nur2050

<?php
$array = [
[
  'player_id' => 1,
  'count_goals' => 1
],
[
  'player_id' => 1,
  'count_goals' => 1
],
[
  'player_id' => 1,
  'count_goals' => 1
],
[
  'player_id' => 1,
  'count_goals' => 1
],
];

function filter($array)
{
	$result = [];
  	foreach($array as $key => $value) {
		if (array_key_exists($value['player_id'], $result)) {
			$result[$value['player_id']]['count_goals'] += $value['count_goals'];
		} else {
			$result[$value['player_id']] = $value;	
		}
  	}
  return array_values($result);
}

print_r(filter($array));