Online PHP editor | perf for FWgS8

<?php function vars_are_referenced (&$var1, &$var2) { // What we are doing *will* throw an error (I said it was nasty ;-) ) $oldER = error_reporting(); $oldDE = ini_get('display_errors'); error_reporting(0); ini_set('display_errors', 0); // We need to use output buffering, we don't want to break any existing // buffering so we cache the contents of the buffer $oldBuffer = ob_get_length() ? ob_get_clean() : NULL; // If the values are not identical, definitely not a match if ($var1 !== $var2) return FALSE; // Now we inspect the zval of $var1 ob_start(); debug_zval_dump(&$var1); preg_match('/\brefcount$(\d+)$(?:\b|$)/', ob_get_clean(), $matches); $var1RefCountBefore = (int) $matches[1]; // If they are the same, this will increase the refcount $temp = &$var2; // Inspect the zval of $var1 again ob_start(); debug_zval_dump(&$var1); preg_match('/\brefcount$(\d+)$(?:\b|$)/', ob_get_clean(), $matches); $var1RefCountAfter = (int) $matches[1]; // If refcount is now greater, they are the same $result = $var1RefCountAfter > $var1RefCountBefore; // Repopulate the output buffer if necessary if ($oldBuffer !== NULL) { ob_start(); echo $oldBuffer; } // Turn error reporting back to correct level error_reporting($oldER); ini_set('display_errors', $oldDE); return $result; } function test_ref_fail () { $a = 1; $var_name = 'a'; var_dump(vars_are_referenced($GLOBALS['a'], $a)); } function test_ref_success_1 () { global $a; $var_name = 'a'; var_dump(vars_are_referenced($GLOBALS['a'], $a)); } function test_ref_success_2 (&$a) { $var_name = 'a'; var_dump(vars_are_referenced($GLOBALS['a'], $a)); } $a = 1; $b = &$a; var_dump(vars_are_referenced($a, $b)); test_ref_fail(); test_ref_success_1(); test_ref_success_2($a); ?>

Version	System time (s)	User time (s)	Memory (MiB)
5.4.14	0.013	0.043	12.07
5.4.13	0.011	0.044	12.06
5.4.12	0.012	0.041	12.02
5.4.11	0.009	0.046	12.01
5.4.10	0.013	0.041	12.02
5.4.9	0.010	0.044	12.01
5.4.8	0.018	0.058	12.02
5.4.7	0.012	0.037	12.01
5.4.6	0.010	0.040	12.01
5.4.5	0.008	0.041	12.01
5.4.4	0.011	0.040	12.00
5.4.3	0.008	0.044	12.00
5.4.2	0.011	0.043	12.00
5.4.1	0.012	0.042	11.99
5.4.0	0.010	0.044	11.49
5.3.29	0.005	0.039	12.80
5.3.28	0.012	0.043	12.71
5.3.27	0.012	0.047	12.73
5.3.26	0.011	0.048	12.72
5.3.25	0.012	0.048	12.72
5.3.24	0.013	0.052	12.72
5.3.23	0.012	0.042	12.71
5.3.22	0.010	0.041	12.68
5.3.21	0.011	0.042	12.68
5.3.20	0.011	0.041	12.68
5.3.19	0.010	0.043	12.68
5.3.18	0.012	0.058	12.67
5.3.17	0.013	0.047	12.67
5.3.16	0.015	0.060	12.67
5.3.15	0.013	0.050	12.67
5.3.14	0.013	0.047	12.67
5.3.13	0.013	0.049	12.66
5.3.12	0.011	0.050	12.66
5.3.11	0.011	0.049	12.66
5.3.10	0.011	0.048	12.14
5.3.9	0.016	0.057	12.13
5.3.8	0.011	0.049	12.12
5.3.7	0.010	0.048	12.12
5.3.6	0.011	0.047	12.10
5.3.5	0.008	0.049	12.05
5.3.4	0.013	0.054	12.05
5.3.3	0.009	0.047	12.01
5.3.2	0.010	0.045	11.79
5.3.1	0.012	0.037	11.76
5.3.0	0.010	0.044	11.74