3v4l.org

run code in 300+ PHP versions simultaneously
<?php function longest_palendrome($string) { $current = $longest = ''; foreach (str_split(strrev($string)) as $char) { if (strstr($current . $char, $string)) { $current .= $char; } elseif (!empty($current) && strlen($current) > strlen($longest)) { $longest = $current; $current = ''; } } return $longest; } echo longest_palendrome("i ama racecar");

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)
8.3.70.0070.00716.50
8.3.60.0120.00318.38
8.3.50.0100.00816.44
8.3.40.0110.00718.59
8.3.30.0140.00018.90
8.3.20.0030.00618.69
8.3.10.0000.00818.66
8.3.00.0030.00519.25
8.2.180.0070.01416.38
8.2.170.0170.00322.96
8.2.160.0070.01018.83
8.2.150.0040.00424.18
8.2.140.0030.00524.66
8.2.130.0000.00826.16
8.2.120.0070.00019.66
8.2.110.0030.00622.19
8.2.100.0060.00617.78
8.2.90.0030.00517.84
8.2.80.0050.00219.32
8.2.70.0060.00317.50
8.2.60.0050.00318.03
8.2.50.0050.00318.04
8.2.40.0080.00019.23
8.2.30.0040.00417.73
8.2.20.0000.00817.63
8.2.10.0000.00717.77
8.2.00.0040.00417.59
8.1.280.0070.00725.92
8.1.270.0080.00023.99
8.1.260.0070.00026.35
8.1.250.0050.00328.09
8.1.240.0050.00322.11
8.1.230.0110.00021.03
8.1.220.0070.00017.76
8.1.210.0040.00418.77
8.1.200.0030.00617.35
8.1.190.0030.00617.23
8.1.180.0050.00519.01
8.1.170.0040.00417.62
8.1.160.0040.00418.96
8.1.150.0000.00718.73
8.1.140.0040.00417.49
8.1.130.0030.00317.44
8.1.120.0080.00017.50
8.1.110.0030.00317.38
8.1.100.0040.00417.33
8.1.90.0030.00317.42
8.1.80.0000.00717.43
8.1.70.0050.00217.34
8.1.60.0080.00017.55
8.1.50.0030.00517.46
8.1.40.0060.00317.52
8.1.30.0060.00317.69
8.1.20.0090.00317.52
8.1.10.0000.00717.48
8.1.00.0050.00217.40
8.0.300.0040.00420.08
8.0.290.0070.00016.75
8.0.280.0040.00418.49
8.0.270.0030.00317.30
8.0.260.0070.00016.72
8.0.250.0070.00216.82
8.0.240.0000.01016.91
8.0.230.0070.00016.90
8.0.220.0070.00016.84
8.0.210.0060.00016.83
8.0.200.0060.00016.93
8.0.190.0070.00016.83
8.0.180.0000.00716.91
8.0.170.0070.00016.79
8.0.160.0040.00416.98
8.0.150.0040.00416.77
8.0.140.0000.00816.80
8.0.130.0030.00313.29
8.0.120.0000.00816.77
8.0.110.0070.00016.84
8.0.100.0070.00016.77
8.0.90.0040.00416.79
8.0.80.0070.00716.80
8.0.70.0030.00516.97
8.0.60.0000.00816.66
8.0.50.0080.00016.83
8.0.30.0090.00917.35
8.0.20.0110.00817.14
8.0.10.0000.00717.09
8.0.00.0050.01216.72
7.4.330.0000.00512.93
7.4.320.0030.00316.68
7.4.300.0000.00716.57
7.4.290.0030.01016.50
7.4.280.0050.00316.45
7.4.270.0000.00716.57
7.4.260.0060.00013.38
7.4.250.0030.00616.55
7.4.240.0070.00016.51
7.4.230.0030.00316.46
7.4.220.0050.01416.54
7.4.210.0130.00316.68
