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run code in 200+ php & hhvm versions
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<?php function f($a){ print_r(debug_backtrace()); } $var = 1; f($var);
Output for 4.3.0 - 7.2.6
Array ( [0] => Array ( [file] => /in/O6a97 [line] => 6 [function] => f [args] => Array ( [0] => 1 ) ) )