3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo '<table border="1">'; echo '<tr><th>Value of variable ($var)</th><th>isset($var)</th><th>empty($var)</th><th>is_null($var)</th></tr>'; $var = ''; echo '<tr><td>"" (an empty string)</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = ' '; echo '<tr><td>" " (space)</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = FALSE; echo '<tr><td>FALSE</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = TRUE; echo '<tr><td>TRUE</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = array(); echo '<tr><td>array() (an empty array)</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = NULL; echo '<tr><td>NULL</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = '0'; echo '<tr><td>"0" (0 as a string)</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = 0; echo '<tr><td>0 (0 as an integer)</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = 0.0; echo '<tr><td>0.0 (0 as a float)</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; unset($var); // doing this just as a precaution, to make sure $var is actually not defined. $var; echo '<tr><td>var $var; (a variable declared, but without a value)</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; $var = '\0'; echo '<tr><td>NULL byte ("\ 0")</td><td>'; var_dump(isset($var)); echo '</td><td>'; var_dump(empty($var)); echo '</td><td>'; var_dump(is_null($var)); echo '</td></tr>'; echo '</table>';

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)
8.3.60.0120.00316.50
8.3.50.0120.00721.92
8.3.40.0070.00718.97
8.3.30.0040.01119.07
8.3.20.0040.00420.21
8.3.10.0030.00623.27
8.3.00.0050.00319.56
8.2.180.0160.00616.88
8.2.170.0090.00622.96
8.2.160.0130.00320.53
8.2.150.0000.00824.18
8.2.140.0060.00324.66
8.2.130.0070.00026.16
8.2.120.0050.00319.36
8.2.110.0050.00519.45
8.2.100.0120.00417.72
8.2.90.0080.00419.21
8.2.80.0090.00017.97
8.2.70.0030.00617.50
8.2.60.0080.00017.93
8.2.50.0050.00318.10
8.2.40.0040.00418.03
8.2.30.0000.00718.20
8.2.20.0000.00817.67
8.2.10.0000.00718.03
8.2.00.0040.00417.67
8.1.280.0110.00425.92
8.1.270.0040.00423.97
8.1.260.0050.00326.35
8.1.250.0040.00428.09
8.1.240.0000.00923.98
8.1.230.0110.00017.70
8.1.220.0040.00417.74
8.1.210.0030.00618.77
8.1.200.0030.00717.23
8.1.190.0030.00517.23
8.1.180.0040.00418.10
8.1.170.0000.00818.51
8.1.160.0070.00021.96
8.1.150.0040.00418.61
8.1.140.0040.00417.43
8.1.130.0030.00317.87
8.1.120.0000.00717.49
8.1.110.0000.00717.36
8.1.100.0000.00717.30
8.1.90.0000.00717.41
8.1.80.0040.00417.33
8.1.70.0050.00217.43
8.1.60.0030.00517.57
8.1.50.0000.00817.42
8.1.40.0000.00817.43
8.1.30.0040.00417.61
8.1.20.0040.00417.62
8.1.10.0040.00417.47
8.1.00.0000.00817.47
8.0.300.0040.00418.77
8.0.290.0060.00316.88
8.0.280.0000.00718.54
8.0.270.0030.00317.30
8.0.260.0000.00617.23
8.0.250.0000.00816.92
8.0.240.0040.00717.00
8.0.230.0000.00816.98
8.0.220.0000.00716.99
8.0.210.0000.00816.84
8.0.200.0030.00316.96
8.0.190.0050.00316.97
8.0.180.0040.00416.94
8.0.170.0040.00416.94
8.0.160.0030.00317.01
8.0.150.0030.00516.79
