<?php // filename: /tmp/a.php function a_test($str) { echo "\nhi: $str"; var_dump(debug_backtrace()); } a_test('friend'); ?>
<?php // filename: /tmp/b.php include_once '/tmp/a.php'; ?>
结果
hi: friend array(2) { [0]=> array(4) { ["file"] => string(10) "/tmp/a.php" ["line"] => int(10) ["function"] => string(6) "a_test" ["args"]=> array(1) { [0] => &string(6) "friend" } } [1]=> array(4) { ["file"] => string(10) "/tmp/b.php" ["line"] => int(2) ["args"] => array(1) { [0] => string(10) "/tmp/a.php" } ["function"] => string(12) "include_once" } }