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run code in 150+ php & hhvm versions
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<?php $width = 10; foreach (range(1, $width) as $i) { printf("%{$width}s\n", join(array_reverse(range(1, $i)))); }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
1 21 321 4321 54321 654321 7654321 87654321 987654321 10987654321