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run code in 300+ PHP versions simultaneously

@ 2019-05-14T11:58:02Z

<?php

$a = [
  1 => [
    "opens_at" => "10:00",
    "closes_at" => "18:00"
  ],
  2 => [
    "opens_at" => "10:00",
    "closes_at" => "18:00"
  ],
  3 => [
    "opens_at" => "10:00",
    "closes_at" => "18:00"
  ],
  4 => [
    "opens_at" => "14:00",
    "closes_at" => "17:00"
  ],
  5 => [
    "opens_at" => "14:00",
    "closes_at" => "17:00"
  ],
  6 => [
    "opens_at" => "18:00",
    "closes_at" => "19:00"
  ]
];

$groups = [];

foreach($a as $dayNumber => $w){
    if(!array_key_exists($w['opens_at'] . '-' . $w['closes_at'], $groups)){
        $groups[$w['opens_at'] . '-' . $w['closes_at']] = [];
    }
    
    $groups[$w['opens_at'] . '-' . $w['closes_at']][] = $dayNumber;
}

$res = array_map(function($v){
    return implode(', ', $v);
}, $groups);

var_dump(array_flip($res));

Output for 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.28, 8.4.1 - 8.4.14, 8.5.0 - 8.5.1: array(3) { ["1, 2, 3"]=> string(11) "10:00-18:00" ["4, 5"]=> string(11) "14:00-17:00" [6]=> string(11) "18:00-19:00" }
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.

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