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@ 2021-07-07T22:43:55Z

<?php

$data = array (
  '2021-07-07' => 
  array (
    0 => 
    array (
      'id' => 5435435,
      'homeID' => 8754,
      'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
      'competition_id' => 5808,
      'matches_completed_minimum' => 12,
    ),
    1 => 
    array (
      'id' => 1229873,
      'homeID' => 8754,
      'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
      'competition_id' => 5808,
      'matches_completed_minimum' => 12,
    ),
  ),
  '2021-07-09' => 
  array (
    0 => 
    array (
      'id' => 3243234,
      'homeID' => 8754,
      'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
      'competition_id' => 5808,
      'matches_completed_minimum' => 12,
    ),
    1 => 
    array (
      'id' => 1229873,
      'homeID' => 8754,
      'match_url' => '/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873',
      'competition_id' => 5808,
      'matches_completed_minimum' => 12,
    ),
  ),
);

$seen = [];

foreach(array_keys($data) as $i) {
    foreach(array_keys($data[$i]) as $j) {
        $id = $data[$i][$j]['id'];
        if( in_array($id, $seen) ) {
            unset($data[$i][$j]);
        } else {
            $seen[] = $id;
        }
    }
}

var_dump($data, $seen);

Output for git.master, git.master_jit, rfc.property-hooks: array(2) { ["2021-07-07"]=> array(2) { [0]=> array(5) { ["id"]=> int(5435435) ["homeID"]=> int(8754) ["match_url"]=> string(68) "/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873" ["competition_id"]=> int(5808) ["matches_completed_minimum"]=> int(12) } [1]=> array(5) { ["id"]=> int(1229873) ["homeID"]=> int(8754) ["match_url"]=> string(68) "/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873" ["competition_id"]=> int(5808) ["matches_completed_minimum"]=> int(12) } } ["2021-07-09"]=> array(1) { [0]=> array(5) { ["id"]=> int(3243234) ["homeID"]=> int(8754) ["match_url"]=> string(68) "/usa/reading-united-ac-vs-ocean-city-noreasters-fc-h2h-stats#1229873" ["competition_id"]=> int(5808) ["matches_completed_minimum"]=> int(12) } } } array(3) { [0]=> int(5435435) [1]=> int(1229873) [2]=> int(3243234) }

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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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