3v4l.org

run code in 300+ PHP versions simultaneously
<?php //You must validate your input to make sure the string you pass is not empty and is, in fact, a string. An empty string is not valid JSON. function is_json($string) { return !empty($string) && is_string($string) && is_array(json_decode($string, true)) && json_last_error() == 0; } //I think in PHP it's more important to determine if the JSON object even has data, because to use the data you will need to call json_encode() //or json_decode(). I suggest denying empty JSON objects so you aren't unnecessarily running encodes and decodes on empty data. function has_json_data($string) { $array = json_decode($string, true); return !empty($string) && is_string($string) && is_array($array) && !empty($array) && json_last_error() == 0; } function isJson($string, $assoc = false) { var_dump(json_decode($string)); json_decode($string, $assoc); if(!empty($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); $c='{ "book": [ { "id":"01", "language": "Java", "edition": "third", "author": "Herbert Schildt" }, { "id":"07", "language": "C++", "edition": "second" "author": "E.Balagurusamy" }] }'; var_dump(isJson($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)
8.3.60.0030.01618.43
8.3.50.0090.01022.00
8.3.40.0000.01518.67
8.3.30.0070.00718.75
8.3.20.0050.00320.18
8.3.10.0040.00422.14
8.3.00.0080.00022.45
8.2.180.0140.00416.50
8.2.170.0090.00622.96
8.2.160.0140.00020.97
8.2.150.0080.00024.18
8.2.140.0070.00324.66
8.2.130.0040.00426.16
8.2.120.0080.00019.24
8.2.110.0060.00322.30
8.2.100.0000.01119.64
8.2.90.0040.00419.05
8.2.80.0040.00417.97
8.2.70.0030.00517.63
8.2.60.0060.00318.04
8.2.50.0060.00618.07
8.2.40.0060.00318.16
8.2.30.0030.00618.10
8.2.20.0040.00417.60
8.2.10.0060.00319.52
8.2.00.0040.00417.82
8.1.280.0200.00025.92
8.1.270.0090.00022.14
8.1.260.0070.00426.35
8.1.250.0070.00028.09
8.1.240.0030.00624.00
8.1.230.0070.00418.97
8.1.220.0040.00417.74
8.1.210.0040.00418.77
8.1.200.0060.00317.36
8.1.190.0000.00817.53
8.1.180.0050.00318.10
8.1.170.0040.00418.46
8.1.160.0000.00721.95
8.1.150.0030.00518.71
8.1.140.0020.00517.38
8.1.130.0030.00517.81
8.1.120.0000.00717.45
8.1.110.0040.00417.38
8.1.100.0040.00417.43
8.1.90.0030.00317.43
8.1.80.0040.00417.54
8.1.70.0030.00517.46
8.1.60.0050.00317.66
8.1.50.0000.00817.57
8.1.40.0080.00017.59
8.1.30.0040.00417.52
8.1.20.0030.00517.66
8.1.10.0080.00017.47
8.1.00.0050.00317.46
8.0.300.0000.00718.77
8.0.290.0040.00417.18
8.0.280.0070.00018.52
8.0.270.0000.00717.29
8.0.260.0000.00616.75
8.0.250.0040.00416.91
8.0.240.0100.00016.97
8.0.230.0040.00416.96
8.0.220.0000.00716.83
8.0.210.0000.00716.81
8.0.200.0040.00416.96
8.0.190.0060.00316.99
8.0.180.0050.00216.85
8.0.170.0060.00316.89
8.0.160.0000.00716.85
8.0.150.0000.01016.76
8.0.140.0040.00416.72
8.0.130.0050.00013.36
8.0.120.0050.00316.86
8.0.110.0000.00716.84
8.0.100.0000.00716.94
8.0.90.0060.00316.98
8.0.80.0080.01116.87
