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  1. <?php
  2.  
  3. $arr=[
  4.   ['usr_id' => '89'],
  5.   ['usr_id' => '89'],
  6.   ['usr_id' => '12'],
  7. ];
  8. $activeBoosters = array_count_values(array_column($arr, 'usr_id'));
  9. var_dump($activeBoosters);
Success #stdin #stdout 0.04s 25740KB
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array(2) {
  [89]=>
  int(2)
  [12]=>
  int(1)
}
https://ideone.com/HM1TVn
language:
PHP (php 7.3.5)
created:
9 hours ago
visibility:
public

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