從另一個數組中查找數組中的值

Question

第一個數組是

Array
(
    [2] => Course 1
    [3] => C2
    [4] => COMPUTATIONAL MATHEMATICS -I
    [5] => BASIC ELECTRONICS
    [6] => DATA STRUCTURE
    [7] => COMMUNICATION SKILL
    [8] => SYSTEMS PROGRAMMING 
    [9] => DIGITAL LOGIC 
    [10] => GROUP A:ENGINEERING DRAWING & WORKSHOP
)

我的第二個數組是

 Array
    (
        [0] => Array
            (
                [course_id] => 2
            )
        [1] => Array
            (
                [course_id] => 4
            )
        [2] => Array
            (
                [course_id] => 6
            )
        [3] => Array
            (
                [course_id] => 10
            )
    )

我的預期結果是

Array
    (
        [2] => Course 1
        [4] => COMPUTATIONAL MATHEMATICS -I
        [6] => DATA STRUCTURE
        [10] => GROUP A:ENGINEERING DRAWING & WORKSHOP
    )

我想找出第一個數組是否包含第二個數組中的值並返回結果數組。 有什么想法嗎？

Answer 1

嘗試這個

$firstArray = Array();
    $firstArray[2] = "Course 1";
    $firstArray[3] = "C2";
    $firstArray[4] = "COMPUTATIONAL MATHEMATICS -I";
    $firstArray[5] = "BASIC ELECTRONICS";
    $firstArray[6] = "DATA STRUCTURE";
    $firstArray[7] = "COMMUNICATION SKILL";
    $firstArray[8] = "SYSTEMS PROGRAMMING"; 
    $firstArray[9] = "DIGITAL LOGIC";
    $firstArray[10] = "GROUP A:ENGINEERING DRAWING & WORKSHOP";

$secondArray = Array();
$secondArray[0]["course_id"] = 2;
$secondArray[1]["course_id"] = 4;
$secondArray[2]["course_id"] = 6;
$secondArray[3]["course_id"] = 10;

$result = array(); 
foreach($secondArray as $second){
    $result[$second["course_id"]] = $firstArray[$second["course_id"]];
}
echo '<pre>';
print_r($result);

Answer 2

你可以做這樣的事情。 將result定義為數組。 並使用for循環將第二個數組的值放入其中。

$result = array();
foreach($second_array as $sa){
   $result[$sa] = $first_array[$sa];
}

print_r($result);

Answer 3

@Ronak的答案是正確的想法...結果鍵只需要引用course_id，否則會發生未定義的偏移量錯誤。

抱歉，我會發表評論，但代表還不夠:)

$result = array();
foreach($second_array as $sa){
   $result[$sa['course_id']] = $first_array[$sa['course_id']];
}

print_r($result);

Answer 4

您需要轉換為第二維數組，並在使用array_diff_key（）之后