<?php $array = [ ['user' => 'Name 1', 'group' => 1], ['user' => 'Name 2', 'group' => 1], ['user' => 'Name 3', 'group' => 2], ['user' => 'Name 4', 'group' => 2], ['user' => 'Name 5', 'group' => 3], ]; var_export( array_count_values(array_column($array, 'group')) );
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