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<?php $tree = [ '' => function () { return [ 1 ]; }, 1 => function () { return [ 2, 3, 4 ]; }, 2 => function () { return [ 5, 6 ]; }, 3 => function () { return [ 7, 8 ]; }, ]; $queue = new \SplQueue(); $queue->enqueue([ '', 0 ]); while ( ! $queue->isEmpty() ) { [ $parent, $level ] = $queue->dequeue(); echo str_repeat(' ', $level) . $parent . PHP_EOL; $children = isset($tree[ $parent ]) ? $tree[ $parent ]() : []; foreach ( $children as $child ) { $queue->enqueue([ $child, $level + 1 ]); } }
Output for 7.4.0 - 7.4.33, 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
1 2 3 4 5 6 7 8
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.
preferences:
142.92 ms | 407 KiB | 5 Q