掌握实战：PHP 异步 HTTP 下载多个文件的开发实例及解决方案

<?php

$urls = array(
    'https://example.com/file1.jpg',
    'https://example.com/file2.jpg',
    'https://example.com/file3.jpg',
    // 更多文件的 URL
);

$curlHandles = array();
$result = array();

// 初始化 cURL
$multiHandle = curl_multi_init();

foreach ($urls as $index => $url) {
    $curlHandle = curl_init($url);
    
    // 设置 cURL 选项
    curl_setopt($curlHandle, CURLOPT_RETURNTRANSFER, true);
    
    // 添加到多个句柄中
    curl_multi_add_handle($multiHandle, $curlHandle);
    
    $curlHandles[$index] = $curlHandle;
}

// 执行并发请求
do {
    $status = curl_multi_exec($multiHandle, $runningHandles);
} while ($status === CURLM_CALL_MULTI_PERFORM || $runningHandles);

// 处理结果
foreach ($curlHandles as $index => $curlHandle) {
    // 检查请求是否成功
    $error = curl_error($curlHandle);
    if ($error) {
        $result[$index] = array(
            'success' => false,
            'error' => $error,
        );
    } else {
        // 获取响应内容
        $response = curl_multi_getcontent($curlHandle);
        
        // 保存文件，此处省略
        // file_put_contents('path/to/save/file', $response);
        
        $result[$index] = array(
            'success' => true,
            'file' => 'path/to/save/file',
        );
    }
    
    // 移除句柄
    curl_multi_remove_handle($multiHandle, $curlHandle);
}

// 关闭多个句柄
curl_multi_close($multiHandle);

// 输出结果
var_dump($result);

?>