How to Resolve WeightLoadBalance into Php Application

WeightedHandleAdapter.php

<?php
class Factory {
    const W = 'W';
    const LOAD_BALANCE_W = 'BALANCE_W';
    const X = 'X';
    const LOAD_BALANCE_X = 'BALANCE_X';
    const Y = 'Y';
    const LOAD_BALANCE_Y = 'BALANCE_Y';
    const Z = 'Z';
    const LOAD_BALANCE_Z = 'BALANCE_Z';

    protected $_config = array (
        // enable disable flag
        self::W => 1,
        self::X => 1,
        self::Y => 1,
        self::Z => 1,
        // weighted percentage
        self::LOAD_BALANCE_W => 5,
        self::LOAD_BALANCE_X => 15,
        self::LOAD_BALANCE_Y => 25,
        self::LOAD_BALANCE_Z => 55,
    );

    public function handleAdapter()
    {
        $isWActive = (boolean)$this->_config[self::W];
        $isXActive = (boolean)$this->_config[self::X];
        $isYActive = (boolean)$this->_config[self::Y];
        $isZActive = (boolean)$this->_config[self::Z];
        $WPercentage = (int)$this->_config[self::LOAD_BALANCE_W];
        $XPercentage = (int)$this->_config[self::LOAD_BALANCE_X];
        $YPercentage = (int)$this->_config[self::LOAD_BALANCE_Y];
        $ZPercentage = (int)$this->_config[self::LOAD_BALANCE_Z];
        return self::W;
    }
}
$i=100;
while ($i--) {	
	echo (new Factory())->handleAdapter() .PHP_EOL;
}

?>