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<?php function a_test($str) { echo "\nHi: $str"; var_dump(debug_backtrace()); } a_test('friend');
Output for 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Hi: friendarray(1) { [0]=> array(4) { ["file"]=> string(9) "/in/clTrR" ["line"]=> int(8) ["function"]=> string(6) "a_test" ["args"]=> array(1) { [0]=> string(6) "friend" } } }
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40
Hi: friendarray(1) { [0]=> array(4) { ["file"]=> string(9) "/in/clTrR" ["line"]=> int(8) ["function"]=> string(6) "a_test" ["args"]=> array(1) { [0]=> &string(6) "friend" } } }

preferences:
253.3 ms | 402 KiB | 411 Q