Question

这是我的随机数组，并不总是从2012年开始到2017年结束。

Array
(
    [2012] => 1
    [2014] => 1
    [2015] => 1
    [2016] => 4
    [2017] => 1
)

我有一个这样的数组，我希望它像这样

Array
(
    [2012] => 1 //The start, not add
    [2014] => 2 //2012 + 2014 = 1 + 1 = 2
    [2015] => 3 //2012 + 2014 + 2015 = 1 + 1 + 1 = 3
    [2016] => 7 //2012 + 2014 + 2015 + 2016 = 1 + 1 + 1 + 4 = 7 
    [2017] => 8 //2012 + 2014 + 2015 + 2016 + 2017 = 1 + 1 + 1 + 4 + 1 = 8
)

Answer 1

$arr = array(
    2012 => 1, // 1
    2014 => 1, // 2
    2015 => 1, // 3
    2016 => 4, // 7
    2017 => 1  // 8
);

// Getting the all keys of array
$keys = array_keys($arr);

// Make a new array to set the executed values 
$arr1 = array();

// loop the array
for ($i = 0; $i < count($arr); $i++) {
    $sum = 0;
    for ($j = 0; $j <= $i; $j++) {
        $sum += $arr[$keys[$j]];
    }
    // set values to new array
    $arr1[$keys[$i]] = $sum;
}

// print the new array
print_r($arr1);

PHP数组增量

1 个答案: