php curl , fsockopen 函数

下面直接给出 使用 curl 和 fsockopen 的例子，你可以当成使用实例，也可以直接当作封装好的函数直接使用。

curl函数使用代码

<code><span>public</span><span><span>function</span><span>xcurl</span><span>(<span>$url</span>,<span>$ref</span>=null,<span>$post</span>=array<span>()</span>,<span>$ua</span>=<span>"Mozilla/5.0 (X11; Linux x86_64; rv:2.2a1pre) Gecko/20110324 Firefox/4.2a1pre"</span>,<span>$print</span>=false)</span> {</span><span>$ch</span> = curl_init();
     curl_setopt(<span>$ch</span>, CURLOPT_AUTOREFERER, <span>true</span>);
     <span>if</span>(!<span>empty</span>(<span>$ref</span>)) {
          curl_setopt(<span>$ch</span>, CURLOPT_REFERER, <span>$ref</span>);
     }
     curl_setopt(<span>$ch</span>, CURLOPT_URL, <span>$url</span>);
     curl_setopt(<span>$ch</span>, CURLOPT_HEADER, <span>0</span>);
     curl_setopt(<span>$ch</span>, CURLOPT_FOLLOWLOCATION, <span>1</span>);
     curl_setopt(<span>$ch</span>, CURLOPT_RETURNTRANSFER, <span>1</span>);
     <span>if</span>(!<span>empty</span>(<span>$ua</span>)) {
          curl_setopt(<span>$ch</span>, CURLOPT_USERAGENT, <span>$ua</span>);
     }
     <span>if</span>(count(<span>$post</span>) > <span>0</span>){
          curl_setopt(<span>$ch</span>, CURLOPT_POST, <span>1</span>);
          curl_setopt(<span>$ch</span>, CURLOPT_POSTFIELDS, <span>$post</span>);
     }
     <span>$output</span> = curl_exec(<span>$ch</span>);
     curl_close(<span>$ch</span>);
     <span>if</span>(<span>$print</span>) {
          <span>print</span>(<span>$output</span>);
     } <span>else</span> {
          <span>return</span><span>$output</span>;
     }
}

</code>

fsockopen 函数使用代码：

<code><span>public</span><span><span>function</span><span>curl_request_async</span><span>(<span>$url</span>, <span>$params</span>, <span>$type</span>=<span>'GET'</span>)</span>
    {</span><span>// set referer</span><span>$referer</span> = <span>$_SERVER</span>[<span>'HTTP_HOST'</span>];
        <span>foreach</span> (<span>$params</span><span>as</span><span>$key</span> => &<span>$val</span>) {
            <span>if</span> (is_array(<span>$val</span>)) <span>$val</span> = implode(<span>','</span>, <span>$val</span>);
            <span>$post_params</span>[] = <span>$key</span>.<span>'='</span>.urlencode(<span>$val</span>);
        }
        <span>$post_string</span> = implode(<span>'&'</span>, <span>$post_params</span>);

        <span>$parts</span>=parse_url(<span>$url</span>);

        @<span>$fp</span> = fsockopen(<span>$parts</span>[<span>'host'</span>], <span>isset</span>(<span>$parts</span>[<span>'port'</span>])?<span>$parts</span>[<span>'port'</span>]:<span>80</span>, <span>$errno</span>, <span>$errstr</span>, <span>2</span>);

        <span>if</span>(!<span>$fp</span>){
            <span>echo</span><span>"$errstr ($errno)<br>\n"</span>;
        }<span>else</span>{
            <span>if</span>(<span>'GET'</span> == <span>$type</span>) <span>$parts</span>[<span>'path'</span>] .= <span>'?'</span>.<span>$post_string</span>;

            <span>$out</span> = <span>"$type "</span>.<span>$parts</span>[<span>'path'</span>].<span>" HTTP/1.1\r\n"</span>;
            <span>$out</span>.= <span>"Host: "</span>.<span>$parts</span>[<span>'host'</span>].<span>"\r\n"</span>;
            <span>$out</span>.= <span>"Referer: "</span>.<span>$referer</span>.<span>"\r\n"</span>;
            <span>$out</span>.= <span>"Content-Type: application/x-www-form-urlencoded\r\n"</span>;
            <span>$out</span>.= <span>"Connection: Close\r\n\r\n"</span>;
            <span>// Data goes in the request body for a POST request</span><span>if</span> (<span>'POST'</span> == <span>$type</span> && <span>isset</span>(<span>$post_string</span>)) <span>$out</span>.= <span>$post_string</span>;
            fwrite(<span>$fp</span>, <span>$out</span>);

            fclose(<span>$fp</span>);
        }
    }</code>

仅仅 从如上的函数，使用上的区别其中重要的一点就是：
curl 请求某个Url 需要等待结果返回，而 fsockopen 不需要返回，发送请求后就继续执行代码。除非你使用 fsockopen 需要打印请求后返回的结果。

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