PHP Decode

<?php
/**
* Swoole(4.2.9)
* @author shixinke(http://www.shixinke.com)
* @modified 2018/11/28
*/

/**
*IO
*/
class swoole_async
{
    /**
     * 
     *
     * @example 
     * @param string $filename 
     * @param callable $callback ($fileName, $content)
     * @param int $chunk_size 
     * @param int $offset 
     * @return boolean
     */
    public static  function read(string $filename, Callable $callback, int $chunk_size = 8192, int $offset = 0): boolean
    {
    
    }

    /**
     * 
     *swoole_async_writefilewriteswoole_async_writeoffset
     * @example 
     * @param string $filename 
     * @param string $content 
     * @param int $offset 
     * @param callable $callback 
     * @return 
     */
    public static  function write(string $filename, string $content, int $offset, Callable $callback)
    {
    
    }

    /**
     * 
     *
     * @example 
     * @param string $filename 
     * @param callable $callback 
     * @return 
     */
    public static  function readFile(string $filename, Callable $callback)
    {
    
    }

    /**
     * 
     *
     * @example 
     * @param string $filename 
     * @param string $content 
     * @param callable $callback 
     * @param int $flags 4FILE_APPEND
     * @return 
     */
    public static  function writeFile(string $filename, string $content, Callable $callback, int $flags)
    {
    
    }

    /**
     * 
     *IP(DNScallback)
     * @example 
     * @param string $hostname 
     * @param callable $callback 
     * @return 
     */
    public static  function dnsLookup(string $hostname, Callable $callback)
    {
    
    }

    /**
     * 
     *DNS
     * @example 
     * @param string $domain_name 
     * @return 
     */
    public static  function dnsLookupCoro(string $domain_name)
    {
    
    }

    /**
     * 
     *IO
     *:
     * thread_num : IO
     *    aio_mode : IOSWOOLE_AIO_BASENode.jsSWOOLE_AIO_LINUXLinux Native AIO 2
     *    enable_signalfd : signalfd
     *    socket_buffer_size : SOCKET
     *    socket_dontwait :
     *    log_file :
     *    log_level : 
     * @example 
     * @param array $settings 
     * @return 
     */
    public static  function set(Array $settings)
    {
    
    }

    /**
     * 
     *Shellshell_execforkcommand
     * @example 
     * @param string $command ls
     * @param callable $callback $callback2$result$status
     * @return 
     */
    public static  function exec(string $command, Callable $callback)
    {
    
    }

}

 ?>