<?php $radius = 3; $blank = ' '; for ($i = 1, $diameter = $radius * 2 - 1; $i <= $diameter; $i++) { $nums = range(1, $i); $nums = array_merge($nums, array_reverse(array_slice($nums, 0, -1))); $blanks = array_fill(0, $diameter - $i, $blank); $row = array_merge($blanks, $nums, $blanks); echo join($row); }
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