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run code in 200+ php & hhvm versions
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<?php class Tr{ function __construct(){ } } function Tr(){ return implode(func_get_args()); } function P(){ return "<p>"; } var_dump(Tr(Tr(P())));
based on ea6tX
Output for 4.3.0 - 7.2.0
string(3) "<p>"