<?php

    $username =  "Thomas";

    $pass = "kika";
    $mail = "kkonsorr@yunio.de";
    $userID   =  1;
    $hashID   = substr( sysHash( $username.$userID.$mail ), 0, 6 );

    function sysHash($string)
    {
        if( $cryptedString = @hash( "sha256", $string ))
        {
            return $cryptedString;
        } else
        {
            $cryptedString = md5( $string );
            return $cryptedString;
        }
    }

    $pass = sysHash($pass);


    $partOne = substr( $pass, 0, 32);
    $partTwo = substr( $pass, 32, 32);

    $pass = $partOne.'['.$hashID.']'.$partTwo;

    echo $pass;