8.0.140.0040.00416.89
8.0.130.0050.00013.41
8.0.120.0000.00716.80
8.0.110.0050.00316.92
8.0.100.0040.00416.90
8.0.90.0080.00016.79
8.0.80.0070.01416.90
8.0.70.0040.00416.75
8.0.60.0040.00416.80
8.0.50.0040.00416.93
8.0.30.0070.01317.20
8.0.20.0130.00817.40
8.0.10.0000.00717.11
8.0.00.0120.00616.87
7.4.330.0000.00615.00
7.4.320.0000.00816.49
7.4.300.0000.00716.60
7.4.290.0050.00216.44
7.4.280.0090.00016.46
7.4.270.0000.00716.57
7.4.260.0040.00416.57
7.4.250.0000.00816.41
7.4.240.0060.00116.60
7.4.230.0040.00416.69
7.4.220.0140.00616.64
7.4.210.0100.00316.37
7.4.200.0040.00316.40
7.4.160.0040.01216.53
7.4.150.0100.01017.40
7.4.140.0080.01217.86
7.4.130.0110.00716.48
7.4.120.0170.00516.52
7.4.110.0100.00716.45
7.4.100.0090.00616.57
7.4.90.0230.00016.41
7.4.80.0070.01119.39
7.4.70.0100.00716.44
7.4.60.0160.00316.39
7.4.50.0030.00616.37
7.4.40.0080.01716.48
7.4.30.0070.01416.57
7.4.00.0030.01015.07
7.3.330.0000.00613.16
7.3.320.0000.00513.04
7.3.310.0070.00016.12
7.3.300.0040.00416.28
7.3.290.0100.00616.25
7.3.280.0110.00716.31
7.3.270.0140.00717.40
7.3.260.0110.01116.31
7.3.250.0110.00716.48
7.3.240.0160.00316.41
7.3.230.0170.00316.39
7.3.210.0090.00916.38
7.3.200.0060.01419.39
7.3.190.0070.01116.20
7.3.180.0000.01716.45
7.3.170.0060.01116.37
7.3.160.0120.00516.39
7.3.120.0090.00914.98
7.3.110.0000.01114.48
7.3.100.0060.00614.66
7.3.90.0030.01315.01
7.3.80.0060.00614.58
7.3.70.0060.00914.85
7.3.60.0090.00614.46
7.3.50.0030.01314.79
7.3.40.0060.00914.85
7.3.30.0060.01014.55
7.3.20.0070.00716.37
7.3.10.0080.00416.56
7.3.00.0080.00416.76
7.2.330.0080.01216.77
7.2.320.0070.01016.78
7.2.310.0090.01316.70
7.2.300.0090.00916.58
7.2.290.0040.01316.51
7.2.240.0070.00714.87
7.2.230.0100.00614.94
7.2.220.0100.00715.14
7.2.210.0070.00714.89
7.2.200.0040.01114.96
7.2.190.0100.00314.96
7.2.180.0120.00614.91
7.2.170.0030.01215.00
7.2.160.0070.01014.88
7.2.150.0070.01016.92
7.2.140.0070.01016.77
7.2.130.0030.01316.65
7.2.120.0070.00716.78
7.2.110.0080.00816.65
7.2.100.0080.01216.86
7.2.90.0040.00916.66
7.2.80.0110.00716.86
7.2.70.0070.01316.75
7.2.60.0000.01416.75
7.2.50.0100.00716.80
7.2.40.0070.01116.93
7.2.30.0040.01017.08
7.2.20.0030.01317.05
7.2.10.0060.00616.95
7.2.00.0120.00318.11
7.1.330.0030.00715.65
7.1.320.0060.00615.67
7.1.310.0000.01615.69
7.1.300.0100.00615.54
7.1.290.0060.00915.64
7.1.280.0060.00615.90
7.1.270.0000.01715.78
7.1.260.0040.01115.60
7.1.250.0170.00015.36
7.1.100.0030.01017.94
7.1.70.0040.00416.99
7.1.60.0130.01319.70
7.1.50.0200.00316.75
7.1.00.0100.07022.33
7.0.200.0060.00616.71
7.0.140.0070.07022.00
7.0.60.0100.07720.07
7.0.50.0100.03717.96
7.0.40.0100.08320.16
7.0.30.0400.05020.12
7.0.20.0230.08320.13
7.0.10.0370.05020.33
7.0.00.0000.04320.17
5.6.280.0000.07720.93
5.6.210.0000.06720.67
5.6.200.0100.08318.13
5.6.190.0000.05020.39
5.6.180.0270.05320.74
5.6.170.0370.03720.71
5.6.160.0100.06720.49
5.6.150.0130.07018.15
5.6.140.0030.04318.14
5.6.130.0070.08718.18
5.6.120.0130.07721.00
5.6.110.0100.04721.14
5.6.100.0170.05721.15
5.6.90.0230.07721.14
5.6.80.0070.08020.42
