3v4l.org

run code in 300+ PHP versions simultaneously
<?php /** * Checks whether a string is valid json. * * @param string $string * @return boolean */ function json_is($string) { try { // try to decode string json_decode($string); } catch (ErrorException $e) { // exception has been caught which means argument wasn't a string and thus is definitely no json. return FALSE; } // check if error occured return (json_last_error() == JSON_ERROR_NONE); } // Make sure the string is not empty and is, in fact, a string. An empty string is not valid JSON. function isJson($string, $assoc = false) { if(!empty($string) && is_string($string)) { json_decode($string, $assoc); return (json_last_error() == JSON_ERROR_NONE); // return json_decode($str) != null; } return false; } $a=['arraiii'=>['dentro'=>234]]; $b=json_encode($a); $c=''; var_dump(isJson($c));

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)
8.3.40.0150.00018.66
8.3.30.0030.01020.39
8.3.20.0080.00020.33
8.3.10.0050.00322.04
8.3.00.0070.00022.31
8.2.170.0140.00722.96
8.2.160.0030.01322.11
8.2.150.0080.00024.18
8.2.140.0050.00324.66
8.2.130.0000.00726.16
8.2.120.0080.00020.75
8.2.110.0030.00619.40
8.2.100.0070.00417.78
8.2.90.0000.00819.08
8.2.80.0000.00919.29
8.2.70.0030.00517.50
8.2.60.0050.00217.80
8.2.50.0040.00418.07
8.2.40.0040.00417.91
8.2.30.0000.00719.52
8.2.20.0040.00417.55
8.2.10.0000.00817.82
8.2.00.0030.00517.77
8.1.270.0090.00023.99
8.1.260.0040.00426.35
8.1.250.0040.00428.09
8.1.240.0070.00422.38
8.1.230.0030.00721.09
8.1.220.0000.00818.77
8.1.210.0030.00718.79
8.1.200.0070.00317.25
8.1.190.0030.00617.53
8.1.180.0060.00318.10
8.1.170.0040.00418.61
8.1.160.0000.00820.63
8.1.150.0000.00718.69
8.1.140.0000.00717.45
8.1.130.0000.00717.88
8.1.120.0000.00717.38
8.1.110.0040.00417.42
8.1.100.0040.00417.52
8.1.90.0030.00317.54
8.1.80.0070.00017.50
8.1.70.0040.00417.39
8.1.60.0030.00617.56
8.1.50.0000.00717.50
8.1.40.0040.00417.43
8.1.30.0000.00717.53
8.1.20.0030.00517.68
8.1.10.0050.00317.45
8.1.00.0000.01017.38
8.0.300.0020.00520.02
8.0.290.0000.00717.18
8.0.280.0040.00418.45
8.0.270.0050.00217.26
8.0.260.0030.00316.88
8.0.250.0040.00416.98
8.0.240.0030.00716.96
8.0.230.0030.00317.00
8.0.220.0060.00316.93
8.0.210.0030.00316.88
8.0.200.0030.00316.97
8.0.190.0000.00816.93
8.0.180.0050.00316.90
8.0.170.0000.00816.91
8.0.160.0080.00016.80
8.0.150.0100.00016.92
8.0.140.0070.00016.90
8.0.130.0030.00313.33
8.0.120.0040.00416.77
8.0.110.0080.00016.84
8.0.100.0040.00416.89
8.0.90.0030.00616.97
8.0.80.0100.00616.85
8.0.70.0040.00416.75
8.0.60.0000.00716.97
8.0.50.0000.00816.85
8.0.30.0090.00917.00
8.0.20.0130.00617.40
8.0.10.0070.00016.82
8.0.00.0080.01016.65
7.4.330.0000.00515.00
7.4.320.0040.00416.50
7.4.300.0030.00316.49
7.4.290.0030.00316.56
7.4.280.0070.00016.64
