Question

就像演示一样，请尝试以下代码：

<?php
echo '<pre>';      
ob_end_flush();
for($i=0;$i<2;$i++) {
passthru("ping -n 8 127.0.0.1");
@ob_flush();
}
echo '</pre>';
?>

这是输出：

Pinging stackoverflow.com [64.34.119.12] with 32 bytes of data:
Reply from 64.34.119.12: bytes=32 time=28ms TTL=56
Reply from 64.34.119.12: bytes=32 time=29ms TTL=56
Reply from 64.34.119.12: bytes=32 time=29ms TTL=56
Reply from 64.34.119.12: bytes=32 time=28ms TTL=56

Ping statistics for 64.34.119.12:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 28ms, Maximum = 29ms, Average = 28ms

Pinging stackoverflow.com [64.34.119.12] with 32 bytes of data:
Reply from 64.34.119.12: bytes=32 time=28ms TTL=56
Reply from 64.34.119.12: bytes=32 time=27ms TTL=56
Reply from 64.34.119.12: bytes=32 time=26ms TTL=56
Reply from 64.34.119.12: bytes=32 time=29ms TTL=56

Ping statistics for 64.34.119.12:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 26ms, Maximum = 29ms, Average = 27ms

它实际上做了两次（来自“小于2”的循环）。如果您测试脚本，您会注意到第一个脚本需要几秒钟，然后它会立即输出。在那之后（第二次循环），它逐行进行。我的目标是只有一个输出，一行一行而不缓冲任何输出，如下所示，除非发生这种情况：

<?php
system("ping -n 8 127.0.0.1");
?>

注意：这是在使用PHP 5的Windows服务器上运行。

Answer 1

所以，这里发生的事情是你的浏览器可能正在缓冲。我想如果你看一下数据包嗅探器，你的冲洗可能正常。

为确保这一点，请致电flush()以及ob_flush()。

你永远无法清除所有缓冲区，因为PHP只知道它自己的缓冲区。服务器可以缓冲，客户端几乎总是缓冲。

PHP输出缓冲区失败

1 个答案: