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<?php function foo(&$a) { $a = 10; var_dump(debug_backtrace()); } $x = 5; foo($x);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> array(4) { ["file"]=> string(9) "/in/fOrXL" ["line"]=> int(9) ["function"]=> string(3) "foo" ["args"]=> array(1) { [0]=> int(10) } } }

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