Do You Have Sample Code for Initializers?

exports.initializer = function(context, callback) {
    callback(null, '');
    };

def my_initializer(context):
    print("hello world!")

public void my_initializer(Context context)
{
RuntimeLogger log = context.getLogger();
log.log(String.format("ak:%s", context.getAccessKey()));
}

<?php
Function my_initializer($context) {
    echo 'hello world' . PHP_EOL;
    }
?>