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run code in 300+ PHP versions simultaneously
<?php declare(strict_types=1); var_dump(PrimePalindromeFinder::find(1000, 1)); var_dump(PrimePalindromeFinder::find(10, 1)); var_dump(PrimePalindromeFinder::find(500, 400)); var_dump(PrimePalindromeFinder::findStrict(1000, 1)); var_dump(PrimePalindromeFinder::findStrict(10, 1)); try { var_dump(PrimePalindromeFinder::findStrict(500, 400)); } catch(\Exception $e) { var_dump($e->getMessage()); } class PrimePalindromeFinder { public static function find(int $start, int $end) { for($i = $start; $i >= $end; $i--) { if(self::isPalindrome($i) && self::isPrime($i)) { return $i; } } return false; } public static function findStrict(int $start, int $end):int { for($i = $start; $i >= $end; $i--) { if(self::isPalindrome($i) && self::isPrime($i)) { return $i; } } throw new \Exception("No Prime Palindrome found between {$start} and {$end}"); } private static function isPalindrome(int $number):bool { $number = strval($number); for($i = 1; $i <= floor(strlen($number) / 2); $i++) { $from_start = substr($number, $i - 1, 1); $from_end = substr($number, $i * -1, 1); if($from_start !== $from_end) { return false; } } return true; } private static function isPrime(int $number):bool { if($number == 1) { return false; } if($number == 2) { return true; } if($number % 2 == 0) { return false; } for($i = 3; $i <= ceil(sqrt($number)); $i = $i + 2) { if($number % $i == 0) return false; } return true; } }

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)
8.3.60.0170.00016.88
8.3.50.0130.00622.10
8.3.40.0110.00418.78
8.3.30.0130.00318.97
8.3.20.0050.00320.29
8.3.10.0040.00423.64
8.3.00.0040.00419.38
8.2.180.0090.01318.48
8.2.170.0110.00422.96
8.2.160.0030.01020.52
8.2.150.0040.00424.18
8.2.140.0040.00424.66
8.2.130.0100.00317.63
8.2.120.0040.00426.35
8.2.110.0030.00620.59
8.2.100.0120.00018.15
8.2.90.0050.00319.22
8.2.80.0050.00317.97
8.2.70.0000.01217.88
8.2.60.0040.00418.16
8.2.50.0000.00818.07
8.2.40.0050.00619.30
8.2.30.0000.00820.76
8.2.20.0030.00517.84
8.2.10.0040.00418.23
8.2.00.0000.00718.20
8.1.280.0060.00925.92
8.1.270.0040.00422.24
8.1.260.0090.00028.09
8.1.250.0000.00828.09
8.1.240.0090.00022.59
8.1.230.0040.00817.66
8.1.220.0040.00417.91
8.1.210.0050.00318.77
8.1.200.0030.00717.48
8.1.190.0000.00817.35
8.1.180.0040.00418.10
8.1.170.0000.00918.63
8.1.160.0000.00822.16
8.1.150.0040.00420.77
8.1.140.0030.00619.62
8.1.130.0000.00717.90
8.1.120.0000.00717.61
8.1.110.0040.00417.57
8.1.100.0040.00417.45
8.1.90.0000.00817.55
8.1.80.0000.00917.57
8.1.70.0000.00717.55
8.1.60.0000.01017.68
8.1.50.0040.00417.61
8.1.40.0000.00717.59
8.1.30.0000.01017.59
8.1.20.0040.00417.59
8.1.10.0030.00617.62
