3v4l.org

run code in 300+ PHP versions simultaneously
<?php $subjects = array( array( 'class' => 'one', 'sub' => 'music', ), array( 'class' => 'one', 'sub' => array( 'social', 'health', 'science' ), ), array( 'class' => 'two', 'sub' => 'music', ), array( 'class' => 'one', 'sub' => 'math', ) ); $class_sub = array(); $result = array(); foreach( $subjects as $sub ) { if ( ! isset( $class_sub[ $sub['class'] ] ) ) { $class_sub[ $sub['class'] ] = $sub['sub']; } else { if ( is_array( $class_sub[ $sub['class'] ] ) ) { $new = array_merge( $class_sub[ $sub['class'] ], is_array($sub['sub']) ? $sub['sub'] : array($sub['sub'])); } else { $new = array_merge( array($class_sub[ $sub['class'] ]), is_array($sub['sub']) ? $sub['sub'] : array($sub['sub'])); } $class_sub[ $sub['class'] ] = $new; } } foreach( $class_sub as $class => $sub ) { $result[] = array( 'class' => $class, 'sub' => $sub ); } echo "<pre>"; print_r( $result ); echo "</pre>";

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)
8.3.60.0140.00318.18
8.3.50.0040.01116.64
8.3.40.0070.01418.67
8.3.30.0060.00918.75
8.3.20.0080.00024.18
8.3.10.0070.00024.66
8.3.00.0090.00026.16
8.2.180.0070.00725.92
8.2.170.0110.00418.79
8.2.160.0180.00022.96
8.2.150.0040.00425.66
8.2.140.0080.00024.66
8.2.130.0070.00026.16
8.2.120.0040.01121.18
8.2.110.0150.00320.37
8.2.100.0120.00017.91
8.2.90.0040.00417.75
8.2.80.0040.00418.74
8.2.70.0040.00417.75
8.2.60.0040.00418.03
8.2.50.0080.00018.07
8.2.40.0060.00618.34
8.2.30.0000.00818.07
8.2.20.0040.00418.21
8.2.10.0040.00419.21
8.2.00.0000.00719.27
8.1.280.0100.01025.92
8.1.270.0070.00023.99
8.1.260.0050.00226.35
8.1.250.0070.00028.09
8.1.240.0060.00321.06
8.1.230.0070.00417.82
8.1.220.0040.00417.74
8.1.210.0040.00418.77
8.1.200.0080.00017.35
8.1.190.0030.00617.23
8.1.180.0050.00218.10
8.1.170.0080.00018.38
8.1.160.0040.00418.91
8.1.150.0000.00718.92
8.1.140.0070.00018.82
8.1.130.0000.00720.09
8.1.120.0040.00417.55
8.1.110.0040.00417.50
8.1.100.0050.00217.37
8.1.90.0080.00017.36
8.1.80.0040.00417.49
8.1.70.0000.00717.36
8.1.60.0000.00817.59
8.1.50.0060.00317.57
8.1.40.0000.00817.44
8.1.30.0040.00417.74
8.1.20.0040.00417.64
8.1.10.0080.00017.60
8.1.00.0040.00417.60
8.0.300.0070.00318.77
8.0.290.0040.00416.75
8.0.280.0020.00518.46
8.0.270.0030.00318.03
8.0.260.0060.00020.19
8.0.250.0040.00416.96
8.0.240.0040.00416.95
8.0.230.0000.00717.03
8.0.220.0050.00216.78
8.0.210.0040.00416.84
8.0.200.0070.00016.86
8.0.190.0000.00816.99
8.0.180.0000.00716.81
8.0.170.0080.00016.97
8.0.160.0030.00716.87
8.0.150.0040.00416.86
8.0.140.0050.00216.86
8.0.130.0060.00013.35
8.0.120.0000.01016.79
8.0.110.0000.00716.93
8.0.100.0050.00316.97
8.0.90.0040.00416.77
8.0.80.0070.00816.78
8.0.70.0000.00716.87
8.0.60.0040.00416.71
8.0.50.0000.00816.71
8.0.30.0110.01117.05
8.0.20.0130.00817.19
8.0.10.0000.00817.10
8.0.00.0090.00916.74
7.4.330.0000.00515.55
7.4.320.0030.00316.66
7.4.300.0040.00416.46
7.4.290.0000.00716.64
7.4.280.0040.00416.43
7.4.270.0040.00416.61
7.4.260.0050.00013.29
7.4.250.0000.00816.49
7.4.240.0000.00716.66
7.4.230.0000.00716.63
7.4.220.0040.00316.60
7.4.210.0070.00816.66
7.4.200.0030.00316.60
7.4.130.0120.01016.63
7.4.120.0180.00316.56
7.4.110.0090.01416.65
7.4.100.0140.01016.57
7.4.90.0060.01316.37
7.4.80.0090.00916.30
7.4.70.0080.00816.36
7.4.60.0110.00616.38
7.4.50.0180.00016.31
7.4.40.0100.00716.22
7.4.30.0130.00316.61
7.4.20.0090.00916.27
7.4.10.0170.00016.34
7.4.00.0140.00416.33
7.3.330.0000.00816.18
7.3.320.0030.00313.17
7.3.310.0070.00016.38
7.3.300.0040.00416.20
7.3.290.0090.00616.38
7.3.280.0060.00916.31
7.3.260.0160.00316.59
7.3.230.0140.00716.60
7.3.210.0140.00316.51
7.3.200.0140.00316.45
7.3.190.0150.00316.59
7.3.180.0000.01616.14
7.3.170.0110.00616.29
7.3.160.0070.01016.57
7.3.150.0110.00716.11
7.3.140.0090.00916.36
7.3.130.0110.00716.21
7.3.120.0140.00316.55
7.3.110.0140.00316.28
7.3.100.0070.01116.17
7.3.90.0040.01416.39
7.3.80.0140.00416.54
7.3.70.0050.01516.41
7.3.60.0130.00615.99
7.3.50.0140.00716.05
7.3.40.0200.00316.14
7.3.30.0110.01516.00
7.3.20.0190.00316.29
7.3.10.0130.01316.52
7.3.00.0120.01216.45
7.2.330.0040.01416.39
7.2.320.0120.00616.40
7.2.310.0070.01016.43
7.2.300.0130.00616.41
7.2.290.0090.00916.48
7.2.280.0090.00916.64
7.2.270.0030.01416.50
7.2.260.0140.00616.23
7.2.250.0100.00916.71
7.2.240.0120.00616.66
7.2.230.0150.00416.67
7.2.220.0120.00616.69
7.2.210.0060.01516.63
7.2.200.0060.01516.23
7.2.190.0070.01416.14
7.2.180.0160.01016.51
7.2.170.0060.01616.29
7.2.160.0180.00916.68
7.2.150.0140.00716.55
7.2.140.0130.01016.51
7.2.130.0120.01516.70
7.2.120.0040.01716.45
7.2.110.0100.01316.38
7.2.100.0100.01316.41
7.2.90.0390.01116.39
7.2.80.0200.01016.46
7.2.70.0110.01416.19
7.2.60.0150.00916.41
7.2.50.0040.02116.27
7.2.40.0230.00016.57
7.2.30.0240.00616.45
7.2.20.0210.00316.42
7.2.10.0100.01316.55
7.2.00.0060.01316.62

preferences:
46.12 ms | 400 KiB | 5 Q