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@ 2022-03-04T08:05:29Z

<?php

$data = [['id' => 972, 'grouped_by' => 1], ['id' => 664, 'grouped_by' => 4], ['id' => 631, 'grouped_by' => 4], ['id' => 630, 'grouped_by' => 1], ['id' => 971, 'grouped_by' => 1], ['id' => 973, 'grouped_by' => 1], ['id' => 974, 'grouped_by' => 1]];

$grouped_result = $grouped_by_counts = [];
$previous_grouped_by = null; // a value that will never occur in the data

foreach($data as $datum) {
    if($datum['grouped_by'] !== $previous_grouped_by) {
        $grouped_by_counts[$datum['grouped_by']] =
          isset($grouped_by_counts[$datum['grouped_by']]) ? 
          $grouped_by_counts[$datum['grouped_by']] + 1 : 1;
    }
    $grouped_result[
      $datum['grouped_by'].'.'.$grouped_by_counts[$datum['grouped_by']]
    ][] = $datum;
    $previous_grouped_by = $datum['grouped_by'];
}

print_r($grouped_result);

Output for git.master, git.master_jit, rfc.property-hooks: Array ( [1.1] => Array ( [0] => Array ( [id] => 972 [grouped_by] => 1 ) ) [4.1] => Array ( [0] => Array ( [id] => 664 [grouped_by] => 4 ) [1] => Array ( [id] => 631 [grouped_by] => 4 ) ) [1.2] => Array ( [0] => Array ( [id] => 630 [grouped_by] => 1 ) [1] => Array ( [id] => 971 [grouped_by] => 1 ) [2] => Array ( [id] => 973 [grouped_by] => 1 ) [3] => Array ( [id] => 974 [grouped_by] => 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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions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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