7. 盛最多水的容器

<?php
class Solution {
    /**
     * @param $height
     * @return int|mixed
     */
    public function maxArea($height) {
        $left = 0;
        $right = count($height) - 1;
        $maxArea = 0;
        while ($left < $right) {
            $maxArea = max($maxArea, ($right - $left) * min($height[$left], $height[$right]));
            if ($height[$left] < $height[$right]) {
                $left++;
            } else {
                $right--;
            }
        }
        return $maxArea;
    }
}
$height = [1, 8, 6, 2, 5, 4, 8, 3, 7];
$cls = new Solution();
$ret = $cls->maxArea($height);
print_r($ret);