怎么php使用socket获取远程图片

步骤：

1，匹配URL中的主机名和文件部分

2，创建socket并连接到目标服务器

3，构造HTTP请求并发送

4，读取HTTP响应并解析

5，保存内容到文件并关闭socket连接

代码实现如下：

<?php/* * 使用socket获取远程资源(网页，图片等) * url 资源URL * savepath 资源的保存路径 * return true/false */function get_remote_picture($url,$savepath="./"){    set_time_limit(0);    $pattern = '/(http:\/\/)?([^\/]+)(.+)/';    $res = preg_match($pattern, $url, $matches);    if($res == 0){        return false;    }    $host = "";//主机名    $file = "";//请求的文件    if(count($matches) == 3){        $host = $matches[1];        $file = $matches[2];    }else if(count($matches) == 4){        $host = $matches[2];        $file = $matches[3];    }else{        return false;    }    $socket = socket_create(AF_INET,SOCK_STREAM,SOL_TCP);    $res = socket_connect($socket,gethostbyname($host),80);    if(!$res){        //echo socket_strerror(socket_last_error($socket));        socket_close($socket);        return false;    }    $request = "";    $request .= "GET $file HTTP/1.1\r\n";    $request .= "Host: $host\r\n";    $request .= "Connection: close\r\n\r\n";    $len = socket_write($socket,$request);     $response = "";    while($buf=socket_read($socket,512)){        if(strlen($buf) == 0){            break;        }        $response .= $buf;    }    if(strpos($response,"\r\n\r\n")){        $arr = explode("\r\n\r\n",$response);        if(!file_exists($savepath)){            @mkdir($savepath);        }        $savepath = rtrim($savepath,'/').'/';        file_put_contents($savepath.basename($file),$arr[1]);    }else{        socket_close($socket);        return false;    }    socket_close($socket);    return true;} /* 获取百度logo */$url = "http://su.bdimg.com/static/superplus/img/logo_white.png";$result = get_remote_pict<strong>*本文来源gaodai#ma#com搞@代~码^网+</strong><strong>搞代gaodaima码</strong>ure($url);if($result){    echo 'get remote picture success';}else{    echo 'get remote picture failed';}

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