Online PHP editor | output for odtie

@ 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 7.4.0 - 7.4.33, 8.0.1 - 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: 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 ) ) )
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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