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@ 2023-09-06T06:30:41Z

<?php

$array = [
    '1.1',
    '1.2',
    '1.3',
    '2.1',
    '2.2',
    '2.3',
    '3.1',
    '3.2',
];

$result = [];
foreach ($array as $v) {
    sscanf($v, '%d', $major);
    if (!isset($ref[$major])) {
        $result[] = &$ref[$major];
    }
    $ref[$major][] = $v;
}
var_export($result);

Output
Performance
VLD
References
Branches

sscanf: documentation ( source)
var_export: documentation ( source)

preferences:dark modelive preview

44.64 ms | 404 KiB | 5 Q