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<?php $array = [ ['group' => 1, 'animal' => 'ape'], ['group' => 1, 'animal' => 'bat'], ['group' => 1, 'animal' => 'cat'], ['group' => 2, 'animal' => 'dog'], ['group' => 1, 'animal' => 'eel'], ['group' => 3, 'animal' => 'fox'], ['group' => 1, 'animal' => 'gnu'], ['group' => 2, 'animal' => 'hog'], ]; $result = []; foreach ($array as $row) { $result[$row['group']] ??= $row + ['count' => 0]; ++$result[$row['group']]['count']; } var_export(array_values($result));
Output for 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, 8.4.16, 8.5.0 - 8.5.1
array ( 0 => array ( 'group' => 1, 'animal' => 'ape', 'count' => 5, ), 1 => array ( 'group' => 2, 'animal' => 'dog', 'count' => 2, ), 2 => array ( 'group' => 3, 'animal' => 'fox', '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.
Output for 5.4.45
Parse error: syntax error, unexpected '?' in /in/QJX8V on line 16
Process exited with code 255.
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