3v4l.org

run code in 300+ PHP versions simultaneously
<?php function countRefs(&$var) { ob_start(); debug_zval_dump(&$var); preg_match('~refcount\((\d+)\)~', ob_get_clean(), $matches); return $matches[1] - 4; } $a = 0; $a = &$a; echo countRefs($a); $a = &$a; echo countRefs($a);

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
5.4.270.0070.05018.84
5.4.260.0100.04719.00
5.4.250.0070.05318.81
5.4.240.0130.04318.89
5.4.230.0070.05018.93
5.4.220.0200.05018.94
5.4.210.0100.05018.98
5.4.200.0130.04318.89
5.4.190.0070.05018.76
5.4.180.0070.05018.94
5.4.170.0100.05018.95
5.4.160.0100.04718.97
5.4.150.0100.05018.82
5.4.140.0130.04316.48
5.4.130.0030.05016.38
5.4.120.0070.04716.51
5.4.110.0070.05016.33
5.4.100.0100.04716.49
5.4.90.0100.04716.65
5.4.80.0100.04316.64
5.4.70.0200.03716.47
5.4.60.0100.05716.54
5.4.50.0130.04016.29
5.4.40.0100.04716.59
5.4.30.0100.04716.46
5.4.20.0130.04016.41
5.4.10.0130.04716.51
5.4.00.0030.05315.85
5.3.290.0040.04112.80
5.3.280.0100.05014.68
5.3.270.0100.05014.77
5.3.260.0070.05014.61
5.3.250.0100.04714.68
5.3.240.0030.05314.69
5.3.230.0130.04314.82
5.3.220.0070.05014.63
5.3.210.0070.05014.65
5.3.200.0100.05314.54
5.3.190.0130.04314.55
5.3.180.0070.04714.56
5.3.170.0130.04314.65
5.3.160.0130.04314.39
5.3.150.0130.04314.55
5.3.140.0070.05014.64
5.3.130.0100.05014.63
5.3.120.0000.05714.53
5.3.110.0170.04314.77
5.3.100.0130.04314.17
5.3.90.0070.05013.99
5.3.80.0030.05314.09
5.3.70.0170.03714.11
5.3.60.0070.05014.16
5.3.50.0170.03714.02
5.3.40.0070.04714.04
5.3.30.0170.03714.13
5.3.20.0070.05013.92
5.3.10.0070.04713.72
5.3.00.0070.05013.61
5.2.170.0070.04011.23
5.2.160.0100.03311.32
5.2.150.0070.05011.21
5.2.140.0030.04311.11
5.2.130.0100.03311.11
5.2.120.0030.04011.32
5.2.110.0030.04011.05
5.2.100.0030.04011.09
5.2.90.0100.03311.07
5.2.80.0030.04011.11
5.2.70.0100.03311.27
5.2.60.0000.04311.04
5.2.50.0100.03310.99
5.2.40.0000.04311.17
5.2.30.0030.04011.04
5.2.20.0070.03711.18
5.2.10.0070.03710.92
5.2.00.0000.04310.68
5.1.60.0130.02310.06
5.1.50.0100.02710.06
5.1.40.0030.03310.02
5.1.30.0070.03310.55
5.1.20.0000.04010.26
5.1.10.0130.02310.11
5.1.00.0000.04010.14
5.0.50.0030.0308.55
5.0.40.0070.0238.33
5.0.30.0030.0508.14
5.0.20.0030.0278.03
5.0.10.0070.0338.17
5.0.00.0030.0438.12
4.4.90.0070.0177.24
4.4.80.0030.0207.24
4.4.70.0070.0177.24
4.4.60.0070.0237.24
4.4.50.0000.0237.24
4.4.40.0070.0307.24
4.4.30.0000.0237.24
4.4.20.0030.0307.25
4.4.10.0030.0207.25
4.4.00.0000.0337.25
4.3.110.0030.0207.25
4.3.100.0030.0237.24
4.3.90.0030.0207.25
4.3.80.0100.0237.25
4.3.70.0100.0207.25
4.3.60.0070.0137.25
4.3.50.0000.0237.25
4.3.40.0030.0307.25
4.3.30.0030.0207.25
4.3.20.0000.0237.25
4.3.10.0030.0207.24
4.3.00.0070.0237.75

preferences:
140.15 ms | 1394 KiB | 7 Q