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)
5.4.270.0110.04615.57
5.4.260.0150.03715.50
5.4.250.0100.04115.64
5.4.240.0070.04515.55
5.4.230.0120.03815.50
5.4.220.0080.04315.65
5.4.210.0050.04515.62
5.4.200.0080.05315.54
5.4.190.0050.04815.55
5.4.180.0110.04015.60
5.4.170.0140.03715.55
5.4.160.0110.05915.55
5.4.150.0060.05315.61
5.4.140.0100.04014.28
5.4.130.0100.03814.25
5.4.120.0080.04614.30
5.4.110.0060.04414.13
5.4.100.0100.03814.25
5.4.90.0060.04514.17
5.4.80.0050.04314.20
5.4.70.0090.03814.23
5.4.60.0100.04414.21
5.4.50.0080.04214.19
5.4.40.0050.04314.23
5.4.30.0130.03714.18
5.4.20.0110.04114.26
5.4.10.0040.04614.24
5.4.00.0060.05313.66
5.3.290.0090.04312.80
5.3.280.0050.06213.68
5.3.270.0060.05013.65
5.3.260.0050.06113.71
5.3.250.0080.04713.70
5.3.240.0050.04713.75
5.3.230.0040.05013.65
5.3.220.0120.05113.63
5.3.210.0060.04413.66
5.3.200.0070.04013.54
5.3.190.0090.04213.73
5.3.180.0060.05913.66
5.3.170.0070.04013.61
5.3.160.0110.05213.72
5.3.150.0120.05313.62
5.3.140.0050.04413.71
5.3.130.0130.04313.64
5.3.120.0120.05113.52
5.3.110.0130.03913.64
5.3.100.0110.04813.12
5.3.90.0060.05013.00
5.3.80.0100.04913.04
5.3.70.0100.04613.09
5.3.60.0040.04312.95
5.3.50.0080.04712.97
5.3.40.0070.05013.06
5.3.30.0070.04012.97
5.3.20.0070.04012.73
5.3.10.0110.03712.68
5.3.00.0040.04912.69
5.2.170.0100.03510.08
5.2.160.0090.03010.20
5.2.150.0090.03310.21
5.2.140.0040.03710.15
5.2.130.0120.03810.12
5.2.120.0040.03810.13
5.2.110.0070.03110.17
5.2.100.0050.03410.17
5.2.90.0050.03510.16
5.2.80.0050.03810.07
5.2.70.0050.03810.16
5.2.60.0070.0419.99
5.2.50.0070.04310.08
5.2.40.0030.03510.12
5.2.30.0060.03510.04
5.2.20.0040.03610.03
5.2.10.0040.0369.88
5.2.00.0070.0329.78
5.1.60.0020.0329.07
5.1.50.0090.0349.10
5.1.40.0060.0289.13
5.1.30.0050.0289.31
5.1.20.0030.0429.47
5.1.10.0050.0289.12
5.1.00.0060.0339.11
5.0.50.0050.0217.59
5.0.40.0060.0217.42
5.0.30.0030.0367.33
5.0.20.0020.0267.27
5.0.10.0020.0287.16
5.0.00.0020.0397.23
4.4.90.0020.0196.01
4.4.80.0010.0206.00
4.4.70.0050.0176.00
4.4.60.0040.0206.00
4.4.50.0020.0196.01
4.4.40.0040.0295.98
4.4.30.0020.0226.00
4.4.20.0020.0196.04
4.4.10.0050.0206.05
4.4.00.0020.0286.00
4.3.110.0040.0175.96
4.3.100.0030.0175.96
4.3.90.0040.0165.94
4.3.80.0020.0325.92
4.3.70.0060.0145.94
4.3.60.0050.0235.94
4.3.50.0010.0225.94
4.3.40.0030.0275.89
4.3.30.0010.0205.27
4.3.20.0020.0195.26
4.3.10.0020.0195.24
4.3.00.0030.0207.74

preferences:
160.3 ms | 1386 KiB | 7 Q