3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $count = 100; $start = microtime(true); $a = ''; for($i = 0; $i < $count; $i++) { $a .= 'a'; } printf("#1, done in %f\n", microtime(true) - $start); $start = microtime(true); $a = ""; for($i = 0; $i < $count; $i++) { $a .= "a"; } printf("#2, done in %f\n", microtime(true) - $start);
Output for 5.4.16, 5.4.22, 5.4.45 - 5.5.0, 5.6.26, 7.0.12, 7.1.0
#1, done in 0.000008 #2, done in 0.000005
Output for 5.2.9, 5.2.16, 5.3.10, 5.3.19, 5.3.24, 5.4.0, 5.4.2, 5.4.24, 5.4.35, 5.5.8, 5.5.12, 5.5.21, 5.5.24, 5.6.9, 5.6.22, 7.0.14
#1, done in 0.000010 #2, done in 0.000008
Output for 7.0.11
#1, done in 0.000009 #2, done in 0.000008
Output for 7.0.6, 7.0.10
#1, done in 0.000008 #2, done in 0.000003
Output for 7.0.9
#1, done in 0.000007 #2, done in 0.000003
Output for 7.0.8
#1, done in 0.000006 #2, done in 0.000003
Output for 5.2.11, 5.3.7, 5.4.36, 5.5.4, 5.5.14, 5.5.16, 5.5.25, 5.5.29, 5.5.36, 5.6.6, 5.6.24, 7.0.7
#1, done in 0.000009 #2, done in 0.000007
Output for 7.0.5
#1, done in 0.000012 #2, done in 0.000004
Output for 7.0.4
#1, done in 0.000005 #2, done in 0.000003
Output for 5.4.1, 5.4.4, 5.5.19, 5.6.1, 5.6.5, 7.0.3
#1, done in 0.000006 #2, done in 0.000004
Output for 5.2.2, 5.3.21 - 5.3.22, 7.0.2
#1, done in 0.000007 #2, done in 0.000006
Output for 5.5.38, 7.0.1
#1, done in 0.000007 #2, done in 0.000004
Output for 7.0.0
#1, done in 0.000004 #2, done in 0.000003
Output for hhvm-3.13.2
#1, done in 0.000052 #2, done in 0.000010
Output for hhvm-3.12.0
#1, done in 0.000032 #2, done in 0.000011
Output for hhvm-3.10.0
#1, done in 0.000026 #2, done in 0.000013
Output for 5.2.8, 5.6.25
#1, done in 0.000007 #2, done in 0.000009
Output for 5.2.3, 5.4.3, 5.4.26, 5.4.42, 5.5.9, 5.5.20, 5.5.37, 5.6.23
#1, done in 0.000010 #2, done in 0.000007
Output for 5.3.14, 5.4.9, 5.4.37, 5.5.28, 5.6.3 - 5.6.4, 5.6.21
#1, done in 0.000006 #2, done in 0.000005
Output for 5.5.23, 5.6.20
#1, done in 0.000009 #2, done in 0.000010
Output for 5.3.16, 5.3.20, 5.3.23, 5.3.27, 5.4.6, 5.4.10 - 5.4.11, 5.4.13, 5.4.19, 5.4.25, 5.4.34, 5.4.39, 5.4.43 - 5.4.44, 5.5.31, 5.6.10, 5.6.12, 5.6.14 - 5.6.16, 5.6.19
#1, done in 0.000007 #2, done in 0.000005
Output for 5.5.34, 5.6.18
#1, done in 0.000010 #2, done in 0.000006
Output for 5.6.17
#1, done in 0.000011 #2, done in 0.000005
Output for 5.6.13
#1, done in 0.000009 #2, done in 0.000009
Output for 5.3.0, 5.5.5, 5.5.10, 5.5.27, 5.6.11
#1, done in 0.000008 #2, done in 0.000007
Output for 5.6.8
#1, done in 0.000010 #2, done in 0.000013
Output for 5.1.5, 5.3.3, 5.4.18, 5.4.27, 5.4.30 - 5.4.31, 5.5.6, 5.5.26, 5.6.2, 5.6.7
#1, done in 0.000011 #2, done in 0.000008
Output for 5.5.15, 5.6.0
#1, done in 0.000010 #2, done in 0.000011
Output for 5.3.2, 5.3.6, 5.3.18, 5.4.15, 5.5.22, 5.5.35
#1, done in 0.000008 #2, done in 0.000006
Output for 5.5.33
#1, done in 0.000008 #2, done in 0.000010
Output for 5.5.32
#1, done in 0.000013 #2, done in 0.000009
Output for 5.3.4, 5.3.9, 5.5.30
#1, done in 0.000012 #2, done in 0.000009
Output for 5.4.8, 5.4.14, 5.4.21, 5.4.28, 5.5.2, 5.5.11, 5.5.18
#1, done in 0.000009 #2, done in 0.000006
Output for 5.5.13
#1, done in 0.000009 #2, done in 0.000004
Output for 5.3.28, 5.4.7, 5.5.7
#1, done in 0.000008 #2, done in 0.000008
Output for 5.3.11, 5.4.12, 5.5.3
#1, done in 0.000007 #2, done in 0.000007
