如何在php中比较2个数组的值并输出差异[重复]答案

【问题标题】：how to compare the values of 2 arrays with each other in php and output the differences [duplicate]如何在php中比较2个数组的值并输出差异[重复]
【发布时间】：2020-01-20 20:34:46
【问题描述】：

我有 2 个数组，每个数组有 10 个值。

print_r of var $correct answers 给了我这个输出：

Array ( 
[0] => 3 
[1] => 0 
[2] => 2 
[3] => 3 
[4] => 2 
[5] => 2 
[6] => 3 
[7] => 1 
[8] => 3 
[9] => 1 
)

print_r of var $choosen_answers 给了我这个输出：

Array ( 
[0] => 2 // different value
[1] => 0 
[2] => 1 // different value
[3] => 3 
[4] => 2 
[5] => 2 
[6] => 3 
[7] => 1 
[8] => 3 
[9] => 0 // different value
)

数组中的每个值都对应问题的个数，所以

[0] has the value of question 1
[1] has the value of question 2
[2] has the value of question 3
and so on...

我想要实现：将这些数组相互比较，然后给我一个输出，例如：

Number of wrong answers: 3

Wrong answers: Question 1 Question 3 Question 10

我怎样才能做到这一点？

【问题讨论】：

到目前为止你尝试过什么？你被困在哪里了？

标签： php arrays array-difference

【解决方案1】：

尊重上面的答案，但可以更轻松地完成： https://www.php.net/manual/en/function.array-diff-assoc.php

$compare_values = array_diff_assoc($correct_answers, $chosen_answers) ; // compare each value of the 2 arrays with each other                       
echo 'Wrong answers: '.count($compare_values).'<br />';
echo 'Wrong questions:<br />';
foreach($compare_values as $key => $value) {
    echo 'Question: '.($key + 1).'<br />'; // + 1 because question 0 does not exist
}

【讨论】：

【解决方案2】：

function get_wrong_answers($correct_answers, $chosen_answers) {
   // For all given answers, 
   foreach( $chosen_answers as $answer_number=>$given_single_answer ) {
       // check if the answer is correct
       if( $correct_answers[$answer_number] === $given_single_answer )
          // If its correct, remove it from the chosen answers
          unset( $chosen_answers[$key] );
   }
   return $chosen_answers;
}

$wrong_answers = get_wrong_answers($a,$b);

echo 'Number of wrong answers: ' . count( $wrong_answers );

echo 'Wrong answers:';

foreach( $wrong_answers as $answer_number=>$answer ) {
    echo 'Question ' . $answer_number;
}

【讨论】：