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<?php var_dump(base64_decode('V1RGPw==')); var_dump(base64_decode('V1RGPw')); var_dump(base64_decode('V=1==R===GPw=='));
Output for 7.1.0
string(4) "WTF?" string(4) "WTF?" string(4) "WTF?"
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.0.14
string(4) "WTF?" string(4) "WTF?" bool(false)