带循环的 PHP cURL

Question

我正在尝试集成一个 Web 服务，其中 JSON 响应返回接下来 1,000 个结果的 URL。我要做的就是循环 cURL 继续处理请求，直到“下一个”变量为空。

我在完成此操作时遇到问题，因为一旦看到返回的变量，我就无法循环备份。

$url = "https://xxxxxxxxxxxxxx.com/process/api/transactions/from/$yesterday/to/$today/for/company/21?offset=0&limit=1000"; 

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,$url);                                                              
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");                                                                                                                                    
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Cookie: $cookie"));
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);                                                                                                                                            

$result = curl_exec($ch);

file_put_contents(rj_array, $result, FILE_APPEND);

$server = file_get_contents(rj_array);

$json_result = json_decode($server, true);

$next = $json_result['next'];

我正在考虑做这样的事情：

while(!empty($next)){
//Do the curl request again with the new URL $next
}

但是我不能每次都重置 $next 变量。有人有什么想法吗？

Answer 1

为什么不

$base_url = "https://xxxxxxxxxxxxxx.com/process/api/transactions/from/$yesterday/to/$today/for/company/21?limit=1000";
$next = 0;
while( $next !== false ) {
    $url = $base_url . "&offset=" . $next;

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$url);                                                              
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");                                                                                                                                    
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FAILONERROR, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array("Cookie: $cookie"));
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);                                                                                                                                            

    $result = curl_exec($ch);

    file_put_contents(rj_array, $result, FILE_APPEND);

    $server = file_get_contents(rj_array);

    $json_result = json_decode($server, true);

    $next = $json_result['next'];
    if( /*test if next is empty*/ ) {
        $next = false;
    }
}

Answer 2

我确实喜欢递归函数方法：

function crawler($url, $return) {
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL,$url);
    curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FAILONERROR, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array("Cookie: $cookie"));
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);

    $result = curl_exec($ch);

    file_put_contents(rj_array, $result, FILE_APPEND);

    $server = file_get_contents(rj_array);

    $json_result = json_decode($server, true);
    $return[$url] = $json_result; //set your return information in some array

    $next = $json_result['next'];

    if(!empty($next)) {
        return crawler($next, $return); //call again same function with next url and array of data that you would use later
    }

    return $return;
}

$url = "https://xxxxxxxxxxxxxx.com/process/api/transactions/from/$yesterday/to/$today/for/company/21?offset=0&limit=1000";
$allJsonResults = crawler($url, []);

Answer 3

我不建议预测试循环或递归，这是后测试循环的任务。

在进入循环之前声明curl 调用的不变方面。在循环内部操纵偏移值和极限值并监视

next

值以确定是否需要另一次迭代。将

array_push()

与展开运算符一起使用，将新数据行追加到结果数组中。

代码：（模拟演示）

$url = "https://example.com/process/api/transactions/"
     . "from/$yesterday/to/$today/for/company/$company?offset=%d&limit=%d"; 

$ch = curl_init();
curl_setopt($ch, CURLOPT_CUSTOMREQUEST, "GET");                                                                                                                                    
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_FAILONERROR, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_HTTPHEADER, array("Cookie: $cookie"));
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, 0);                                                                                                                                            

$offset = 0;
$limit = 1000;
$result = [];
do {
    curl_setopt($ch, CURLOPT_URL, sprintf($url, $offset, $limit));
    $json = curl_exec($ch);
    // save the returned json string to your system if you wish
    $response = json_decode($json, true);
    array_push($result, ...$response['results']);
    $offset += $limit;
} while (!empty($response['next']));
var_export($result);