php求正负数数组中连续元素最大值示例

<?php
$list = array(1,-3,-5,-7,8,9,-11,5);

$cur = 0;
$term = 0;
$res = 0;
$begin = 0;

foreach($list as $k => $v){
 $cur += $v;
 if($cur < 0){
  $cur = 0;
  $begin = $k + 1;
 }
 if($cur > $res){
  $res = $cur;
  $term = $k;
 }
}
$max_seq = array_slice($list, $begin, ($term - $begin) + 1);

echo $res . ',';
print_r($max_seq);
//17,Array ( [0] => 8 [1] => 9 )