Online PHP editor | perf for 9qWTh

<?php error_reporting(E_ALL & ~E_DEPRECATED); // test serialize() functionality on shutdown register_shutdown_function('shutdown_serialize_test'); function shutdown_serialize_test() { $bug_test = new stdClass(); $bug_test_serialized = serialize([$bug_test, $bug_test]); $bug_test_unserialized = unserialize($bug_test_serialized); if ($bug_test_unserialized === false) { echo "\nserialize() / unserialize() round trip failed on shutdown\n"; } $reference_serialized = 'a:2:{i:0;O:8:"stdClass":0:{}i:1;r:2;}'; if ($bug_test_serialized !== $reference_serialized) { echo "serialize() on shutdown does not match reference:\n"; echo "$bug_test_serialized\n"; echo "should be:\n"; echo "$reference_serialized\n"; } } // records $test into trace function crash_step_1($test) { crash_step_2(debug_backtrace()); } // works on the first trace and serializes it, which triggers the second trace function crash_step_2($trace1) { $new_trace = []; foreach ($trace1 as $traceline) { if (isset($traceline['args'])) { $new_args = []; foreach ($traceline['args'] as $traceline_arg) { $new_args[] = $traceline_arg; } $traceline['args'] = $new_args; // this fails as well # $traceline['args'] = $traceline['args']; } $new_trace[] = $traceline; } return serialize($new_trace); } class class_crash_step_3 { protected function trace2() { $trace2 = debug_backtrace(); $var_list = []; foreach ($trace2 as $traceline) { if (!isset($traceline['args'])) continue; foreach ($traceline['args'] as $tracearg) { $var_idx = false; foreach ($var_list as $found_idx => $var_list_item) { // eventually, this comparison triggers the Fatal error if ($var_list_item === $tracearg) { $var_idx = $found_idx; break; } } if ($var_idx === false) { $var_list[] = $tracearg; } } } } } // this one triggers "Fatal error: Nesting level too deep - recursive dependency?" // and corrupts serialize() during shutdown, also affecting session handlers class class_crash_step_3_variant_A extends class_crash_step_3 implements Serializable { public function serialize() { $this->trace2(); } public function unserialize($data) { } } // interface Serializable is deprecated. with magic methods, corruption does not occur, // but "Fatal error: Nesting level too deep - recursive dependency?" is still triggered class class_crash_step_3_variant_B extends class_crash_step_3 { public function __serialize() { $this->trace2(); } public function __unserialize($data) { } } $test = new class_crash_step_3_variant_A(); #$test = new class_crash_step_3_variant_B(); crash_step_1($test); echo "End of script";

Version	System time (s)	User time (s)	Memory (MiB)
8.4.14	0.013	0.009	17.59
8.4.13	0.013	0.007	18.82
8.4.12	0.007	0.011	24.00
8.4.11	0.005	0.007	20.52
8.4.10	0.012	0.009	19.09
8.4.9	0.013	0.007	20.33
8.4.8	0.007	0.002	18.85
8.4.7	0.012	0.008	18.38
8.4.6	0.008	0.012	18.83
8.4.5	0.010	0.009	18.93
8.4.4	0.013	0.009	17.80
8.4.3	0.006	0.013	18.61
8.4.2	0.013	0.006	19.70
8.4.1	0.013	0.006	19.71
8.3.27	0.010	0.010	16.68
8.3.26	0.005	0.004	16.79
8.3.25	0.011	0.007	18.81
8.3.24	0.011	0.009	18.85
8.3.23	0.005	0.004	16.73
8.3.22	0.004	0.004	19.10
8.3.21	0.004	0.003	16.87
8.3.20	0.005	0.004	16.88
8.3.19	0.009	0.010	17.28
8.3.18	0.009	0.011	17.29
8.3.17	0.007	0.011	20.96
8.3.16	0.016	0.003	16.65
8.3.15	0.014	0.004	17.26
8.3.14	0.004	0.004	17.55
8.3.13	0.000	0.008	18.50
8.3.12	0.003	0.006	20.44
8.3.11	0.005	0.003	18.63
8.3.10	0.011	0.004	16.75
8.3.9	0.000	0.008	26.77
8.3.8	0.005	0.008	18.88
8.3.7	0.006	0.003	30.84
8.3.5	0.006	0.003	30.84
8.2.29	0.008	0.010	20.27
8.2.28	0.012	0.007	18.55
8.2.27	0.011	0.007	17.39
8.2.26	0.010	0.010	18.32
8.2.25	0.007	0.003	19.06
8.2.24	0.008	0.000	18.77
8.2.23	0.010	0.000	20.94
8.2.22	0.004	0.004	24.06
8.2.21	0.009	0.009	26.77
8.2.20	0.012	0.000	30.84
8.2.19	0.009	0.003	30.84
8.1.33	0.007	0.002	22.24
8.1.32	0.010	0.007	20.14
8.1.31	0.006	0.015	16.97
8.1.30	0.006	0.003	17.98
8.1.29	0.006	0.006	30.84
8.1.28	0.007	0.003	30.84
7.3.0	0.015	0.003	30.84
7.2.33	0.007	0.009	30.84