7.4.270.0050.00316.52
7.4.260.0000.00613.25
7.4.250.0040.00416.54
7.4.240.0000.00716.57
7.4.230.0000.00716.34
7.4.220.0130.00616.52
7.4.210.0080.00916.60
7.4.200.0000.00716.64
7.4.190.0030.00316.75
7.4.160.0100.00716.69
7.4.150.0150.00317.40
7.4.140.0110.00717.86
7.4.130.0060.01116.43
7.4.120.0090.00916.44
7.4.110.0140.00316.55
7.4.100.0110.00616.51
7.4.90.0100.00616.42
7.4.80.0150.00619.39
7.4.70.0070.01516.66
7.4.60.0130.00316.53
7.4.50.0050.00316.30
7.4.40.0070.01022.77
7.4.30.0110.01116.64
7.4.00.0030.01015.05
7.3.330.0050.00013.19
7.3.320.0050.00013.05
7.3.310.0070.00016.29
7.3.300.0000.00716.07
7.3.290.0080.00616.20
7.3.280.0110.00816.25
7.3.270.0070.01017.40
7.3.260.0110.00816.45
7.3.250.0100.00716.39
7.3.240.0190.00316.62
7.3.230.0100.00716.54
7.3.210.0100.01316.31
7.3.200.0060.01119.39
7.3.190.0060.01216.30
7.3.180.0070.00916.18
7.3.170.0090.00816.32
7.3.160.0100.01016.52
7.3.120.0100.00714.79
7.2.330.0030.01416.44
7.2.320.0160.00716.72
7.2.310.0080.00816.61
7.2.300.0100.00616.73
7.2.290.0080.01216.67
7.2.00.0000.01419.14
7.1.100.0110.00817.86
7.1.70.0040.00417.29
7.1.60.0070.01719.32
7.1.50.0120.01216.87
7.1.00.0100.04322.36
7.0.200.0040.00416.46
7.0.140.0030.07322.09
7.0.90.0100.04719.91
7.0.80.0030.05719.96
7.0.70.0100.08319.89
7.0.60.0070.08019.96
7.0.50.0100.04020.30
7.0.40.0030.05320.18
7.0.30.0130.07719.98
7.0.20.0100.08020.08
7.0.10.0130.03720.12
7.0.00.0030.09320.13
5.6.280.0070.07021.02
5.6.240.0070.06720.68
5.6.230.0070.06720.68
5.6.220.0100.05320.62
5.6.210.0100.06020.66
5.6.200.0030.06021.03
5.6.190.0030.04721.04
5.6.180.0130.07020.96
5.6.170.0170.04021.08
5.6.160.0070.08021.08
5.6.150.0130.05320.94
5.6.140.0070.08021.13
5.6.130.0030.05321.08
5.6.120.0130.07321.01
5.6.110.0070.07321.13
5.6.100.0070.04721.16
5.6.90.0000.04721.02
5.6.80.0170.05020.41
5.6.70.0030.08320.40
5.6.60.0070.08020.38
5.6.50.0100.07320.41
5.6.40.0130.08020.38
5.6.30.0130.07720.53
5.6.20.0100.05720.25
5.6.10.0070.06720.46
5.6.00.0200.05020.45
5.5.380.0030.07720.41
5.5.370.0030.04720.37
5.5.360.0070.05720.32
5.5.350.0170.07320.40
5.5.340.0030.08020.64
5.5.330.0030.04320.91
5.5.320.0170.07320.64
5.5.310.0170.05720.89
5.5.300.0000.05320.83
5.5.290.0170.07020.77
5.5.280.0070.06720.92
5.5.270.0070.05320.86
5.5.260.0070.08020.85
5.5.250.0130.07320.54
5.5.240.0070.08020.32
5.5.230.0100.08320.28
5.5.220.0070.07320.23
5.5.210.0100.05320.11
5.5.200.0100.08020.29
5.5.190.0130.03720.25
5.5.180.0070.07020.15
5.5.160.0030.08720.18
5.5.150.0000.08020.27
5.5.140.0130.06320.14
5.5.130.0030.08720.24
5.5.120.0100.07720.17
5.5.110.0070.07720.17
5.5.100.0070.06319.95
5.5.90.0100.07020.07
5.5.80.0100.05720.11
5.5.70.0070.07020.14
5.5.60.0070.05020.13
5.5.50.0170.07020.04
5.5.40.0130.07320.06
5.5.30.0030.04720.15
5.5.20.0270.06720.00
5.5.10.0070.06020.06
