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<?php $i=0; $time = microtime(true); while($i < 5000) { $i++; @preg_replace('/(^|[a-z])([A-Z])/e', 'strtolower(strlen("\\1") ? "\\1_\\2" : "\\2")', 'VeryLongClassName'); } $time = microtime(true) - $time; echo '1: ' . number_format($time, 3) ."\n"; $i=0; $time = microtime(true); while($i < 5000) { $i++; @preg_replace('/(?!^)[[:upper:]][[:lower:]]/', '$0', preg_replace('/(?!^)[[:upper:]]+/', '_'.'$0', 'VeryLongClassName')); } $time = microtime(true) - $time; echo '2: ' . number_format($time, 3) ."\n";
Output for 7.0.10, 7.0.12, 7.0.28, 7.1.18, 7.3.5, 7.3.10, 7.3.12, 7.4.1
1: 0.007 2: 0.006
Output for 7.3.4, 7.3.11, 7.4.0
1: 0.008 2: 0.006
Output for 7.2.5 - 7.2.6, 7.2.8, 7.2.10 - 7.2.11, 7.2.14, 7.2.19 - 7.2.20, 7.2.24, 7.3.6 - 7.3.7, 7.3.13
1: 0.005 2: 0.004
Output for 7.2.26, 7.3.2, 7.3.9
1: 0.007 2: 0.004
Output for 7.3.8
1: 0.008 2: 0.003
Output for 7.2.3 - 7.2.4, 7.2.9, 7.2.16 - 7.2.17, 7.3.3
1: 0.006 2: 0.004
Output for 7.3.1
1: 0.006 2: 0.003
Output for 7.0.8, 7.0.13, 7.0.21 - 7.0.22, 7.0.26, 7.0.29, 7.0.32, 7.1.1, 7.1.3, 7.1.8, 7.1.10 - 7.1.11, 7.1.13, 7.1.22, 7.1.30, 7.2.7, 7.2.18, 7.3.0
1: 0.006 2: 0.005
Output for 7.2.1, 7.2.12, 7.2.25
1: 0.007 2: 0.007
Output for 7.1.5, 7.1.23, 7.1.33, 7.2.23
1: 0.006 2: 0.006
Output for 7.2.2, 7.2.22
1: 0.008 2: 0.007
Output for 7.2.13, 7.2.15, 7.2.21
1: 0.008 2: 0.004
Output for 7.0.4, 7.0.15, 7.0.24, 7.1.6, 7.1.9, 7.1.14, 7.1.16, 7.1.21, 7.1.25, 7.1.29, 7.2.0
1: 0.007 2: 0.005
Output for 7.0.7, 7.1.0, 7.1.24, 7.1.32
1: 0.008 2: 0.008
Output for 7.0.18 - 7.0.20, 7.0.30 - 7.0.31, 7.1.2, 7.1.7, 7.1.12, 7.1.15, 7.1.28, 7.1.31
1: 0.005 2: 0.005
Output for 7.0.5 - 7.0.6, 7.0.9, 7.0.14, 7.0.16 - 7.0.17, 7.0.25, 7.0.27, 7.0.33, 7.1.4, 7.1.17, 7.1.19 - 7.1.20, 7.1.26 - 7.1.27
1: 0.008 2: 0.005
Output for 7.0.23
1: 0.009 2: 0.005
Output for 7.0.0 - 7.0.3, 7.0.11
1: 0.008 2: 0.009
Output for 5.6.31, 5.6.38, 5.6.40
1: 0.113 2: 0.025
Output for 5.6.20, 5.6.39
1: 0.112 2: 0.025
Output for 5.6.37
1: 0.114 2: 0.026
Output for 5.6.36
1: 0.155 2: 0.028
Output for 5.6.35
1: 0.136 2: 0.032
Output for 5.5.31, 5.6.34
1: 0.117 2: 0.025
Output for 5.5.37, 5.6.33
1: 0.114 2: 0.025
Output for 5.5.34, 5.6.32
1: 0.111 2: 0.025
Output for 5.5.25, 5.6.30
1: 0.113 2: 0.026
Output for 5.6.29
1: 0.135 2: 0.029
Output for 5.5.19, 5.5.22, 5.6.0 - 5.6.1, 5.6.27 - 5.6.28
1: 0.110 2: 0.025
Output for 5.6.26
1: 0.118 2: 0.025
Output for 5.6.25
1: 0.148 2: 0.032
Output for 5.6.24
1: 0.130 2: 0.029
Output for 5.3.26, 5.5.16, 5.6.23
1: 0.116 2: 0.025
Output for 5.6.22
1: 0.140 2: 0.031
