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@ 2018-11-09T20:37:24Z

<?php

function variations($digits, $prefix = '') {
    $result = [];
    
    for ($i = 1; $i <= 3; $i++) {
        $variation = $prefix . $i;
        
        if ($digits > 1) {
            $result = array_merge($result, variations($digits - 1, $variation));
        } else {
            $result[] = $variation;
        }
    }
    
    return $result;
}

print_r(variations(1));

Output
Performance
VLD
References
Branches

print_r: documentation ( source)
array_merge: documentation ( source)

preferences:dark modelive previewkey bindings

26.77 ms | 405 KiB | 5 Q