7.4.200.0030.00316.47
7.4.190.0080.00016.40
7.4.160.0000.01716.68
7.4.150.0110.00716.63
7.4.140.0130.00617.86
7.4.130.0150.00316.50
7.4.120.0110.00716.45
7.4.110.0100.01316.55
7.4.100.0070.01016.55
7.4.90.0180.00616.54
7.4.80.0080.01619.39
7.4.70.0090.00916.50
7.4.60.0120.00316.59
7.4.50.0000.00516.61
7.4.40.0100.00316.57
7.4.30.0110.00716.46
7.4.10.0070.01015.20
7.4.00.0030.01214.85
7.3.330.0000.00613.13
7.3.320.0000.00613.12
7.3.310.0030.00316.19
7.3.300.0000.00616.25
7.3.290.0090.00516.23
7.3.280.0030.01316.31
7.3.270.0060.00916.38
7.3.260.0030.02016.39
7.3.240.0070.01116.31
7.3.230.0150.00616.31
7.3.210.0080.00816.33
7.3.200.0130.00316.34
7.3.190.0140.00316.42
7.3.180.0060.00916.40
7.3.170.0040.01616.28
7.3.160.0030.01616.42
7.3.130.0110.00714.96
7.3.120.0080.00814.55
7.3.110.0040.01114.62
7.3.100.0070.01015.05
7.3.90.0090.00014.84
7.3.80.0040.01115.02
7.3.70.0040.00714.71
7.3.60.0070.00714.69
7.3.50.0060.00314.80
7.3.40.0080.00814.82
7.3.30.0030.00914.46
7.3.20.0070.00316.32
7.3.10.0000.01316.56
7.3.00.0100.01016.61
7.2.330.0100.00716.79
7.2.320.0070.01016.39
7.2.310.0070.01116.68
7.2.300.0080.00816.79
7.2.290.0030.01416.84
7.2.260.0100.01015.18
7.2.250.0040.01415.05
7.2.240.0030.01215.15
7.2.230.0040.01115.23
7.2.220.0090.00614.95
7.2.210.0000.01415.28
7.2.200.0090.00615.24
7.2.190.0000.01415.08
7.2.180.0040.01115.05
7.2.170.0110.00414.91
7.2.160.0070.00715.19
7.2.150.0070.01017.04
7.2.140.0090.00916.89
7.2.130.0000.01416.93
7.2.120.0060.00616.98
7.2.110.0080.00817.02
7.2.100.0070.01016.82
7.2.90.0050.00716.80
7.2.80.0000.01316.86
7.2.70.0060.00916.88
7.2.60.0040.01217.09
7.2.50.0030.01017.00
7.2.40.0080.00816.98
7.2.30.0030.01216.88
7.2.20.0080.00317.00
7.2.10.0120.00316.86
7.2.00.0030.00918.27
7.1.330.0140.00015.71
7.1.320.0100.01015.91
7.1.310.0030.01315.73
7.1.300.0030.01015.75
7.1.290.0080.00615.79
7.1.280.0030.00915.75
7.1.270.0040.01115.93
7.1.260.0030.01215.73
7.1.250.0060.00615.63
7.1.240.0070.00715.62
7.1.230.0060.00915.74
7.1.220.0030.01315.75
7.1.210.0120.00015.84
7.1.200.0100.00315.89
7.1.190.0060.00315.77
7.1.180.0110.00415.75
7.1.170.0120.00315.95
7.1.160.0000.01215.91
7.1.150.0060.00915.76
7.1.140.0040.01215.82
7.1.130.0040.00715.73
7.1.120.0070.01015.88
7.1.110.0090.00015.75
7.1.100.0060.00617.08
7.1.90.0070.00715.64
7.1.80.0030.01015.76
7.1.70.0050.00816.19
7.1.60.0030.01417.51
7.1.50.0030.00716.21
7.1.40.0100.00315.89
7.1.30.0030.00715.83
7.1.20.0000.01415.52
7.1.10.0060.00615.82
7.1.00.0040.02718.95
7.0.330.0000.01515.36
7.0.320.0070.00715.61
7.0.310.0080.00415.38
7.0.300.0090.00315.30
7.0.290.0040.01115.24
