Explication détaillée d'exemples de cURL meilleur que file_get_contents() en PHP

<?php
    $url = &#39;http://www.baidu.com&#39;;
    // 初始化，获得一个cURL句柄
    $ch = curl_init();
    
    // 设置选项
    curl_setopt($ch, CURLOPT_URL, $url); // 请求URL
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); //返回数据流，而不直接输出
    curl_setopt($ch, CURLOPT_HEADER, 0); // 无需响应的header头
        curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30); //连接超时，秒为单位

    // 执行并获取返回内容
    $output = curl_exec($ch);
    if($output === false){
        $output = &#39;cURL error: &#39; . curl_error($ch);
    }
    // 释放 cURL 句柄资源
    curl_close($ch);

    print_r($output);
?>

curl_setopt($ch, CURLOPT_POST, 1); // 表明POST请求
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData)); // POST提交数据

<?php
    $input = file_get_contents(&#39;php://input&#39;);
    echo $input;
?>

<?php
    $url = &#39;http://remoteserver.com/index.php&#39;;
    $data = array(
        &#39;fname&#39;=> &#39;Daniel&#39;,
        &#39;lname&#39; => &#39;Stenberg&#39;
    );

     // 初始化
    $ch = curl_init();
    
    // 设置选项
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    curl_setopt($ch, CURLOPT_POST, 1); // POST请求
    curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($data)); //POST数据。用http_build_query()转换为“&”拼接的字符串

    // 执行并获取返回内容
    $output = curl_exec($ch);
    if($output === false){
        $output =  &#39;cURL error: &#39; . curl_error($ch);
    }

    // 释放 cURL 句柄资源
    curl_close($ch);

    print_r($output);
?>

fname=Daniel&lname=Stenberg

<?php
    $action = $_POST[&#39;action&#39;];
    if($action == &#39;uploadImage&#39;){
        $name = $_FILES[&#39;file&#39;][&#39;name&#39;];
        $tmpname = $_FILES[&#39;file&#39;][&#39;tmp_name&#39;];
        
        // 保存到当前脚本所在目录
        move_uploaded_file($tmpname, dirname(__FILE__).&#39;/&#39;.$name);

        $error = $_FILES[&#39;file&#39;][&#39;error&#39;];
        switch ($error) {
            case 0: echo &#39;上传成功&#39;; break;
            case 1: echo &#39;文件大小超出 php.ini 限制&#39;; break;
            case 2: echo &#39;文件大小超出 表单 MAX_FILE_SIZE 限制&#39;; break;
            case 3: echo &#39;文件部分被上传&#39;; break;
            case 4: echo &#39;没有文件被上传&#39;; break;
            case 6: echo &#39;找不到临时文件夹&#39;; break;
            case 7: echo &#39;文件写入失败&#39;; break;
            default: $output = &#39;未知错误&#39;;
        }
    }
?>

<?php
    $url = &#39;http://remoteserver.com/index.php&#39;;
    $file = realpath(getcwd() . &#39;/test.jpg&#39;);
    $data = array(
        &#39;action&#39; => &#39;uploadImage&#39;,
        &#39;file&#39; => &#39;@&#39; . $file
    );
    if(version_compare(PHP_VERSION, &#39;5.6.0&#39;) > 0){
        $data[&#39;file&#39;] = new CURLFile($file);
    }
    
    // 初始化
    $ch = curl_init();
    
    // 设置选项
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    curl_setopt($ch, CURLOPT_POST, 1);
    curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

    // 执行并获取返回内容
    $output = curl_exec($ch);
    if($output === false){
        $output =  &#39;cURL error: &#39; . curl_error($ch);
    }

    // 释放 cURL 句柄资源
    curl_close($ch);

    print_r($output);
?>

上传成功

<?php
    $url = &#39;http://remoteserver.com/test.jpg&#39;;
    $file = &#39;./test.jpg&#39;;
    $fp = fopen($file, &#39;w&#39;);

    // 初始化
    $ch = curl_init();

    // 设置选项
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);
    curl_setopt($ch, CURLOPT_FILE, $fp); // 用于传输的文件流，默认是STDOUT

    // 执行并获取返回内容
    $output = curl_exec($ch);
    if($output === false){
        $output =  &#39;cURL error: &#39; . curl_error($ch);
    }

    // 获取已下载大小
    $size_download = curl_getinfo($ch, CURLINFO_SIZE_DOWNLOAD);

    // 释放资源
    fclose($fp);
    curl_close($ch); 

    if ($size_download && $size_download == filesize($file)) {
        echo "下载成功";
    } else {
        echo "下载失败或不完整";
    }   
?>

下载成功

<?php
    $urls = array(
        &#39;http://www.baidu.com&#39;,
        &#39;http://www.qidian.com&#39;
    );
    $count = count($urls);
    $ch = array();

    // 创建批处理cURL句柄
    $mh = curl_multi_init();

    // 初始化每个cURL，并设置选项，绑定给批处理句柄
    for ($i = 0; $i < $count; $i++) {
        $ch[$i] = curl_init();
        curl_setopt($ch[$i], CURLOPT_URL, $urls[$i]);
        curl_setopt($ch[$i], CURLOPT_RETURNTRANSFER, 1);
        curl_setopt($ch[$i], CURLOPT_HEADER, 0);
        curl_setopt($ch[$i], CURLOPT_CONNECTTIMEOUT, 30);
        curl_multi_add_handle($mh, $ch[$i]);
    }

    // 执行批处理
    $running = null;
    do {
        usleep(10000); // 延迟0.01秒，单位为百万分之一秒
        curl_multi_exec($mh, $running); // 异步实现批处理，类似“多线程”
    } while($running > 0);

    // 获取每个cURL的响应
    $res = array();
    for ($i = 0; $i < $count; $i++) {
        $res[$i] = curl_multi_getcontent($ch[$i]);
    }

    // 关闭全部句柄
    for ($i = 0; $i < $count; $i++) {
        curl_multi_remove_handle($mh, $ch[$i]);
    }
    curl_multi_close($mh);

    print_r($res);
?>