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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 git.master, git.master_jit, rfc.property-hooks: 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 ) )

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2022-12-01 RFC: Property hooks - included in PHP 8.4
2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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