3v4l.org

run code in 300+ PHP versions simultaneously

@ 2019-12-20T20:08:36Z

<?php
$comments='[
    {
        "user": "5",
        "points": "12"
    },
    {
        "user": "2",
        "points": "1"
    },
    {
        "user": "3",
        "points": "1"
    }
]';
$likes='[
    {
        "user": "1",
        "points": 7
    },
    {
        "user": "4",
        "points": 4
    },
    {
        "user": "3",
        "points": 1
    }
]';
$posts='[
    {
        "user": "1",
        "points": "6"
    },
    {
        "user": "3",
        "points": "2"
    },
    {
        "user": "2",
        "points": "1"
    }
]';

$merged = array_merge(json_decode($comments, true), json_decode($likes, true), json_decode($posts, true));
$result = [];
foreach ($merged as $entry) {
    if (!isset($result[$entry['user']])) {
        $result[$entry['user']] = $entry;
    } else {
        $result[$entry['user']]['points'] += $entry['points'];
    }
}
array_multisort(array_column($result, 'user'), $result);
//usort($result, function($a, $b) { return $a['user']<=>$b['user']; });  // this is the most modern style, change if too advanced for your php version
echo json_encode($result);

Output for 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: [{"user":"1","points":13},{"user":"2","points":2},{"user":"3","points":4},{"user":"4","points":4},{"user":"5","points":"12"}]
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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