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run code in 150+ php & hhvm versions
Bugs & Features
<?php class Foo { public function __construct() { $bar = new Bar(); $bar->test(); } } class Bar { public function test() { $this->test2(); } public function test2() { list(, $caller) = debug_backtrace(false); echo $caller['class']; } } $foo = new Foo();
Output for 5.2.5 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Bar
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.0.0 - 5.2.4
Warning: Wrong parameter count for debug_backtrace() in /in/6mdPN on line 21
Output for 4.4.2 - 4.4.9
Parse error: syntax error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/6mdPN on line 5
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.4.1
Parse error: parse error, unexpected T_STRING, expecting T_OLD_FUNCTION or T_FUNCTION or T_VAR or '}' in /in/6mdPN on line 5
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error, expecting `T_OLD_FUNCTION' or `T_FUNCTION' or `T_VAR' or `'}'' in /in/6mdPN on line 5
Process exited with code 255.