<?php
$fruits = array('apple' => '20', 'orange' => '40', 'pear' => '40');
$newFruits = array();
foreach ($fruits as $fruit=>$value)
{
$newFruits = array_merge($newFruits, array_fill(0, $value, $fruit));
}
$myFruit = $newFruits[array_rand($newFruits)];
echo $myFruit;
?>