8.0.70.0000.00716.95
8.0.60.0000.00716.80
8.0.50.0030.00516.74
8.0.30.0080.01317.10
8.0.20.0110.00717.40
8.0.10.0000.00816.95
8.0.00.0060.01116.78
7.4.330.0000.00515.07
7.4.320.0060.00016.55
7.4.300.0040.00416.59
7.4.290.0030.00516.44
7.4.280.0060.00016.52
7.4.270.0040.00416.55
7.4.260.0000.00716.53
7.4.250.0080.00016.59
7.4.240.0020.00616.58
7.4.230.0070.00016.62
7.4.220.0040.01416.52
7.4.210.0060.01216.57
7.4.200.0040.00416.52
7.4.190.0000.00716.79
7.4.160.0060.01016.53
7.4.150.0070.01017.40
7.4.140.0080.01117.86
7.4.130.0040.01216.42
7.4.120.0080.01016.53
7.4.110.0090.00616.52
7.4.100.0080.01116.38
7.4.90.0120.00616.46
7.4.80.0100.01019.39
7.4.70.0060.01416.71
7.4.60.0100.00616.58
7.4.50.0030.00616.40
7.4.40.0070.00722.77
7.4.30.0090.00616.58
7.4.00.0030.01315.19
7.3.330.0030.00313.07
7.3.320.0030.00313.29
7.3.310.0040.00416.28
7.3.300.0070.00016.25
7.3.290.0060.00916.27
7.3.280.0080.00916.26
7.3.270.0120.00617.40
7.3.260.0090.01516.37
7.3.250.0060.01016.56
7.3.240.0100.01016.46
7.3.230.0060.00916.53
7.3.210.0100.00716.47
7.3.200.0130.00716.47
7.3.190.0100.01316.47
7.3.180.0090.00716.23
7.3.170.0170.00416.29
7.3.160.0100.00616.57
7.3.120.0090.00414.86
7.2.330.0090.00916.72
7.2.320.0130.00616.66
7.2.310.0100.01316.74
7.2.300.0050.01616.80
7.2.290.0090.01416.66
7.2.00.0030.01019.45
7.1.100.0110.00417.69
7.1.70.0040.00416.86
7.1.60.0090.01519.82
7.1.50.0030.01716.85
7.1.00.0000.07722.54
7.0.200.0000.00716.86
7.0.140.0000.06722.18
7.0.90.0530.07319.98
7.0.80.0730.06719.84
7.0.70.0330.07719.88
7.0.60.0570.08020.04
7.0.50.0630.08320.35
7.0.40.0000.05020.09
7.0.30.0030.04320.15
7.0.20.0070.06720.14
7.0.10.0070.05719.95
7.0.00.0030.08720.10
5.6.280.0070.07020.79
5.6.230.0000.06720.46
5.6.220.0100.08020.64
5.6.210.0030.09020.43
5.6.200.0030.04721.04
5.6.190.0100.04721.05
5.6.180.0030.05321.04
5.6.170.0100.08021.02
5.6.160.0070.04721.02
5.6.150.0070.05321.01
5.6.140.0030.08321.04
5.6.130.0070.05021.18
5.6.120.0100.09021.06
5.6.110.0070.08021.00
5.6.100.0070.08721.01
5.6.90.0130.08021.08
5.6.80.0030.08320.41
5.6.70.0030.08020.55
5.6.60.0000.05720.45
5.6.50.0100.07020.39
5.6.40.0130.03020.45
5.6.30.0100.06320.44
5.6.20.0030.04320.46
5.6.10.0070.04720.32
5.6.00.0030.04720.38
5.5.370.0070.08320.41
5.5.360.0030.06320.34
5.5.350.0130.04720.35
5.5.340.0070.07720.74
5.5.330.0100.06020.89
5.5.320.0030.07720.84
5.5.310.0070.04720.88
5.5.300.0070.07020.93
5.5.290.0070.07320.90
5.5.280.0130.08320.91
5.5.270.0070.08020.81
5.5.260.0130.07320.80
5.5.250.0030.08720.55
5.5.240.0100.07720.29
5.5.230.0000.04720.22
5.5.220.0100.03320.25
5.5.210.0000.05020.14
5.5.200.0000.04320.14
5.5.190.0100.05720.18
5.5.180.0100.07320.29
5.5.160.0070.07720.25
5.5.150.0100.07019.99
5.5.140.0070.06320.00
5.5.130.0100.06320.27
5.5.120.0070.08020.09
5.5.110.0100.07720.11
5.5.100.0130.07320.13
5.5.90.0100.06720.13
5.5.80.0100.07320.07
5.5.70.0130.07720.11
5.5.60.0100.04720.06
5.5.50.0100.04320.07
