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@ 2018-11-02T11:44:50Z

<?php
$aUserFiles = [
    0 => [
        'file' => 'file 1',
        'semesters' => [
            3
        ]
    ],
    1 => [
        'file' => 'file 2',
        'semesters' => [
            3,4 
        ]
    ],
    2 => [
        'file' => 'file 3',
        'semesters' => [
            1,2
        ]
    ],
    3 => [
        'file' => 'file 4',
        'semesters' => [
            3,4,5,6
        ]
    ]
];

$requiredSemesters = 3;
$indicators = [];
$result = [];

foreach ($aUserFiles as $key => $file) {
    $first = $file['semesters'][0];
    $last = $file['semesters'][count($file['semesters']) - 1];
    $filesInRangeCount = count(array_intersect($file['semesters'], range(1, $requiredSemesters)));
    
    if (!isset($indicators[$first]) || $indicators[$first]['range'] < $filesInRangeCount) {
        $indicators[$first] = ["key" => $key, "max" => $last, "range" => $filesInRangeCount];
    }
}

ksort($indicators);

$result = [];
$max = 0;

foreach ($indicators as $indicator) {
    if ($max >= $requiredSemesters) {
        break;
    }
    
    $result[] = $aUserFiles[$indicator['key']];
    $max = $indicator["max"];
}

print_r($result);

Output for 5.6.38, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.4, 8.3.6 - 8.3.7: Array ( [0] => Array ( [file] => file 3 [semesters] => Array ( [0] => 1 [1] => 2 ) ) [1] => Array ( [file] => file 1 [semesters] => Array ( [0] => 3 ) ) )
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 Array ( [0] => Array ( [file] => file 3 [semesters] => Array ( [0] => 1 [1] => 2 ) ) [1] => Array ( [file] => file 1 [semesters] => Array ( [0] => 3 ) ) )

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