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@ 2021-08-05T11:39:02Z

<?php

// groupA:
//   James:
//     gpa: 3
//     age: 13
//   Charles:
//     gpa: 4
//     age: 15
//   John:
//     gpa: 2
//     age: 17

$groupA = [
    'James' => [
        'gpa' => 3,
        'age' => 13
    ],
    'Charles' => [
        'gpa' => 4,
        'age' => 15
    ],
    'John' => [
        'gpa' => 2,
        'age' => 17
    ]
];

/**
 * @throws \InvalidArgumentException
 * @throws \RuntimeException
 */
function getPlace(string $for, string $compareValueKey, array $haystack, int $flags = SORT_REGULAR): int
{
    if(empty($haystack) || !isset($haystack[$for]))
    {
        throw new \InvalidArgumentException("empty haystack array given (or key '$for') was not found");
    }
    
    $sort = array_map(fn(array $el) => $el[$compareValueKey], $haystack);
    arsort($sort, $flags);
    
    $place = array_search($for, $places = array_keys($sort), true);
    
    if(!is_int($place))
    {
        throw new \RuntimeException("could not locate position for key '$for' in given array: " . trim(implode(', ', $places)));
    }
    
    return $place + 1;
}

$persons = array_keys($groupA);

foreach($persons as $person)
{
    echo $person . ': ' . getPlace($person, 'age', $groupA) . PHP_EOL;
}

Output for 7.4.0 - 7.4.1, 8.0.9, 8.1.23 - 8.1.28, 8.2.10 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6: James: 3 Charles: 2 John: 1
Output for 8.3.5: Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 James: 3 Charles: 2 John: 1
Output for 7.0.0, 7.1.0, 7.2.0, 7.3.0: Parse error: syntax error, unexpected '$el' (T_VARIABLE), expecting '(' in /in/JIbOv on line 40
Process exited with code 255.
Output for 5.6.11: Parse error: syntax error, unexpected ':', expecting '{' in /in/JIbOv on line 33
Process exited with code 255.
Output for 5.4.12, 5.5.1: Fatal error: Default value for parameters with a class type hint can only be NULL in /in/JIbOv on line 33
Process exited with code 255.
Output for 4.3.6: Parse error: parse error, unexpected '[' in /in/JIbOv on line 14
Process exited with code 255.

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