5.5.40.0070.07319.97
5.5.30.0030.04720.14
5.5.20.0030.05020.14
5.5.10.0130.06020.04
5.5.00.0030.05719.94
5.4.450.0070.06719.23
5.4.440.0070.07019.27
5.4.430.0130.07719.32
5.4.420.0130.07019.55
5.4.410.0100.07019.32
5.4.400.0070.06019.23
5.4.390.0070.06319.12
5.4.380.0000.08019.03
5.4.370.0070.03719.19
5.4.360.0000.04319.12
5.4.350.0000.06019.09
5.4.340.0070.04718.90
5.4.320.0070.08018.88
5.4.310.0000.08319.18
5.4.300.0100.07319.16
5.4.290.0130.07018.87
5.4.280.0130.07319.02
5.4.270.0030.07318.96
5.4.260.0130.07018.87
5.4.250.0030.04719.04
5.4.240.0030.08319.18
5.4.230.0070.05319.15
5.4.220.0130.07019.12
5.4.210.0070.03718.87
5.4.200.0100.06019.02
5.4.190.0130.06718.84
5.4.180.0000.04019.04
5.4.170.0100.07019.02
5.4.160.0070.08319.07
5.4.150.0070.07018.88
5.4.140.0100.07016.47
5.4.130.0070.07316.41
5.4.120.0130.03016.44
5.4.110.0100.05316.38
5.4.100.0100.07316.49
5.4.90.0000.07316.58
5.4.80.0030.05016.39
5.4.70.0130.06316.51
5.4.60.0030.07316.33
5.4.50.0070.07016.45
5.4.40.0070.07316.36
5.4.30.0000.04016.39
5.4.20.0200.05016.36
5.4.10.0030.07316.46
5.4.00.0030.03715.83
5.3.290.0030.07714.80
5.3.280.0030.06314.66
5.3.270.0030.05714.61
5.3.260.0100.06314.62
5.3.250.0070.08014.64
5.3.240.0070.06014.70
5.3.230.0030.05714.59
5.3.220.0130.07014.66
5.3.210.0130.07714.59
5.3.200.0030.05014.57
5.3.190.0100.05314.69
5.3.180.0130.06714.69
5.3.170.0130.06714.55
5.3.160.0070.03714.56
5.3.150.0030.03714.68
5.3.140.0030.04714.67
5.3.130.0100.05714.51
5.3.120.0030.04014.68
5.3.110.0100.06014.57
5.3.100.0030.06313.99
5.3.90.0030.03714.15
5.3.80.0000.04014.05
5.3.70.0100.07014.09
5.3.60.0000.06313.91
5.3.50.0100.06714.01
5.3.40.0070.07313.97
5.3.30.0000.07313.98
5.3.20.0000.04313.68
5.3.10.0130.06713.72
5.3.00.0070.07013.71
5.2.170.0030.02711.25
5.2.160.0070.04311.06
5.2.150.0000.05311.28
5.2.140.0030.06311.08
5.2.130.0100.06011.17
5.2.120.0070.06311.13
5.2.110.0070.06011.24
5.2.100.0070.05711.02
5.2.90.0100.05711.04
5.2.80.0030.06711.24
5.2.70.0030.05311.13
5.2.60.0130.02310.92
5.2.50.0030.06011.02
5.2.40.0000.03311.09
5.2.30.0030.05310.98
5.2.20.0030.06311.11
5.2.10.0100.05310.73
5.2.00.0030.03310.68
5.1.60.0070.04010.20
5.1.50.0000.02710.20
5.1.40.0030.02310.20
5.1.30.0000.03010.34
5.1.20.0000.02710.37
5.1.10.0030.02310.20
5.1.00.0000.02710.20
5.0.50.0000.02010.20
5.0.40.0030.01710.20
5.0.30.0000.03310.20
5.0.20.0000.02010.20
5.0.10.0000.01710.20
5.0.00.0000.03710.20
4.4.90.0030.01710.20
4.4.80.0030.03310.20
4.4.70.0000.02310.20
4.4.60.0130.02310.20
4.4.50.0000.02710.20
4.4.40.0030.02310.20
4.4.30.0030.01310.20
4.4.20.0000.01710.20
4.4.10.0000.01710.20
4.4.00.0000.02710.20
4.3.110.0000.01710.20
4.3.100.0000.01710.20
4.3.90.0000.01710.20
4.3.80.0000.02310.20
4.3.70.0030.01310.20
4.3.60.0030.01310.20
4.3.50.0000.01710.20
4.3.40.0000.02310.20
4.3.30.0000.01710.20
4.3.20.0000.01710.20
4.3.10.0030.01310.20
4.3.00.0000.02010.20

preferences:
50.29 ms | 400 KiB | 5 Q