统计二维数组中某个值出现的次数

Question

$data =[ '0' =>[ 'id' => 7, 'patient_id' => 1, 'arr1' => 高, ], '1' =>[ 'id' => 11, 'patient_id' => 1, 'arr1' => 低, ], '2' => [ 'id' => 13, 'patient_id' => 1, 'arr1' => 低, ] ]; 我需要统计arr1的值为高的有多少个，低的有多少个。然后需要得出占总数的百分比，数组形式。$arr=[ '0'=>[ 'arr1'=>高， 'sl'=>1, 'bfb'=>33.33%, ], '1'=>[ 'arr1'=>低， 'sl'=>2, 'bfb'=>66.66%, ] ];好吧，因为问题提的不明确，修改很多次。十分抱歉！

Answer 1

    $arr = [
        0 => [
            'id' => 7,
            'patient_id' => 1,
            'arr1' => '高',
        ],
        1 => [
            'id' => 11,
            'patient_id' => 1,
            'arr1' => '低',
        ],
        2 => [
            'id' => 13,
            'patient_id' => 1,
            'arr1' => '低',
        ]
    ];
    
    $result = array();
    foreach ($arr as $value) {
       if(empty($value)) {
           continue;
       }
       if(!isset($result[$value['arr1']])) {
           $result[$value['arr1']] = 1;
           continue;
       }
       
       $result[$value['arr1']] ++;
    }
    
    var_dump("<pre>", $result);die;

Answer 2

要这么难吗？
$one['period']=isset(array_count_values(array_column($arr,'policy_status'))[0])?array_count_values(array_column($arr,'policy_status'))[0]:0;
下表0 是你要统计的数次数