8.1.00.0000.00817.61
8.0.300.0020.00518.77
8.0.290.0040.00416.75
8.0.280.0000.00818.54
8.0.270.0070.00017.47
8.0.260.0040.00417.37
8.0.250.0050.00317.10
8.0.240.0030.00317.05
8.0.230.0020.00517.14
8.0.220.0000.00717.02
8.0.210.0000.00717.05
8.0.200.0070.00016.98
8.0.190.0040.00416.98
8.0.180.0000.00717.13
8.0.170.0030.00517.11
8.0.160.0040.00417.15
8.0.150.0050.00217.01
8.0.140.0060.00317.02
8.0.130.0080.00013.52
8.0.120.0090.00017.00
8.0.110.0030.00616.95
8.0.100.0050.00217.05
8.0.90.0020.00516.94
8.0.80.0120.00417.12
8.0.70.0040.00417.05
8.0.60.0050.00317.17
8.0.50.0040.00417.04
8.0.30.0120.00517.11
8.0.20.0060.01317.40
8.0.10.0000.00717.05
8.0.00.0110.00816.83
7.4.330.0050.00015.20
7.4.320.0000.00616.62
7.4.300.0000.00616.59
7.4.290.0040.00416.50
7.4.280.0070.00016.71
7.4.270.0030.00616.55
7.4.260.0110.00016.52
7.4.250.0030.00616.56
7.4.240.0020.00616.58
7.4.230.0000.00716.41
7.4.220.0090.00916.57
7.4.210.0070.00816.69
7.4.200.0040.00416.64
7.4.160.0070.01016.38
7.4.150.0070.01117.40
7.4.140.0120.01117.86
7.4.130.0150.00616.67
7.4.120.0110.00916.65
7.4.110.0030.01416.63
7.4.100.0130.00516.63
7.4.90.0090.00916.60
7.4.80.0180.00619.39
7.4.70.0030.01316.62
7.4.60.0070.01416.64
7.4.50.0050.00316.37
7.4.40.0150.00716.86
7.4.30.0120.00916.82
7.4.00.0000.01715.08
7.3.330.0000.00513.52
7.3.320.0050.00013.29
7.3.310.0000.00716.49
7.3.300.0000.00716.41
7.3.290.0030.00316.46
7.3.280.0070.00916.47
7.3.270.0110.00917.40
7.3.260.0170.00816.49
7.3.250.0100.00816.59
7.3.240.0120.00516.43
7.3.230.0060.01216.67
7.3.210.0090.01216.70
7.3.200.0100.00716.68
7.3.190.0130.00316.61
7.3.180.0060.01316.41
7.3.170.0070.01016.57
7.3.160.0140.00316.71
7.2.330.0030.01916.69
7.2.320.0210.00316.88
7.2.310.0070.01016.82
7.2.300.0090.00816.75
7.2.290.0140.00716.79
7.2.60.0070.00716.91
7.2.00.0070.00719.47
7.1.200.0000.01415.79
7.1.100.0060.00618.34
7.1.70.0030.00617.16
7.1.60.0080.01119.48
7.1.50.0070.01716.89
7.1.00.0000.08022.28
7.0.200.0390.00414.72
7.0.60.0000.05320.08
7.0.50.0070.04317.94
7.0.40.0100.04720.21
7.0.30.0130.05720.21
7.0.20.0400.07020.16
7.0.10.0100.06720.07
7.0.00.0130.07720.25
5.6.280.0070.03320.92
5.6.210.0000.04320.71
5.6.200.0070.06318.17
5.6.190.0100.08020.49
5.6.180.0300.06720.39
5.6.170.0270.05020.57
5.6.160.0070.07720.52
5.6.150.0100.08018.19
5.6.140.0030.05318.27
5.6.130.0070.08318.24
5.6.120.0070.07721.15
5.6.110.0000.07021.13
5.6.100.0100.08021.11
5.6.90.0030.04321.11
5.6.80.0070.07320.39
5.5.350.4100.04020.43
5.5.340.0030.07318.00
5.5.330.0130.08020.55
5.5.320.0270.04020.35
5.5.310.0370.05720.30
5.5.300.0200.07317.95
5.5.290.0070.05318.07
5.5.280.0070.05720.82
5.5.270.0100.03720.88
5.5.260.0000.05320.88
5.5.250.0000.08720.73
5.5.240.0100.03320.08

preferences:
81.43 ms | 401 KiB | 5 Q