5.6.70.4330.04020.44
5.5.350.0130.08320.43
5.5.340.0070.04017.89
5.5.330.0070.07320.15
5.5.320.0230.07720.13
5.5.310.0100.04320.41
5.5.300.0030.07718.01
5.5.290.0030.08017.91
5.5.280.0000.08320.66
5.5.270.0030.04320.66
5.5.260.0130.08020.77
5.5.250.0070.08720.60
5.5.240.0070.07720.17
5.4.450.1270.04019.10
5.4.440.0430.05719.47
5.4.430.0800.06019.46
5.4.420.0670.00019.52
5.4.410.0100.06718.90
5.4.400.0200.06018.77
5.4.390.0130.06018.59
5.4.380.0270.05318.72
5.4.370.0070.05718.72
5.4.360.0100.04018.72
5.4.350.0020.04011.99
5.4.340.0100.03211.99
5.4.320.0100.04012.48
5.4.310.0060.04812.47
5.4.300.0090.04112.47
5.4.290.0070.04012.47
5.4.280.0040.03512.37
5.4.270.0060.03612.37
5.4.260.0090.03512.37
5.4.250.0070.03812.37
5.4.240.0050.03812.37
5.4.230.0040.04212.36
5.4.220.0080.03212.36
5.4.210.0080.03712.36
5.4.200.0090.03912.36
5.4.190.0100.03412.36
5.4.180.0040.04112.36
5.4.170.0060.04212.37
5.4.160.0070.03412.36
5.4.150.0050.03612.36
5.4.140.0060.03712.04
5.4.130.0070.03412.04
5.4.120.0040.03711.99
5.4.110.0070.03411.99
5.4.100.0050.03611.98
5.4.90.0070.03511.99
5.4.80.0030.03911.98
5.4.70.0050.03511.98
5.4.60.0040.03611.98
5.4.50.0050.03611.98
5.4.40.0080.03111.97
5.4.30.0080.03211.96
5.4.20.0080.03211.96
5.4.10.0080.03711.97
5.4.00.0070.03811.45
5.3.290.0080.04812.80
5.3.280.0100.03812.71
5.3.270.0060.03912.73
5.3.260.0040.03912.72
5.3.250.0080.03512.72
5.3.240.0060.03712.72
5.3.230.0070.03712.71
5.3.220.0070.03612.68
5.3.210.0080.03812.68
5.3.200.0050.03912.68
5.3.190.0070.03612.68
5.3.180.0110.03812.67
5.3.170.0110.03212.67
5.3.160.0100.04312.67
5.3.150.0100.03912.67
5.3.140.0100.03812.66
5.3.130.0050.04012.66
5.3.120.0060.04312.65
5.3.110.0100.03812.66
5.3.100.0070.03612.12
5.3.90.0090.03512.08
5.3.80.0050.03712.07
5.3.70.0060.03912.07
5.3.60.0070.03612.07
5.3.50.0030.03912.01
5.3.40.0050.03612.01
5.3.30.0060.03411.96
5.3.20.0070.03411.74
5.3.10.0090.03511.71
5.3.00.0060.04011.70
5.2.170.0070.0319.21
5.2.160.0050.0299.21
5.2.150.0010.0339.21
5.2.140.0030.0349.21
5.2.130.0080.0339.17
5.2.120.0000.0359.16
5.2.110.0080.0349.17
5.2.100.0040.0329.16
5.2.90.0050.0299.16
5.2.80.0050.0299.16
5.2.70.0050.0349.15
5.2.60.0010.0329.12
5.2.50.0040.0299.08
5.2.40.0050.0299.05
5.2.30.0020.0329.03
5.2.20.0090.0309.02
5.2.10.0050.0288.95
5.2.00.0030.0308.80
5.1.60.0060.0248.09
5.1.50.0030.0268.09
5.1.40.0050.0238.07
5.1.30.0040.0268.41
5.1.20.0050.0268.44
5.1.10.0070.0258.17
5.1.00.0040.0258.16
5.0.50.0010.0226.64
5.0.40.0080.0146.50
5.0.30.0020.0326.32
5.0.20.0030.0226.29
5.0.10.0080.0226.27
5.0.00.0040.0296.27
4.4.90.0010.0184.78
4.4.80.0030.0224.76
4.4.70.0040.0194.75
4.4.60.0040.0184.75
4.4.50.0020.0164.77
4.4.40.0030.0294.70
4.4.30.0020.0214.76
4.4.20.0020.0164.84
4.4.10.0020.0164.85
4.4.00.0020.0254.76
4.3.110.0040.0194.67
4.3.100.0010.0174.67
4.3.90.0060.0114.63
4.3.80.0070.0274.58
4.3.70.0030.0134.63
4.3.60.0030.0134.63
4.3.50.0010.0174.63
4.3.40.0030.0244.54
4.3.30.0020.0163.32
4.3.20.0020.0163.30
4.3.10.0030.0153.26
4.3.00.0230.0307.71

preferences:
39.59 ms | 401 KiB | 5 Q