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run code in 200+ php & hhvm versions
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<?php var_dump(base64_decode('ZmlsZQ==')); var_dump(base64_decode('dG1wX25hbwU=')); var_dump(base64_decode('ZmlsZQ==')); var_dump(base64_decode('bmFtZQ=='));
based on KndQN
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.3.0rc3
string(4) "file" string(8) "tmp_nao" string(4) "file" string(4) "name"