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run code in 500+ PHP versions simultaneously

@ 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 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.7: {"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}
Output for 7.0.16: Parse error: syntax error, unexpected '=' in /in/QadLk on line 64
Process exited with code 255.
Output for 5.6.20 - 5.6.40: Parse error: syntax error, unexpected '?' in /in/QadLk on line 64
Process exited with code 255.

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91.2 ms | 1335 KiB | 4 Q