到不同的服务器:
$url_arr = array(
'http://www.google.com/',
'http://www.bing.com/',
'http://www.yahoo.com/',
'http://www.slashdot.org/',
'http://www.stackoverflow.com/',
'http://github.com/',
'http://www.harvard.edu/',
'http://www.gamefaqs.com/',
'http://www.mangaupdates.com/',
'http://www.cnn.com/'
);
ob_start(); //Trying to avoid setting as many curl options as possible
$start_time = microtime(true);
foreach ($url_arr as $url) {
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_exec($ch);
curl_close($ch);
}
$end_time = microtime(true);
ob_end_clean();
echo 'Curl without handle reuse: ' . ($end_time - $start_time) . '<br>';
ob_start(); //Trying to avoid setting as many curl options as possible
$start_time = microtime(true);
$ch = curl_init();
foreach ($url_arr as $url) {
curl_setopt($ch, CURLOPT_URL, $url);
curl_exec($ch);
}
curl_close($ch);
$end_time = microtime(true);
ob_end_clean();
echo 'Curl with handle reuse: ' . ($end_time - $start_time) . '<br>';
得到以下结果:
Curl without handle reuse: 3.7672290802002
Curl with handle reuse: 3.0146431922913
性能仍有相当大的提升。