[PHP] stream_set_blocking非阻塞模式影响fgets fread函数

<?php
$main_socket = stream_socket_server("tcp://0.0.0.0:8888", $error_code, $error_msg)  or die('create server failed');
while(1)
{
    set_error_handler(function(){}); 
    $new_socket = stream_socket_accept($main_socket, 5, $remote_address);
    restore_error_handler();
    if(!$new_socket) continue;
    //屏蔽或开启本行代码进行调试
    stream_set_blocking($new_socket, 0);
    $request = fread($new_socket, 8192);
    var_dump($request);
}