3v4l.org

run code in 300+ PHP versions simultaneously
<?php function isReference(&$xVal) { ob_start(); debug_zval_dump(&$xVal); $dump = ob_get_clean(); preg_match('/refcount\((\d*)\)/',$dump,$matches); if ($matches[1] > 4) { return true; } else { return false; } } $text = 'Anything'; var_dump( isReference(&$text) ); var_dump( isReference($text) );

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)
5.4.250.0070.03812.38
5.4.240.0060.03712.38
5.4.230.0050.04012.37
5.4.220.0070.03912.37
5.4.210.0060.03812.37
5.4.200.0090.03812.37
5.4.190.0050.04312.37
5.4.180.0060.04312.37
5.4.170.0080.04312.38
5.4.160.0080.04112.38
5.4.150.0090.04312.37
5.4.140.0070.04312.06
5.4.130.0050.04512.04
5.4.120.0100.04612.00
5.4.110.0100.04511.99
5.4.100.0070.04312.00
5.4.90.0070.04612.00
5.4.80.0070.04512.00
5.4.70.0040.03811.99
5.4.60.0060.03611.99
5.4.50.0080.03511.99
5.4.40.0060.03911.98
5.4.30.0070.03411.97
5.4.20.0080.03711.97
5.4.10.0060.03411.97
5.4.00.0070.04211.47
5.3.290.0060.03912.80
5.3.280.0090.04312.71
5.3.270.0050.04512.72
5.3.260.0050.04212.72
5.3.250.0060.03612.72
5.3.240.0060.04012.72
5.3.230.0040.04312.71
5.3.220.0040.03912.68
5.3.210.0050.03912.68
5.3.200.0050.04012.68
5.3.190.0090.03812.68
5.3.180.0090.03812.67
5.3.170.0090.04312.67
5.3.160.0090.04212.68
5.3.150.0070.04312.67
5.3.140.0080.04212.66
5.3.130.0090.04112.66
5.3.120.0050.04012.66
5.3.110.0090.04312.66
5.3.100.0060.03912.12
5.3.90.0080.03912.10
5.3.80.0080.03512.08
5.3.70.0070.03912.08
5.3.60.0050.04012.07
5.3.50.0060.04112.01
5.3.40.0070.03912.01
5.3.30.0080.04611.98
5.3.20.0070.04111.76
5.3.10.0080.04011.72
5.3.00.0050.04211.70
5.2.170.0080.0349.21
5.2.160.0070.0439.21
5.2.150.0070.0409.21
5.2.140.0050.0449.21
5.2.130.0050.0359.16
5.2.120.0080.0369.17
5.2.110.0070.0389.17
5.2.100.0070.0349.18
5.2.90.0060.0369.17
5.2.80.0070.0459.16
5.2.70.0040.0359.16
5.2.60.0070.0319.11
5.2.50.0050.0309.09
5.2.40.0050.0329.06
5.2.30.0040.0349.05
5.2.20.0060.0359.04
5.2.10.0050.0308.94
5.2.00.0050.0338.79
5.1.60.0040.0258.07
5.1.50.0040.0258.07
5.1.40.0070.0258.06
5.1.30.0050.0268.41
5.1.20.0050.0268.43
5.1.10.0040.0288.15
5.1.00.0040.0278.14
5.0.50.0070.0206.63
5.0.40.0040.0196.48
5.0.30.0040.0366.30
5.0.20.0040.0206.28
5.0.10.0040.0216.24
5.0.00.0040.0336.23
4.4.90.0020.0174.78
4.4.80.0040.0174.75
4.4.70.0030.0184.75
4.4.60.0040.0204.75
4.4.50.0020.0164.77
4.4.40.0020.0274.71
4.4.30.0030.0164.76
4.4.20.0020.0164.85
4.4.10.0040.0184.85
4.4.00.0030.0274.76
4.3.110.0050.0154.67
4.3.100.0020.0194.66
4.3.90.0040.0164.63
4.3.80.0040.0254.58
4.3.70.0020.0154.63
4.3.60.0040.0184.63
4.3.50.0020.0184.63
4.3.40.0030.0254.54
4.3.30.0020.0153.30
4.3.20.0020.0163.28
4.3.10.0030.0183.24
4.3.00.0130.0207.30

preferences:
141.04 ms | 1394 KiB | 7 Q