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@ 2021-02-12T12:22:31Z

<?php

$original_array = [                                                                                                                           
    0 => [
          'lat' => 40.7587979,
          'lon' => -73.9623427
      ],  
    1 => [
          'lat' => 39.8587028,
          'lon' => -84.277025
      ],  
    2 => [
          'lat' => 37.7647993,
          'lon' => -122.4629897
      ],  
    3 => [
          'lat' => 37.7647993,
          'lon' => -122.4629897
      ],  
    4 => [
          'lat' => 33.5125302,
          'lon' => -117.6860507
      ],  
    5 => [
            'lat' => 39.8587028,
            'lon' => -84.277025
        ],
];

// To hold the new array
$out = []; 

// Outer loop over the result from array_count_values()
foreach (array_count_values(array_map(function($l) {
    // Map function combines lat|lng
    return implode("|", $l);
  // The rest of the loop syntax...
  }, $original_array)) as $pair => $count) {

  // Split the counted array key back to individual lat,lng
  list($lat, $lng) = explode("|", $pair);

  // Put it all onto the output array
  $out[] = [ 
    'lat' => $lat,
    'lng' => $lng,
    'count' => $count
  ];  
}

print_r($out);

Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: Array ( [0] => Array ( [lat] => 40.7587979 [lng] => -73.9623427 [count] => 1 ) [1] => Array ( [lat] => 39.8587028 [lng] => -84.277025 [count] => 2 ) [2] => Array ( [lat] => 37.7647993 [lng] => -122.4629897 [count] => 2 ) [3] => Array ( [lat] => 33.5125302 [lng] => -117.6860507 [count] => 1 ) )
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.

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