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<?php echo urlencode("members/mail/read.php?id=NdvIYRu4nybzN8B4zesUs6sjeTSwWUweBPlaAzuXrW8%253D");
Output for 5.6.30
members%2Fmail%2Fread.php%3Fid%3DNdvIYRu4nybzN8B4zesUs6sjeTSwWUweBPlaAzuXrW8%25253D