PHP开发中如何优化并发执行和并行计算

Coun(function() {
    $url1 = 'Http://example.com/endpoint1';
    $url2 = 'http://example.com/endpoint2';
    
    $result1 = Coexec("curl -s $url1");
    $result2 = Coexec("curl -s $url2");
    
    echo "result1: $result1
";
    echo "result2: $result2
";
});

$urls = array('http://example.com/endpoint1', 'http://example.com/endpoint2', 'http://example.com/endpoint3');

$result = array();

foreach ($urls as $url) {
    $pid = pcntl_fork();
    if ($pid == -1) {
        die('Could not fork');
    } else if ($pid) {
        $pid = pcntl_wait($status);
        $result[$url] = $status;
    } else {
        $output = file_get_contents($url);
        echo "Got response from $url
";
        exit();
    }
}

print_r($result);

function get_data($id) {
    $cache_key = "data_$id";
    
    // 先从缓存中获取数据
    $data = apc_fetch($cache_key);
    
    if (!$data) {
        // 如果缓存中没有数据，则从数据库中获取
        $data = get_data_from_database($id);
        
        // 将数据存入缓存
        apc_store($cache_key, $data);
    }
    
    return $data;
}