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run code in 150+ php & hhvm versions
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<?php var_dump(base64_decode('V1RGPw==')); var_dump(base64_decode('V1===RGPw')); var_dump(base64_decode('cD0xODY====mcz1jMTQ1OWQ4OCZmPTE'));
Output for 5.2.9 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
string(4) "WTF?" string(4) "WTF?" string(20) "p=186&s=c1459d88&f=1"
Output for 4.3.0 - 5.2.8
string(4) "WTF?" string(1) "W" string(5) "p=186"