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<?php function swapOutermost(&$a, $i = 0) { $last = count($a) - 1 - $i; if ($i < $last) { [$a[$i], $a[$last]] = [$a[$last], $a[$i]]; swapOutermost($a, ++$i); } } $array = [1, 2, 3, 4, 5, 6, 7]; swapOutermost($array); var_export($array);
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
array ( 0 => 7, 1 => 6, 2 => 5, 3 => 4, 4 => 3, 5 => 2, 6 => 1, )
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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171.76 ms | 407 KiB | 5 Q