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<?php var_dump(quoted_printable_encode('aaaaaa aaaaaaaaaaa aaaaaaaaaaaa aaaaaaaaaaaa aaaaaaaaaaaaaa aaaaaaaaaaaaa aaaaaaaaaaaaaa aaaaaaaaaaaa aaaaaaaaaaaaa aaaaaaaaa a a a aaaaaaaaaaaaaa aaaaaaaaaa a aaaaaaaaaaaaaa aaaaaaaaaaaaa aaaaaaaaaaaaaa aa a aaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaa aaaaaaaaaaa aaaaaaaaaaaaaaa aaaaaaaaaaaaaa aaaaaaaaaaaa aaaaaaaaaaaaa aaaaaaaaaaaaa a a a a aaaaa aaaaaa aaa aaaaaaaaa aaaaaaaaaaaa'));
Output for 7.1.7
string(393) "aaaaaa aaaaaaaaaaa aaaaaaaaaaaa aaaaaaaaaaaa aaaaaaaaaaaaaa aaaaaaaaaaaaa a= aaaaaaaaaaaaa aaaaaaaaaaaa aaaaaaaaaaaaa aaaaaaaaa a a a aaaaaaaaaaaaaa aaa= aaaaaaa a aaaaaaaaaaaaaa aaaaaaaaaaaaa aaaaaaaaaaaaaa aa a aaaaaaaaaaaaaaa= a aaaaaaaaaaaaaaaaaaa aaaaaaaaaaa aaaaaaaaaaaaaaa aaaaaaaaaaaaaa aaaaaaaaaa= aa aaaaaaaaaaaaa aaaaaaaaaaaaa a a a a aaaaa aaaaaa aaa aaaaaaaaa aaaaaaaaa= aaa"