以特定格式输出php数组

Question

我试图以一种格式获得以下数组的输出。没有得到

<?php



    $distance_covered = array( '1_JAN_2017' => array('DRIVER_1' => array(2, 5, 3),'DRIVER_2' => array(3, 2, 6, 9)),
        '2_JAN_2017' => array('DRIVER_1' => array(3, 9), 'DRIVER_3' => array(1, 4, 8)),
        '3_JAN_2017' => array('DRIVER_4' => array(9), 'DRIVER_1' => array(2, 7, 5, 2)), 
        '4_JAN_2017' => array('DRIVER_1' => array(5, 3, 3, 2), 'DRIVER_4' => array(4, 9, 8, 5)), 
        '5_JAN_2017' => array('DRIVER_2' => array(8, 5), 'DRIVER_5' => array(3, 9, 7)),
        '6_JAN_2017' => array('DRIVER_5' => array(2, 1, 7, 5),  'DRIVER_4' => array(1, 9, 6)), 

        '7_JAN_2017' => array('DRIVER_4' => array(5, 2, 9), 'DRIVER_3' => array(4, 1, 6)), ); 

上面是我的数组，我想要输出的格式如下：Array ( [DRIVER_1] => 51, [DRIVER_2] => 33, [DRIVER_3] => 24, [DRIVER_4] => 67, [DRIVER_5] => 34 )，这是每个司机在所有行程中所走的距离之和。

我试过这样的代码，有人知道请帮忙

 $res = array();
    foreach($distance_covered as $value) {
        foreach($value as $key => $number) {
            (!isset($res[$key])) ?
                $res[$key] = $number :
                $res[$key] += $number;
        }
    }

    print_r($res);




    ?>

Answer 1

这个对我有用

$res = array();
foreach($distance_covered as $value)//the array which you have given us 
{
    foreach($value as $key => $number) //loop over array of date
    {
        if(!isset($res[$key]))//check if the key exist in over defined array if no then run this
        {
            $res[$key] = array_sum($number);// Sum all distances of that driver
            continue;//set the key and continue the foreach... 
        }
        $res[$key] += array_sum($number);// Sum all distances of that driver    
    }
}

print_r($res);      
die;

输出是

Array
(
    [DRIVER_1] => 51
    [DRIVER_2] => 33
    [DRIVER_3] => 24
    [DRIVER_4] => 67
    [DRIVER_5] => 34
)

Answer 2

这应该是可行的：

$res = array();
foreach($distance_covered as $value) {
    foreach($value as $key => $number) {
        foreach ($number as $n) {
            if (isset($res[$key])) {
                $res[$key] += $n;
            } else {
                $res[$key] = $n;
            }
        }
    }
}

print_r($res);

Answer 3

你们关系很好但是..。

    $res = array ();

    foreach ( $distance_covered as $value ) {
        foreach ( $value as $key=> $driver ) {
            if ( isset($res[$key]) == false ){
                $res[$key]=0;
            }
            $res[$key] += array_sum($driver);
        }
    }

    print_r($res);

第一个预言简单地将数据分解为几天。第二个返回元素，如$key = 'DRIVER_1‘和$driver =数组(3，9)。如果这是您第一次遇到这个驱动程序，那么您需要确保$res中的元素存在，所以将其设置为0。

一旦您知道其中有一个元素，就可以使用+= array_sum($driver)位添加值之和(在本例中为3&9)。+=只是简单地添加而不是a=a+b，您可以说是a+=b。