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<?php $payload = ['A', 'B', 'C', 'D']; $total = (1 << count($payload)) - 1; $result = []; for($i = 1; $i <= $total; ++$i){ if(($i & ($i - 1)) == 0) continue; // avoiding single items since you don't wish to have them $curr = []; for($j = 0; $j < count($payload); ++$j){ if(($i & (1 << $j)) > 0){ $curr[] = $payload[ $j ]; } } $result[] = $curr; } usort($result, function($a, $b){ return strcmp( implode("|", $a), implode("|", $b) ); }); print_r($result);
Output for 8.0.1 - 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
Array ( [0] => Array ( [0] => A [1] => B ) [1] => Array ( [0] => A [1] => B [2] => C ) [2] => Array ( [0] => A [1] => B [2] => C [3] => D ) [3] => Array ( [0] => A [1] => B [2] => D ) [4] => Array ( [0] => A [1] => C ) [5] => Array ( [0] => A [1] => C [2] => D ) [6] => Array ( [0] => A [1] => D ) [7] => Array ( [0] => B [1] => C ) [8] => Array ( [0] => B [1] => C [2] => D ) [9] => Array ( [0] => B [1] => D ) [10] => Array ( [0] => C [1] => D ) )
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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