7.0.280.0100.00315.64
7.0.270.0040.01115.53
7.0.260.0060.00615.39
7.0.250.0070.00415.35
7.0.240.0040.00715.50
7.0.230.0090.00315.38
7.0.220.0030.01015.10
7.0.210.0130.00015.55
7.0.200.0020.00815.96
7.0.190.0040.01115.28
7.0.180.0070.00715.63
7.0.170.0050.00515.38
7.0.160.0040.01115.38
7.0.150.0000.01015.56
7.0.140.0070.03518.70
7.0.130.0080.00415.38
7.0.120.0020.04218.88
7.0.110.0000.01515.37
7.0.100.0040.01115.46
7.0.90.0030.00615.45
7.0.80.0060.00615.33
7.0.70.0090.00615.29
7.0.60.0070.02917.56
7.0.50.0030.02516.65
7.0.40.0060.02015.57
7.0.30.0020.04415.67
7.0.20.0070.03315.64
7.0.10.0070.03715.64
7.0.00.0100.04215.57
5.6.400.0170.00013.98
5.6.390.0150.00014.54
5.6.380.0090.00614.32
5.6.370.0030.01014.45
5.6.360.0060.00614.65
5.6.350.0040.00714.63
5.6.340.0030.01114.25
5.6.330.0030.00614.67
5.6.320.0080.00414.22
5.6.310.0080.00414.25
5.6.300.0000.01314.48
5.6.290.0080.00614.65
5.6.280.0070.03717.73
5.6.270.0000.01714.11
5.6.260.0070.00714.05
5.6.250.0030.01314.45
5.6.240.0070.00714.45
5.6.230.0060.00614.41
5.6.220.0040.01214.17
5.6.210.0070.04817.52
5.6.200.0050.02316.27
5.6.190.0020.03216.34
5.6.180.0050.03916.34
5.6.170.0080.03516.38
5.6.160.0070.04516.27
5.6.150.0050.05016.28
5.6.140.0030.04616.15
5.6.130.0080.04316.39
5.6.120.0100.04016.19
5.6.110.0080.04116.21
5.6.100.0020.04816.42
5.6.90.0070.04216.39
5.6.80.0090.01915.83
5.6.70.0100.03815.89
5.6.60.0090.03815.89
5.6.50.0090.03715.89
5.6.40.0080.04516.01
5.6.30.0060.04415.95
5.6.20.0070.02815.95
5.6.10.0030.04715.77
5.6.00.0050.04415.89
5.5.380.0080.00614.18
5.5.370.0030.01014.24
5.5.360.0100.00714.31
5.5.350.0150.04517.35
5.5.340.0000.02815.97
5.5.330.0040.02416.07
5.5.320.0020.03916.10
5.5.310.0070.03816.14
5.5.300.0090.04016.00
5.5.290.0100.03816.29
5.5.280.0030.05016.09
5.5.270.0050.04316.18
5.5.260.0030.02816.08
5.5.250.0050.03816.08
5.5.240.0060.03815.72
5.5.230.0070.04315.86
5.5.220.0030.02915.74
5.5.210.0080.04015.85
5.5.200.0060.03815.70
5.5.190.0100.03815.73
5.5.180.0050.04015.64
5.5.170.0120.00314.06
5.5.160.0050.04615.80
5.5.150.0040.03415.53
5.5.140.0050.04015.80
5.5.130.0090.04015.72
5.5.120.0030.04015.84
5.5.110.0060.04115.78
5.5.100.0040.04215.86
5.5.90.0090.03715.75
5.5.80.0070.02115.72
5.5.70.0110.02415.77
5.5.60.0050.04415.81
5.5.50.0080.04115.81
5.5.40.0100.03215.49
5.5.30.0080.02215.69
5.5.20.0050.04315.73
5.5.10.0070.03715.73
5.5.00.0040.04015.55
5.4.450.0080.04315.65
5.4.440.0050.04215.78
5.4.430.0020.02515.70
5.4.420.0050.04315.79
5.4.410.0030.03915.51
5.4.400.0090.01515.51
5.4.390.0020.04215.49
5.4.380.0030.03315.53
5.4.370.0020.04315.49