Output for 5.4.32, 5.5.23, 5.6.21
1: 0.111 2: 0.026
Output for 5.6.19
1: 0.134 2: 0.030
Output for 5.6.18
1: 0.178 2: 0.025
Output for 5.6.17
1: 0.124 2: 0.025
Output for 5.5.20, 5.6.16
1: 0.132 2: 0.029
Output for 5.6.15
1: 0.117 2: 0.040
Output for 5.5.30, 5.6.14
1: 0.126 2: 0.040
Output for 5.6.13
1: 0.125 2: 0.025
Output for 5.6.12
1: 0.137 2: 0.025
Output for 5.6.11
1: 0.114 2: 0.036
Output for 5.6.10
1: 0.135 2: 0.025
Output for 5.6.7, 5.6.9
1: 0.130 2: 0.028
Output for 5.6.8
1: 0.137 2: 0.039
Output for 5.6.6
1: 0.146 2: 0.025
Output for 5.6.5
1: 0.138 2: 0.040
Output for 5.6.4
1: 0.150 2: 0.026
Output for 5.6.3
1: 0.121 2: 0.026
Output for 5.6.2
1: 0.111 2: 0.027
Output for 5.5.38
1: 0.122 2: 0.025
Output for 5.5.36
1: 0.135 2: 0.028
Output for 5.5.35
1: 0.121 2: 0.025
Output for 5.5.33
1: 0.168 2: 0.025
Output for 5.5.32
1: 0.113 2: 0.029
Output for 5.5.29
1: 0.146 2: 0.029
Output for 5.5.28
1: 0.133 2: 0.030
Output for 5.5.27
1: 0.135 2: 0.027
Output for 5.5.26
1: 0.110 2: 0.040
Output for 5.5.24
1: 0.112 2: 0.026
Output for 5.5.21
1: 0.129 2: 0.028
Output for 5.5.18
1: 0.120 2: 0.030
Output for 5.5.17
1: 0.137 2: 0.026
Output for 5.5.15
1: 0.140 2: 0.026
Output for 5.5.14
1: 0.171 2: 0.028
Output for 5.5.13
1: 0.141 2: 0.039
Output for 5.5.12
1: 0.162 2: 0.041
Output for 5.5.11
1: 0.145 2: 0.025
Output for 5.5.10
1: 0.118 2: 0.027
Output for 5.5.9
1: 0.137 2: 0.024
Output for 5.5.8
1: 0.123 2: 0.028
Output for 5.5.7
1: 0.111 2: 0.031
Output for 5.5.6
1: 0.129 2: 0.032
Output for 5.5.5
1: 0.164 2: 0.025
Output for 5.5.4
1: 0.129 2: 0.029
Output for 5.5.3
1: 0.108 2: 0.024
Output for 5.4.22, 5.5.2
1: 0.109 2: 0.025
Output for 5.5.1
1: 0.109 2: 0.039
Output for 5.5.0
1: 0.160 2: 0.025
Output for 5.4.45
1: 0.125 2: 0.024
Output for 5.4.36, 5.4.44
1: 0.102 2: 0.025
Output for 5.4.1 - 5.4.2, 5.4.6, 5.4.29, 5.4.31, 5.4.43
1: 0.100 2: 0.025
Output for 5.4.42
1: 0.114 2: 0.039
Output for 5.4.41
1: 0.113 2: 0.024
Output for 5.3.19, 5.4.14, 5.4.40
1: 0.096 2: 0.024
Output for 5.4.39
1: 0.101 2: 0.024
Output for 5.4.38
1: 0.122 2: 0.024
Output for 5.4.37
1: 0.111 2: 0.029
Output for 5.4.35
1: 0.119 2: 0.038
Output for 5.4.34
1: 0.102 2: 0.024
Output for 5.4.33
1: 0.110 2: 0.026
Output for 5.4.12, 5.4.30
1: 0.100 2: 0.024
Output for 5.4.28
1: 0.116 2: 0.026
Output for 5.4.9, 5.4.27
1: 0.097 2: 0.024
Output for 5.4.26
1: 0.104 2: 0.025
Output for 5.3.21, 5.4.25
1: 0.138 2: 0.024
Output for 5.4.24
1: 0.114 2: 0.037
Output for 5.4.23
1: 0.124 2: 0.035
Output for 5.4.21
1: 0.103 2: 0.024
Output for 5.4.19 - 5.4.20
1: 0.099 2: 0.024
Output for 5.4.18
1: 0.115 2: 0.026
Output for 5.4.17
