<?php
$http = new swoole_http_server("0.0.0.0", 9512);
$http->on("start", function ($server) {
    echo "Swoole http server is started at http://127.0.0.1:9512\n";
});
$http->on("request", function (\swoole_http_request $request, \swoole_http_response $response) {
    static $a= 0;
    $aPP;
    $response->write("a:".$a.PHP_EOL);
});
$http->start();
 browser request  http://127.0.0.1:9512
 first output 
 second output 
 third output 
 fourth output 
 Environment: 
 | PHP | 7.1.15 | 
 | Swoole | 4.0.0 | 
 | Laravel Framework | 5.5.26 
