3v4l.org

run code in 300+ PHP versions simultaneously
<pre><?php $var1 = 'ccc'; $var2 = 'ccc'; echo "separate variables\n"; debug_zval_dump($var1, $var2); echo "Copying variable just adds references to the same value\n"; $copy = $var1; debug_zval_dump($var1, $copy); echo "Using a reference adds references to the same value \n"; $reference =& $var2; debug_zval_dump(&$var2, &$reference); echo "Using a copy and a reference of the same value actually creates a clone \n"; $reference2 =& $var1; debug_zval_dump(&$var1, $copy, &$reference2);

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)
5.4.320.0050.04212.46
5.4.310.0050.04312.46
5.4.300.0050.03712.46
5.4.290.0090.03612.46
5.4.280.0090.03312.36
5.4.270.0020.04112.36
5.4.260.0090.04112.36
5.4.250.0070.03712.36
5.4.240.0060.03512.36
5.4.230.0080.03812.35
5.4.220.0100.03212.35
5.4.210.0060.03512.35
5.4.200.0050.03812.35
5.4.190.0060.03512.34
5.4.180.0080.03812.34
5.4.170.0050.03912.36
5.4.160.0080.03812.36
5.4.150.0070.04212.35
5.4.140.0060.03712.04
5.4.130.0080.03412.02
5.4.120.0090.03311.98
5.4.110.0050.03711.97
5.4.100.0080.03311.98
5.4.90.0050.03711.97
5.4.80.0100.04111.98
5.4.70.0050.03811.97
5.4.60.0040.03611.98
5.4.50.0060.03611.97
5.4.40.0040.03711.96
5.4.30.0070.03411.96
5.4.20.0030.03811.96
5.4.10.0040.03711.96
5.4.00.0050.03611.45
5.3.290.0040.04512.80
5.3.280.0090.03812.71
5.3.270.0080.03912.72
5.3.260.0090.04712.72
5.3.250.0070.04112.72
5.3.240.0100.03812.72
5.3.230.0080.03712.71
5.3.220.0070.03612.68
5.3.210.0070.03812.68
5.3.200.0080.03612.68
5.3.190.0070.04312.68
5.3.180.0080.04412.67
5.3.170.0090.03712.67
5.3.160.0100.04912.68
5.3.150.0080.03812.68
5.3.140.0130.04712.66
5.3.130.0130.03712.66
5.3.120.0070.03912.66
5.3.110.0070.03912.66
5.3.100.0070.03712.11
5.3.90.0090.03312.08
5.3.80.0050.03712.08
5.3.70.0090.03512.07
5.3.60.0080.03512.06
5.3.50.0060.03712.00
5.3.40.0080.03612.00
5.3.30.0090.03511.95
5.3.20.0070.03611.73
5.3.10.0070.03611.69
5.3.00.0050.03811.68
5.2.170.0080.0359.18
5.2.160.0060.0299.18
5.2.150.0100.0269.18
5.2.140.0030.0339.18
5.2.130.0080.0279.14
5.2.120.0030.0309.14
5.2.110.0050.0299.14
5.2.100.0050.0299.14
5.2.90.0050.0289.14
5.2.80.0040.0329.13
5.2.70.0070.0289.14
5.2.60.0060.0299.09
5.2.50.0070.0279.06
5.2.40.0080.0269.03
5.2.30.0110.0339.01
5.2.20.0040.0319.00
5.2.10.0070.0298.92
5.2.00.0020.0318.78
5.1.60.0060.0228.06
5.1.50.0040.0268.06
5.1.40.0060.0238.05
5.1.30.0040.0278.39
5.1.20.0040.0328.42
5.1.10.0060.0258.14
5.1.00.0040.0268.14
5.0.50.0040.0206.62
5.0.40.0030.0206.47
5.0.30.0060.0296.29
5.0.20.0070.0176.26
5.0.10.0030.0206.24
5.0.00.0050.0296.23
4.4.90.0010.0174.78
4.4.80.0020.0164.75
4.4.70.0030.0154.75
4.4.60.0010.0174.76
4.4.50.0030.0154.77
4.4.40.0020.0264.71
4.4.30.0020.0164.76
4.4.20.0030.0154.84
4.4.10.0070.0114.85
4.4.00.0010.0264.76
4.3.110.0040.0144.67
4.3.100.0050.0124.67
4.3.90.0000.0174.63
4.3.80.0030.0244.59
4.3.70.0030.0144.63
4.3.60.0050.0124.63
4.3.50.0050.0174.63
4.3.40.0020.0254.54
4.3.30.0020.0163.29
4.3.20.0010.0173.26
4.3.10.0030.0153.22
4.3.00.0070.01318.56

preferences:
142.11 ms | 1394 KiB | 7 Q