1: 0.114 2: 0.038
Output for 5.4.16
1: 0.141 2: 0.026
Output for 5.4.15
1: 0.109 2: 0.024
Output for 5.4.13
1: 0.102 2: 0.026
Output for 5.4.11
1: 0.141 2: 0.035
Output for 5.4.10
1: 0.134 2: 0.023
Output for 5.4.8
1: 0.125 2: 0.036
Output for 5.4.7
1: 0.095 2: 0.025
Output for 5.4.5
1: 0.114 2: 0.027
Output for 5.4.4
1: 0.098 2: 0.024
Output for 5.4.3
1: 0.102 2: 0.027
Output for 5.4.0
1: 0.098 2: 0.025
Output for 5.3.16, 5.3.29
1: 0.090 2: 0.023
Output for 5.3.28
1: 0.142 2: 0.038
Output for 5.3.27
1: 0.092 2: 0.024
Output for 5.3.25
1: 0.101 2: 0.027
Output for 5.3.24
1: 0.093 2: 0.025
Output for 5.3.23
1: 0.098 2: 0.031
Output for 5.3.22
1: 0.087 2: 0.021
Output for 5.3.20
1: 0.141 2: 0.021
Output for 5.3.18
1: 0.086 2: 0.023
Output for 5.3.10, 5.3.17
1: 0.084 2: 0.022
Output for 5.3.15
1: 0.090 2: 0.022
Output for 5.3.7, 5.3.12, 5.3.14
1: 0.086 2: 0.022
Output for 5.3.13
1: 0.088 2: 0.022
Output for 5.3.11
1: 0.089 2: 0.022
Output for 5.3.8 - 5.3.9
1: 0.087 2: 0.022
Output for 5.3.6
1: 0.112 2: 0.022
Output for 5.3.5
1: 0.122 2: 0.022
Output for 5.3.4
1: 0.085 2: 0.036
Output for 5.3.3
1: 0.107 2: 0.025
Output for 5.3.2
1: 0.091 2: 0.022
Output for 5.3.1
1: 0.095 2: 0.021
Output for 5.3.0
1: 0.103 2: 0.022
Output for 5.2.0 - 5.2.1, 5.2.3, 5.2.9, 5.2.17
1: 0.057 2: 0.012
Output for 4.3.9, 5.2.2, 5.2.16
1: 0.065 2: 0.013
Output for 4.4.0 - 4.4.1, 4.4.3, 5.2.15
1: 0.062 2: 0.013
Output for 5.2.13 - 5.2.14
1: 0.059 2: 0.012
Output for 5.2.12
1: 0.058 2: 0.012
Output for 5.2.11
1: 0.063 2: 0.014
Output for 5.2.10
1: 0.061 2: 0.012
Output for 5.2.8
1: 0.070 2: 0.015
Output for 5.2.7
1: 0.055 2: 0.012
Output for 5.2.6
1: 0.058 2: 0.011
Output for 5.2.5
1: 0.054 2: 0.012
Output for 5.2.4
1: 0.059 2: 0.011
Output for 5.1.6
1: 0.075 2: 0.014
Output for 4.3.1, 5.0.5, 5.1.5
1: 0.070 2: 0.013
Output for 5.1.4
1: 0.070 2: 0.012
Output for 4.3.2, 5.1.3
1: 0.064 2: 0.012
Output for 5.1.2
1: 0.069 2: 0.012
Output for 5.1.0 - 5.1.1
1: 0.068 2: 0.012
Output for 5.0.4
1: 0.078 2: 0.013
Output for 5.0.3
1: 0.074 2: 0.013
Output for 5.0.2
1: 0.071 2: 0.012
Output for 4.4.7, 5.0.1
1: 0.067 2: 0.013
Output for 4.4.4, 5.0.0
1: 0.068 2: 0.013
Output for 4.4.9
1: 0.064 2: 0.013
Output for 4.4.8
1: 0.077 2: 0.013
Output for 4.3.3, 4.4.6
1: 0.068 2: 0.014
Output for 4.4.5
1: 0.063 2: 0.013
Output for 4.4.2
1: 0.067 2: 0.015
Output for 4.3.4, 4.3.7, 4.3.10 - 4.3.11
1: 0.062 2: 0.012
Output for 4.3.8
1: 0.066 2: 0.012
Output for 4.3.6
1: 0.063 2: 0.012
Output for 4.3.5
1: 0.069 2: 0.014
Output for 4.3.0
1: 0.065 2: 0.012

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