Run the sub-connections of the current cURL handle

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- PHP Manual
- cURL Functions
- Run the sub-connections of the current cURL handle

# curl_multi_exec

(PHP 5, PHP 7, PHP 8)

curl_multi_exec — Run the sub-connections of the current cURL handle

### Description

curl_multi_exec(CurlMultiHandle `$multi_handle`, int `&$still_running`): int

Processes each of the handles in the stack. This method can be called whether or not a handle needs to read or write data.

### Parameters

`multi_handle`

  A cURL multi handle returned by curl_multi_init().

`still_running`

  A reference to a flag to tell whether the operations are still running.

### Return Values

A cURL code defined in the cURL Predefined Constants.

> Note:

> This only returns errors regarding the whole multi stack. There might still have occurred problems on individual transfers even when this function returns `CURLM_OK`.

### Changelog

Version | Description
--- | ---
8.0.0 | `multi_handle` expects a CurlMultiHandle instance now; previously, a resource was expected.

### Examples

Example #1 curl_multi_exec() example

This example will create curl handles for a list of URLs, add them to a multi handle, and process them asynchronously.

    <?php

    $urls = [
        "https://www.php.net/",
        "https://www.example.com/",
    ];

    $mh = curl_multi_init();
    $map = new WeakMap();

    foreach ($urls as $url) {
        $ch = curl_init($url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
        curl_multi_add_handle($mh, $ch);
        $map[$ch] = $url;
    }

    do {
        $status = curl_multi_exec($mh, $unfinishedHandles);
        if ($status !== CURLM_OK) {
            throw new \Exception(curl_multi_strerror(curl_multi_errno($mh)));
        }

        while (($info = curl_multi_info_read($mh)) !== false) {
            if ($info['msg'] === CURLMSG_DONE) {
                $handle = $info['handle'];
                curl_multi_remove_handle($mh, $handle);
                $url = $map[$handle];

                if ($info['result'] === CURLE_OK) {
                    $statusCode = curl_getinfo($handle, CURLINFO_HTTP_CODE);

                    echo "Request to {$url} finished with HTTP status {$statusCode}:", PHP_EOL;
                    echo curl_multi_getcontent($handle);
                    echo PHP_EOL, PHP_EOL;
                } else {
                    echo "Request to {$url} failed with error: ", PHP_EOL;
                    echo curl_strerror($info['result']);
                    echo PHP_EOL, PHP_EOL;
                }
            }
        }

        if ($unfinishedHandles) {
            if (($updatedHandles = curl_multi_select($mh)) === -1) {
                throw new \Exception(curl_multi_strerror(curl_multi_errno($mh)));
            }
        }
    } while ($unfinishedHandles);

    curl_multi_close($mh);

    ?>

### See Also

- curl_multi_init() - Returns a new cURL multi handle
- curl_multi_select() - Wait until reading or writing is possible for any cURL multi handle connection
- curl_exec() - Perform a cURL session