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run code in 200+ php & hhvm versions
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<?php var_dump( base64_decode(base64_encode("Foo bar")) ,base64_decode(base64_encode("Foo bar")."#$%^&*") ,base64_decode("#$%^&*".base64_encode("Foo bar")) ,base64_decode("#$%^&*") );
Output for 4.3.0 - 7.1.7
string(7) "Foo bar" string(7) "Foo bar" string(7) "Foo bar" string(0) ""