<?php
    public function randPhone()
    {
        $areaCode   = array();
        $exchange   = array();
        $subscriber = array();

        for ($i = 0; $i < 3; $i++) {
            $areaCode []= rand(1, 9);
            $exchange []= rand(1, 9);
        }

        for ($i = 0; $i < 4; $i++) {
            $subscriber []= rand(0, 9);
        }

        return implode('', $areaCode) .
               implode('', $exchange) .
               implode('', $subscriber);
    }
?>