Introduction to several PHP callback functions

This article mainly shares with you an introduction to several PHP callback functions, mainly in code, hoping to help everyone.

Anonymous function

$server->on('Request', function ($req, $resp) {    echo "hello world";
});

Class static method

class A{    static function test($req, $resp)
   {        echo "hello world";
   }
}$server->on('Request', 'A::Test');$server->on('Request', array('A', 'Test'));

Function

function my_onRequest($req, $resp)
{    echo "hello world";
}$server->on('Request', 'my_onRequest');

Object method

class A{    function test($req, $resp)
   {        echo "hello world";
   }
}$object = new A();$server->on('Request', array($object, 'test'));

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