探讨file_get_contents与curl效率及稳定性的分析

做过好多抓取别家网站内容的产品，习惯了使用方便快捷的file_get_contents函数，但是总是会遇到获取失败的问题，尽管按照手册中的例子设置了超时，可多数时候不会奏效：

复制代码 代码如下:

$config['context'] = stream_context_create(array(‘http' => array(‘method' => “GET”,
'timeout' => 5//这个超时时间不稳定，经常不奏效
)
));

复制代码 代码如下:

<span>function</span> curl_file_get_contents<span>(</span><span>$durl</span><span>)</span><span>{</span>
<span>$ch</span> <span>=</span> <span>curl_init</span><span>(</span><span>)</span><span>;</span>
<span>curl_setopt</span><span>(</span><span>$ch</span><span>,</span> CURLOPT_URL<span>,</span> <span>$durl</span><span>)</span><span>;</span>
<span>curl_setopt</span><span>(</span><span>$ch</span><span>,</span> CURLOPT_TIMEOUT<span>,</span> <span>5</span><span>)</span><span>;</span>
<span>curl_setopt</span><span>(</span><span>$ch</span><span>,</span> CURLOPT_USERAGENT<span>,</span> _USERAGENT_<span>)</span><span>;</span>
<span>curl_setopt</span><span>(</span><span>$ch</span><span>,</span> CURLOPT_REFERER<span>,</span>_REFERER_<span>)</span><span>;</span>
<span>curl_setopt</span><span>(</span><span>$ch</span><span>,</span> CURLOPT_RETURNTRANSFER<span>,</span> <span>1</span><span>)</span><span>;</span>
<span>$r</span> <span>=</span> <span>curl_exec</span><span>(</span><span>$ch</span><span>)</span><span>;</span>
<span>curl_close</span><span>(</span><span>$ch</span><span>)</span><span>;</span>
<span>return</span> <span>$r</span><span>;</span>
<span>}</span>