- array_rand: documentation ( source)
<?php
$main_array=array('00','01','02');
$priority=array(0,0,0,0,0,0,0,0,1,2);
$rand_index=array_rand($priority);//select a random index from priority array.. $priority[$rand_index] will give you index 0 or 1 or 2 with your priority set..
echo $main_array[$priority[$rand_index]];