What functions does PHP support callbacks?

PHP supports callback functions: 1. Anonymous function, code is [$server->on 'Request']; 2. Class static method, code is [static function test $req]; 3. Function, code is [my_onRequest $req].

PHP supports callback functions:

1, anonymous function

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

You can use use to pass parameters to anonymous functions

2, Class static method

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

3, Function

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

4. Object method

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

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