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<?php $um = [ '\\\\' => '\\', '\\n' => "[NL]", ]; $inputs = []; for ($i=1;$i<=14;$i++) { $inputs[] = ''.str_repeat("\\", $i)."n"; } foreach ($inputs as $input) { $results[] = strtr($input, $um); } foreach ($inputs as $key=>$value) { echo str_pad($value, 15, ' ',STR_PAD_LEFT)." =======> ".$results[$key]."\n"; }

preferences:
24.89 ms | 406 KiB | 5 Q