PHP 8.4: Curl: New CURLOPT_TCP_KEEPCNT option
The PHP 8.4 Curl extension introduces a new Curl option named CURLOPT_TCP_KEEPCNT that sets the maximum number of TCP keep-alive probes.
The default value for this option is set to 9, but using the CURLOPT_TCP_KEEPCNT option, it is possible to increase or decrease the maximum number of keep-alive probes.
This option accepts any int value of 0 or higher. Attempting to set an invalid value results in the curl_setopt call to return false.
Other Curl options such as CURLOPT_TCP_KEEPALIVE, CURLOPT_TCP_KEEPIDLE, and CURLOPT_TCP_KEEPINTVL also provide more control over the TCP keep-alive feature.
$ch = curl_init('https://php.watch');
curl_setopt($ch, CURLOPT_TCP_KEEPCNT, 15));
curl_exec($ch);Backward Compatibility Impact
This option is available on PHP 8.4, and if the extension is built with libcurl 8.9.0 or later. It is not possible to back-port this feature to older PHP versions.