PHP implements the merging of a two-dimensional array

1. This problem is mainly the merging of PH operation P two-dimensional array;

2. The initial array is as follows:

<code>$course = array(
    array(
        'course_name' => '高等数学',
        'major_name' => '计算机专业',
        'school_name' => '某A高校'
    ),
    array(
        'course_name' => '高等数学',
        'major_name' => '物理专业',
        'school_name' => '某A高校'
     ),
     array(
        'course_name' => '高等数学',
        'major_name' => '日语专业',
        'school_name' => '某A高校'
     ),
      array(
        'course_name' => '马克思概论',
        'major_name' => '计算机专业',
        'school_name' => '某B高校'
     )
)</code>

3. I hope to get the following array:

<code>$course = array(
    array(
        'course_name' => '高等数学',
        'major_name' => array('计算机专业','物理专业','日语专业'),
        'school_name' => '某A高校'
    ),
    array(
        'course_name' => '马克思概论',
        'major_name' => array('计算机专业'),
        'school_name' => '某B高校'
     )
)</code>

4. This is my first time asking a question; I hope I can get a reply. I'm not talented, I'm confused by this question, (I couldn't find a good answer, so I reached out once) (Urgent, urgent)

Reply content:

1. This problem is mainly the merging of PH operation P two-dimensional array;

2. The initial array is as follows:

<code>$course = array(
    array(
        'course_name' => '高等数学',
        'major_name' => '计算机专业',
        'school_name' => '某A高校'
    ),
    array(
        'course_name' => '高等数学',
        'major_name' => '物理专业',
        'school_name' => '某A高校'
     ),
     array(
        'course_name' => '高等数学',
        'major_name' => '日语专业',
        'school_name' => '某A高校'
     ),
      array(
        'course_name' => '马克思概论',
        'major_name' => '计算机专业',
        'school_name' => '某B高校'
     )
)</code>

3. I hope to get the following array:

<code>$course = array(
    array(
        'course_name' => '高等数学',
        'major_name' => array('计算机专业','物理专业','日语专业'),
        'school_name' => '某A高校'
    ),
    array(
        'course_name' => '马克思概论',
        'major_name' => array('计算机专业'),
        'school_name' => '某B高校'
     )
)</code>

4. This is my first time asking a question; I hope I can get a reply. I'm not talented, I'm confused by this question, (I couldn't find a good answer, so I reached out once) (Urgent, urgent)

First of all, the dimension of your data is as follows:
"College_Course": [Major 1, [Major 2, Major 3]]
So the only difference must be College_Course

<code>// 上接你的$course数据

$majors = array();
foreach($course as $item){
    extract($item);
    $key = "{$school_name}:{$course_name}";
    if(!isset($majors[$key]){
        $majors[$key] = array(
            "course_name" => $course_name,
            "school_name" => $school_name,
            "major_name" => array($major_name)
        );
    }else{ // 已存在key记录且major_name未重复, 追加 marjor_name
        if(!in_array($marjor_name, $majors[$key]['major_name']){
            $majors[$key]['major_name'][] = $marjor_name;
        }
    }
}
// 提取数组
$majors = array_values($majors);

print_r($majors); // 这就是你要的
</code>

<code>$result = array();
foreach ($course as $val) {
    if(!isset($result[$val['school_name'].$val['course_name']]['major_name'])) {
        $result[$val['school_name'].$val['course_name']]['major_name'] = array();
        $result[$val['school_name'].$val['course_name']]['course_name']=$val['course_name'];
        $result[$val['school_name'].$val['course_name']]['school_name']=$val['school_name'];
    }
    array_push($result[$val['school_name'].$val['course_name']]['major_name'],$val['major_name']);
}
var_dump(array_values($result)); 
// 输出结果如下
array(2) {
  [0]=>
  array(3) {
    ["major_name"]=>
    array(3) {
      [0]=>
      string(15) "计算机专业"
      [1]=>
      string(12) "物理专业"
      [2]=>
      string(12) "日语专业"
    }
    ["course_name"]=>
    string(12) "高等数学"
    ["school_name"]=>
    string(10) "某A高校"
  }
  [1]=>
  array(3) {
    ["major_name"]=>
    array(1) {
      [0]=>
      string(15) "计算机专业"
    }
    ["course_name"]=>
    string(15) "马克思概论"
    ["school_name"]=>
    string(10) "某B高校"
  }
}</code>