(PECL pecl_http >= 0.10.0)
http_throttle — HTTP throttling
$sec
[, int $bytes = 40960
] )Sets the throttle delay and send buffer size.
Note: 此函数应与 http_send_data(), http_send_file() 和 http_send_stream() 一同使用。
Note: 提供基本的节流机制，会放弃当前进程或线程，直至实体已被发送完毕。
Note:
下列 SAPI 可能不能正常的工作： FastCGI.
sec
seconds to sleep after each chunk sent
bytes
the chunk size in bytes
Example #1 A http_throttle() example
Send file with approximately 20 kbyte/s.
<?php
// ~ 20 kbyte/s
# http_throttle(1, 20000);
# http_throttle(0.5, 10000);
http_throttle(0.1, 2000);
http_send_file('document.pdf');
?>
dr dot sane at gmail dot com (2011-03-19 13:24:32)
Note that in the example when it says "Send file with approximately 20 kbyte/s." that is only an upper bound. The file could still be sent at a lesser speed (e.g. 10 kb/s) if the client, network, or server, cannot handle the amount.