array_combine()期望参数1为数组，给定字符串

问题描述

我正在尝试将两个数组与PHP的 array_combine()函数结合起来，但出现此错误:

I'm trying to combine two arrays with PHP's array_combine() function and I receive this error:

$ subjects 的var_dump显示如下:

var_dump of $subjects shows this:

array(
  (int) 0 => 'English',
  (int) 1 => 'Mathematics',
  (int) 2 => 'Biology',
  (int) 3 => 'Physics',
  (int) 4 => 'Chemistry'
)

$ custom 的var_dump显示以下内容:

var_dump of $custom show this:

array(
  (int) 0 => array(
      'score' => '72',
      'grade' => 'B+',
      'points' => '10'
  ),
  (int) 1 => array(
      'score' => '99',
      'grade' => 'A',
      'points' => '12'
  ),
  (int) 2 => array(
      'score' => '77',
      'grade' => 'A-',
      'points' => '11'
  ),
  (int) 3 => array(
      'score' => '50',
      'grade' => 'C+',
      'points' => '7'
  ),
  (int) 4 => array(
      'score' => '66',
      'grade' => 'B+',
      'points' => '10'
  )
)

功能:

function score($received,$arr) {
    $keys = $received;
    $data_set = array_combine($keys,$arr);
    return $data_set;
}

在这里我调用函数:

$data_set = array_map(array($this->Scores,'score'),$subjects ,custom);

如果调试将所有变量都显示为数组:为什么$ subjects出现为array_combine的字符串?

if the debug shows all the variables as arrays: why is $subjects appearing as string to array_combine?

预期产量

array(
'English' => array(
    'score' => '72',
    'grade' => 'B+',
    'points' => '10'
),
'Mathematics' => array(
    'score' => '99',
    'grade' => 'A',
    'points' => '12'
),
'Biology' => array(
    'score' => '77',
    'grade' => 'A-',
    'points' => '11'
),
'Physica' => array(
    'score' => '50',
    'grade' => 'C+',
    'points' => '7'
),
'Chemistry' => array(
    'score' => '66',
    'grade' => 'B+',
    'points' => '10'
)
)

推荐答案

在使用预期的输出更新问题时，不需要 array_map().只需这样做:

As you updated your question with the expected output you don't need array_map(). Just do this:

$data_set = array_combine($subjects, $custom);

否则，您所做的就是遍历 $ subjects 和 $ custom 的所有元素.

Otherwise what you did is loop through all elements of $subjects and $custom.

所以您要做的是每次迭代:

So what you did is this each iteration:

return array_combine("English", ["score" => "72", "grade" => "B+", "points" => "10"]);
return array_combine("Mathematics", ["score" => "99", "grade" => "A", "points" => "12"]);
//...

这篇关于array_combine()期望参数1为数组，给定字符串的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！