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run code in 200+ php & hhvm versions
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<?php var_dump(base64_encode('test:test'));
Output for 5.6.0 - 5.6.30, hhvm-3.18.4 - 3.21.0, 7.0.0 - 7.3.0beta1
string(12) "dGVzdDp0ZXN0"