Why does swoole need to be started using the command line?

swoole: PHP's coroutine high-performance network communication engine uses fully synchronous code to implement asynchronous programs. There is no need to add any additional keywords to the PHP code. The bottom layer automatically performs coroutine scheduling to implement asynchronous IO.

The server based on swoole should be run in command line mode to ensure that there is only one instance (the port cannot be opened repeatedly)

We use Swoole to make one (Recommended learning: swoole video tutorial)

<?php
$http = new swoole_http_server(&#39;0.0.0.0&#39;, 80, SWOOLE_BASE);
$http->on(&#39;request&#39;, function(swoole_http_request $req, swoole_http_response $res) use($http) {
    $res->write("hello world");
    $res->end();
});

OK, you see, it does not rely on mechanisms such as framework/ob_flush, Swoole can no longer use echo as the output method, you have to use $res ->write(String $content) and $res->end(String $endContent).

So how do we access it?

Command line startup

php app.php
# 你在代码里面 echo/var_dump/print(_r) 的内容将在这里输出

Then open http://localhost/ in the browser and you can get the output of hello world.

But have you found it? http://localhost/ and http://localhost/ xxx all output the same content.

If we only want php to output under http://localhost/, how to write it?

<?php
$http = new swoole_http_server(&#39;0.0.0.0&#39;, 80, SWOOLE_BASE);
$http->on(&#39;request&#39;, function(swoole_http_request $req, swoole_http_response $res) use($http) {
    if($req->server[&#39;request_uri&#39;] == &#39;/&#39;){
        $res->write("hello world");
        $res->end();
        return;
    }
    $res->end(&#39;404&#39;);
    return;
});

\Swoole_http_request $req contains a lot of information that we can use in the future The request data used. Including $req->server, $req->get, $req->post, array structure, ->server’s KEY is lowercase

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