5.4.360.0080.04015.61
5.4.350.0050.03815.50
5.4.340.0050.04515.50
5.4.330.0000.00711.96
5.4.320.0080.03815.48
5.4.310.0030.03115.46
5.4.300.0070.02715.50
5.4.290.0050.04015.50
5.4.280.0050.02915.48
5.4.270.0050.04215.62
5.4.260.0070.04015.47
5.4.250.0020.04015.52
5.4.240.0100.01615.53
5.4.230.0040.04015.53
5.4.220.0080.03615.54
5.4.210.0000.03215.54
5.4.200.0080.02715.45
5.4.190.0050.02715.50
5.4.180.0110.03115.50
5.4.170.0020.04615.52
5.4.160.0060.04215.48
5.4.150.0050.02815.49
5.4.140.0070.03714.13
5.4.130.0100.03014.12
5.4.120.0090.03314.18
5.4.110.0070.01914.21
5.4.100.0030.02114.20
5.4.90.0000.02714.22
5.4.80.0060.02114.12
5.4.70.0040.02014.17
5.4.60.0060.01814.16
5.4.50.0070.01514.14
5.4.40.0000.02114.17
5.4.30.0050.01714.26
5.4.20.0030.02214.25
5.4.10.0000.03514.18
5.4.00.0030.02413.87
5.3.290.0030.02813.33
5.3.280.0050.03913.29
5.3.270.0000.04513.28
5.3.260.0090.03813.29
5.3.250.0060.03713.31
5.3.240.0050.03913.30
5.3.230.0030.04313.20
5.3.220.0050.02713.27
5.3.210.0030.02213.26
5.3.200.0020.02313.28
5.3.190.0090.01713.19
5.3.180.0050.01913.27
5.3.170.0090.02013.28
5.3.160.0020.02013.29
5.3.150.0020.02313.27
5.3.140.0020.02213.27
5.3.130.0050.02013.25
5.3.120.0080.01613.27
5.3.110.0030.02013.27
5.3.100.0030.02112.98
5.3.90.0030.02213.09
5.3.80.0020.02012.99
5.3.70.0050.02013.00
5.3.60.0030.02012.99
5.3.50.0050.02013.00
5.3.40.0040.02112.94
5.3.30.0020.02312.97
5.3.20.0050.02012.78
5.3.10.0040.02212.82
5.3.00.0030.01912.74
5.2.170.0000.03011.04
5.2.160.0030.02711.11
5.2.150.0000.03011.21
5.2.140.0030.03011.19
5.2.130.0000.03011.15
5.2.120.0070.02311.20
5.2.110.0000.03011.15
5.2.100.0030.02711.13
5.2.90.0030.02711.14
5.2.80.0000.03011.07
5.2.70.0030.02711.05
5.2.60.0000.03010.96
5.2.50.0030.02711.04
5.2.40.0000.03011.03
5.2.30.0030.02711.00
5.2.20.0030.02710.94
5.2.10.0000.03010.86
5.2.00.0070.03310.77
5.1.60.0000.04010.00
5.1.50.0100.05310.09
5.1.40.0030.0509.96
5.1.30.0000.04710.36
5.1.20.0030.04010.40
5.1.10.0070.05310.04
5.1.00.0070.05010.06
5.0.50.0000.0438.49
5.0.40.0000.0308.40
5.0.30.0000.0638.29
5.0.20.0000.0338.11
5.0.10.0070.0378.21
5.0.00.0000.0638.14
4.4.90.0030.0107.81
4.4.80.0000.0177.81
4.4.70.0070.0107.81
4.4.60.0030.0107.81
4.4.50.0000.0177.81
4.4.40.0030.0437.81
4.4.30.0070.0337.81
4.4.20.0030.0337.81
4.4.10.0130.0237.81
4.4.00.0000.0407.81
4.3.110.0030.0277.81
4.3.100.0030.0377.81
4.3.90.0000.0377.81
4.3.80.0030.0537.81
4.3.70.0070.0177.81
4.3.60.0030.0207.81
4.3.50.0100.0137.81
4.3.40.0070.0477.81
4.3.30.0000.0207.81
4.3.20.0000.0377.81
4.3.10.0030.0277.81
4.3.00.0030.0307.81

preferences:
121.62 ms | 401 KiB | 5 Q