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<?php $strings = [ 'dir1summary', 'dir10summary', 'dir1summarydue', 'dir10summarydue', 'directive1', 'directive10', 'directivecode1', 'directivecode10', ]; foreach ($strings as $string) { sscanf($string, '%[^0-9]%d%s', $dir, $num, $str); printf("%s%s%02d\n", str_pad($dir, 9, 'ective'), $str, $num); }

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