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@ 2022-06-28T22:49:30Z

<?php

$members = array(
    array(
        'num' => 2,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 2,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 3,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 3,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 3,
        'rank' => 0,
        'dense_rank' => 0,
    ),
        array(
        'num' => 3,
        'rank' => 0,
        'dense_rank' => 0,
    ),
        array(
        'num' => 3,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 5,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 9,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 9,
        'rank' => 0,
        'dense_rank' => 0,
    ),
    array(
        'num' => 9,
        'rank' => 0,
        'dense_rank' => 0,
    )   
);

$denseRank = 0;
$gappedRank = 0;
foreach ($members as &$row) {
    $denseRanks[$row['num']] ??= ++$denseRank;
    $row['dense_rank'] = $denseRanks[$row['num']];
    
    ++$gappedRank;
    $gappedRanks[$row['num']] ??= $gappedRank;
    $row['rank'] = $gappedRanks[$row['num']];
    
    // for better presentation:
    echo json_encode($row) . "\n";
}
//var_export($members);

Output for git.master, git.master_jit, rfc.property-hooks: {"num":2,"rank":1,"dense_rank":1} {"num":2,"rank":1,"dense_rank":1} {"num":3,"rank":3,"dense_rank":2} {"num":3,"rank":3,"dense_rank":2} {"num":3,"rank":3,"dense_rank":2} {"num":3,"rank":3,"dense_rank":2} {"num":3,"rank":3,"dense_rank":2} {"num":5,"rank":8,"dense_rank":3} {"num":9,"rank":9,"dense_rank":4} {"num":9,"rank":9,"dense_rank":4} {"num":9,"rank":9,"dense_rank":4}

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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2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn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2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0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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