在多维数组php中查找所有重复值

Question

I have a array as following

array(
  0 => array('email' => '[e-mail]','name'=>'abc'),
  1 => array('email' => '[e-mail]','name'=>'xyz'),
  2 => array('email' => '[e-mail]','name'=>'uvw'),
  3 => array('email' => '[e-mail]','name'=>'str'),
 )

I want to filter out records on email address and get records having same email address. For example from above example I want

 array(
  0 => array(
     array(
         0 => array('email' => '[e-mail]','name'=>'abc'),
         1 => array('email' => '[e-mail]','name'=>'str'),
     )
 )

My code is

 $tmpArray = array();
    $duplicateRecords = array();
    if (empty($data)) {
        return false;
    }

    foreach ($data as $key => $value) {

        if (in_array($value['Email'], $tmpArray)) {
            $duplicateRecords[] = $value;
        }
        $tmpArray[] = $value['Email'];
    }

    echo '<pre>';print_r($duplicateRecords);die;

But this piece of code only returns the record's once existance, which is of second time. I know when It is traversing first time it isn't having email to compare. Is there any way to get existence of record as many times as it is in array.

Answer 1

// get count of each email
$counters = array_count_values(array_column($data, 'email'));

// collect email with counter > 1
$result = [];
foreach ($data as $item) {
    if ($counters[$item['email']] > 1) {
        $result[] = $item;
    }
}