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4.x is outdated, please check the latest version 22.x
pecl install openswoole-22.0.0
<?php Swoole\Client->sendfile(string $filename, $offset = 0, $length = -1)
The location of the file to send.
Offset and start point to send the file.
The length of the data to send.
Send file to the remote socket.
This is a wrapper of the Linux sendfile system call.