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<?php $a = [1, 2]; usort($a, function ($a, $b) { var_dump(debug_backtrace()); exit; });
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(2) { ["function"]=> string(9) "{closure}" ["args"]=> array(2) { [0]=> int(1) [1]=> int(2) } } [1]=> array(4) { ["file"]=> string(9) "/in/j9Dv7" ["line"]=> int(4) ["function"]=> string(5) "usort" ["args"]=> array(2) { [0]=> array(2) { [0]=> int(1) [1]=> int(2) } [1]=> object(Closure)#1 (1) { ["parameter"]=> array(2) { ["$a"]=> string(10) "<required>" ["$b"]=> string(10) "<required>" } } } } }

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