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<?php $headers = <<<HEADERS # Hello ## World ### Let's add ## Some headers ### Yay! # Foo ## Bar ## Bar Again HEADERS; $levels = []; echo preg_replace_callback( '~^(#+)\K~m', function($m) use (&$levels) { $hashes = strlen($m[1]); $index = $hashes - 1; $reduction = sizeof($levels) - $hashes; if (!isset($levels[$index])) { $levels[$index] = 1; } else { ++$levels[$index]; } if ($reduction > 0) { $levels = array_slice($levels, 0, -$reduction); } return " " . implode('.', $levels); }, $headers );
Output for git.master, git.master_jit, rfc.property-hooks
# 1 Hello ## 1.1 World ### 1.1.1 Let's add ## 1.2 Some headers ### 1.2.1 Yay! # 2 Foo ## 2.1 Bar ## 2.2 Bar Again

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