5.5.00.0130.08020.09
5.4.450.0100.05019.52
5.4.440.0000.08719.18
5.4.430.0100.06319.20
5.4.420.0130.07719.53
5.4.410.0030.05019.32
5.4.400.0070.07719.10
5.4.390.0130.07319.03
5.4.380.0030.07719.13
5.4.370.0000.05719.18
5.4.360.0100.07018.85
5.4.350.0030.08019.16
5.4.340.0200.06019.21
5.4.320.0100.07319.14
5.4.310.0170.03018.86
5.4.300.0130.06719.18
5.4.290.0030.06719.24
5.4.280.0070.08019.12
5.4.270.0070.07319.09
5.4.260.0000.08718.89
5.4.250.0100.04718.94
5.4.240.0000.04319.02
5.4.230.0070.04319.22
5.4.220.0070.04319.15
5.4.210.0100.04718.93
5.4.200.0070.07318.93
5.4.190.0130.07718.91
5.4.180.0170.06718.93
5.4.170.0070.04719.04
5.4.160.0170.07319.16
5.4.150.0070.08319.11
5.4.140.0070.08016.42
5.4.130.0070.06716.41
5.4.120.0000.04716.44
5.4.110.0070.07716.42
5.4.100.0130.06716.56
5.4.90.0030.04316.56
5.4.80.0070.03716.38
5.4.70.0070.07716.54
5.4.60.0030.07016.41
5.4.50.0170.03016.48
5.4.40.0000.05016.49
5.4.30.0070.06316.45
5.4.20.0000.08016.36
5.4.10.0100.06016.31
5.4.00.0000.06315.73
5.3.290.0070.07714.73
5.3.280.0030.08014.72
5.3.270.0170.05714.75
5.3.260.0030.05714.58
5.3.250.0070.05314.67
5.3.240.0000.04314.55
5.3.230.0100.07314.73
5.3.220.0030.07714.55
5.3.210.0030.04714.55
5.3.200.0070.03714.63
5.3.190.0170.07014.57
5.3.180.0270.06714.63
5.3.170.0100.07314.62
5.3.160.0070.07714.70
5.3.150.0070.06314.56
5.3.140.0130.06714.61
5.3.130.0070.06714.53
5.3.120.0070.05714.67
5.3.110.0070.08014.61
5.3.100.0070.07713.99
5.3.90.0070.06714.04
5.3.80.0070.06714.09
5.3.70.0030.07314.13
5.3.60.0070.07014.00
5.3.50.0100.06713.89
5.3.40.0030.07713.96
5.3.30.0030.06313.83
5.3.20.0030.05013.68
5.3.10.0070.07313.58
5.3.00.0000.07313.75
5.2.170.0070.06311.16
5.2.160.0070.04711.05
5.2.150.0030.05011.17
5.2.140.0100.05711.26
5.2.130.0030.06311.25
5.2.120.0000.04311.16
5.2.110.0030.06311.02
5.2.100.0030.05711.13
5.2.90.0070.05711.16
5.2.80.0070.05710.96
5.2.70.0070.06011.19
5.2.60.0070.06010.96
5.2.50.0100.04311.11
5.2.40.0100.05011.10
5.2.30.0030.04710.88
5.2.20.0030.06011.10
5.2.10.0100.05710.93
5.2.00.0130.05010.79
5.1.60.0070.03310.12
5.1.50.0070.02710.00
5.1.40.0030.04710.08
5.1.30.0070.05710.48
5.1.20.0100.05010.46
5.1.10.0100.04310.17
5.1.00.0030.0539.93
5.0.50.0070.0408.54
5.0.40.0100.0378.45
5.0.30.0070.0608.32
5.0.20.0030.0438.29
5.0.10.0000.0378.16
5.0.00.0000.0478.19
4.4.90.0030.0337.26
4.4.80.0070.0277.26
4.4.70.0030.0307.26
4.4.60.0000.0377.26
4.4.50.0030.0337.26
4.4.40.0030.0337.26
4.4.30.0030.0337.26
4.4.20.0030.0337.26
4.4.10.0000.0337.26
4.4.00.0000.0577.26
4.3.110.0000.0337.26
4.3.100.0070.0307.26
4.3.90.0030.0337.26
4.3.80.0030.0537.26
4.3.70.0030.0337.26
4.3.60.0000.0277.26
4.3.50.0030.0277.26
4.3.40.0030.0507.26
4.3.30.0030.0337.26
4.3.20.0030.0237.26
4.3.10.0030.0337.26
4.3.00.0000.0377.26

preferences:
51.78 ms | 400 KiB | 5 Q