3v4l.org

run code in 300+ PHP versions simultaneously
<?php $replacement = "1"; $final = substr($string, 0, 1).$replacement; echo $final;

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)
8.3.60.0060.01216.50
8.3.50.0090.00616.58
8.3.40.0120.00618.60
8.3.30.0090.00918.67
8.3.20.0070.00020.16
8.3.10.0080.00023.61
8.3.00.0080.00023.56
8.2.180.0040.01225.92
8.2.170.0070.00722.96
8.2.160.0100.00619.34
8.2.150.0000.00824.18
8.2.140.0030.00524.66
8.2.130.0070.00026.16
8.2.120.0040.00419.26
8.2.110.0060.00319.33
8.2.100.0060.00618.16
8.2.90.0080.00019.05
8.2.80.0050.00317.97
8.2.70.0000.00817.49
8.2.60.0000.00817.91
8.2.50.0080.00018.22
8.2.40.0070.00020.55
8.2.30.0000.00820.91
8.2.20.0000.00818.04
8.2.10.0040.00418.03
8.2.00.0020.00518.04
8.1.280.0100.00725.92
8.1.270.0040.00422.24
8.1.260.0060.00326.35
8.1.250.0000.00828.09
8.1.240.0030.00622.74
8.1.230.0080.00320.29
8.1.220.0040.00417.74
8.1.210.0040.00418.77
8.1.200.0060.00317.23
8.1.190.0090.00017.23
8.1.180.0040.00418.10
8.1.170.0040.00418.59
8.1.160.0000.00718.84
8.1.150.0000.00720.04
8.1.140.0000.00718.98
8.1.130.0070.00218.98
8.1.120.0000.00717.42
8.1.110.0000.00817.35
8.1.100.0030.00517.34
8.1.90.0080.00017.33
8.1.80.0040.00417.49
8.1.70.0030.00317.38
8.1.60.0040.00417.57
8.1.50.0050.00317.39
8.1.40.0040.00417.41
8.1.30.0000.00817.57
8.1.20.0030.00617.67
8.1.10.0030.00617.56
8.1.00.0040.00417.48
8.0.300.0040.00418.94
8.0.290.0080.00016.75
8.0.280.0070.00018.43
8.0.270.0070.00017.25
8.0.260.0030.00318.91
8.0.250.0030.00316.97
8.0.240.0040.00416.94
8.0.230.0030.00516.91
8.0.220.0030.00516.93
8.0.210.0000.00616.90
8.0.200.0030.00316.94
8.0.190.0090.00017.03
8.0.180.0000.00716.90
8.0.170.0040.00416.87
8.0.160.0000.00716.91
8.0.150.0040.00416.77
8.0.140.0000.00916.96
8.0.130.0050.00013.45
8.0.120.0000.00816.79
8.0.110.0040.00416.92
8.0.100.0000.00716.90
8.0.90.0020.00516.98
8.0.80.0040.01116.91
8.0.70.0050.00216.81
8.0.60.0000.00816.97
8.0.50.0020.00516.74
8.0.30.0100.00617.03
8.0.20.0080.01017.40
8.0.10.0000.00816.80
8.0.00.0140.00316.54
7.4.330.0050.00015.55
7.4.320.0000.00716.49
7.4.300.0000.00616.56
7.4.290.0000.00916.53
7.4.280.0030.00616.58
7.4.270.0030.00316.59
7.4.260.0030.00616.56
7.4.250.0070.00016.54
7.4.240.0000.00716.46
7.4.230.0050.00216.64
7.4.220.0070.01016.46
7.4.210.0100.00616.52
7.4.200.0030.00316.52
7.4.160.0060.00916.72
7.4.150.0060.01217.40
7.4.140.0090.00917.86
7.4.130.0090.00916.44
7.4.120.0110.01116.50
7.4.110.0100.01316.52
7.4.100.0080.00916.41
7.4.90.0150.00316.59
7.4.80.0140.00319.39
7.4.70.0120.00916.48
7.4.60.0060.00916.31
7.4.50.0030.01016.51
7.4.40.0070.01516.41
7.4.30.0110.00516.28
7.4.00.0060.00915.00
7.3.330.0050.00013.13
7.3.320.0000.00613.01
7.3.310.0040.00416.34
7.3.300.0030.00316.15
7.3.290.0000.00716.17
7.3.280.0090.00716.29
7.3.270.0120.00917.40
7.3.260.0080.01216.30
7.3.250.0120.00716.33
7.3.240.0120.00616.29
7.3.230.0130.00316.23
7.3.210.0100.00716.59
7.3.200.0070.01016.36
7.3.190.0120.00916.48
7.3.180.0080.00816.54
7.3.170.0120.00316.33
7.3.160.0060.00916.28
7.3.120.0090.00914.78
7.3.110.0060.01214.73
7.3.100.0090.00914.82
7.3.90.0090.00914.86
7.3.80.0030.01014.82
7.3.70.0070.00714.70
7.3.60.0070.00714.41
7.3.50.0040.00814.73
7.3.40.0060.00314.62
7.3.30.0060.00614.85
7.3.20.0120.00316.70
7.3.10.0000.01416.62
7.3.00.0080.00816.55
7.2.330.0060.01216.70
7.2.320.0070.01016.61
7.2.310.0100.00816.63
7.2.300.0140.00616.37
7.2.290.0080.00816.39
7.2.250.0070.01114.76
7.2.240.0100.01015.16
7.2.230.0110.00814.97
7.2.220.0060.00814.72
7.2.210.0120.00314.99
7.2.200.0080.00314.70
7.2.190.0060.01014.97
7.2.180.0060.00914.87
7.2.170.0080.00414.94
7.2.110.0110.00316.68
7.2.60.0130.00516.62
7.2.50.0060.00916.71
7.1.330.0060.00615.93
7.1.320.0030.00615.82
7.1.310.0000.01616.05
7.1.300.0030.00615.91
7.1.290.0050.00515.62
7.1.280.0060.00615.78
7.1.270.0000.00815.80
7.1.260.0000.01015.86
7.1.200.0120.00315.61
7.1.110.0910.01015.83
7.1.100.0710.01516.43
7.1.90.2210.01616.22
7.1.80.0510.00616.00
7.1.70.0750.01015.04
7.1.60.1050.00433.08
7.1.50.1020.01833.09
7.1.40.1010.01032.45
7.1.30.1240.00332.62
7.1.20.1130.01932.80
7.1.10.0780.01914.56
7.1.00.0760.01314.57
7.0.250.0630.00915.51
7.0.240.0810.01315.71
7.0.230.0710.01615.88
7.0.220.0670.01415.84
7.0.210.0660.01414.69
7.0.200.0970.01614.64
7.0.190.1000.01014.74
7.0.180.0500.01414.27
7.0.170.1160.01014.38
7.0.160.1190.01914.35
7.0.150.0500.01314.24
7.0.140.0760.01714.45
7.0.130.0880.01314.53
7.0.120.0870.01314.74
7.0.110.0560.01314.43
7.0.100.0590.00314.40
7.0.90.0660.01014.43
7.0.80.1220.01314.61
7.0.70.0800.00714.67
7.0.60.0820.01014.14
7.0.50.0630.01014.48
7.0.40.0570.01314.73
7.0.30.0520.01014.70
7.0.20.0610.01814.53
7.0.10.0590.00914.58
7.0.00.0740.01014.82

preferences:
55.05 ms | 401 KiB | 5 Q