Output for 5.5.1
#1, done in 0.000008 #2, done in 0.000009
Output for 5.4.41
#1, done in 0.000010 #2, done in 0.000012
Output for 5.4.40
#1, done in 0.000006 #2, done in 0.000007
Output for 5.3.17, 5.3.29, 5.4.38
#1, done in 0.000012 #2, done in 0.000010
Output for 5.4.32
#1, done in 0.000010 #2, done in 0.000009
Output for 5.2.12, 5.3.12, 5.3.25, 5.4.29
#1, done in 0.000011 #2, done in 0.000009
Output for 5.3.1, 5.4.23
#1, done in 0.000007 #2, done in 0.000008
Output for 5.4.20
#1, done in 0.000005 #2, done in 0.000004
Output for 5.4.17
#1, done in 0.000012 #2, done in 0.000011
Output for 5.4.5
#1, done in 0.000006 #2, done in 0.000006
Output for 5.2.1, 5.3.26
#1, done in 0.000013 #2, done in 0.000010
Output for 5.3.15
#1, done in 0.000011 #2, done in 0.000006
Output for 5.3.13
#1, done in 0.000007 #2, done in 0.000011
Output for 5.3.8
#1, done in 0.000012 #2, done in 0.000014
Output for 5.3.5
#1, done in 0.000006 #2, done in 0.000010
Output for 5.2.0, 5.2.17
#1, done in 0.000015 #2, done in 0.000012
Output for 5.2.6, 5.2.15
#1, done in 0.000026 #2, done in 0.000023
Output for 5.2.14
#1, done in 0.000014 #2, done in 0.000011
Output for 5.2.13
#1, done in 0.000016 #2, done in 0.000012
Output for 5.2.10
#1, done in 0.000014 #2, done in 0.000019
Output for 5.2.7
#1, done in 0.000016 #2, done in 0.000013
Output for 5.1.1, 5.2.5
#1, done in 0.000015 #2, done in 0.000011
Output for 5.2.4
#1, done in 0.000012 #2, done in 0.000008
Output for 5.1.6
#1, done in 0.000019 #2, done in 0.000015
Output for 5.1.0, 5.1.4
#1, done in 0.000018 #2, done in 0.000014
Output for 5.1.3
#1, done in 0.000016 #2, done in 0.000023
Output for 5.1.2
#1, done in 0.000020 #2, done in 0.000015
Output for 5.0.5
#1, done in 0.000035 #2, done in 0.000030
Output for 5.0.4
#1, done in 0.000035 #2, done in 0.000032
Output for 5.0.3
#1, done in 0.000031 #2, done in 0.000029
Output for 5.0.2
#1, done in 0.000024 #2, done in 0.000021
Output for 5.0.1
#1, done in 0.000037 #2, done in 0.000035
Output for 5.0.0
#1, done in 0.000033 #2, done in 0.000030
Output for 4.4.9
#1, done in 0.000019 #2, done in 0.000014
Output for 4.4.8
#1, done in 0.000050 #2, done in 0.000039
Output for 4.4.7
#1, done in 0.000025 #2, done in 0.000018
Output for 4.4.6
#1, done in 0.000044 #2, done in 0.000031
Output for 4.4.5
#1, done in 0.000051 #2, done in 0.000049
Output for 4.4.4
#1, done in 0.000026 #2, done in 0.000018
Output for 4.4.3
#1, done in 0.000023 #2, done in 0.000019
Output for 4.4.2
#1, done in 0.000050 #2, done in 0.000035
Output for 4.4.1
#1, done in 0.000043 #2, done in 0.000033
Output for 4.4.0
#1, done in 0.000042 #2, done in 0.000032
Output for 4.3.11
#1, done in 0.000038 #2, done in 0.000030
Output for 4.3.10
#1, done in 0.000046 #2, done in 0.000030
Output for 4.3.9
#1, done in 0.000042 #2, done in 0.000038
Output for 4.3.8
#1, done in 0.000036 #2, done in 0.000022
Output for 4.3.7
#1, done in 0.000045 #2, done in 0.000030
Output for 4.3.6
#1, done in 0.000030 #2, done in 0.000019
Output for 4.3.5
#1, done in 0.000037 #2, done in 0.000024
Output for 4.3.4
#1, done in 0.000031 #2, done in 0.000018
Output for 4.3.3
#1, done in 0.000055 #2, done in 0.000040
Output for 4.3.2
#1, done in 0.000045 #2, done in 0.000032
Output for 4.3.1
#1, done in 0.000047 #2, done in 0.000032
Output for 4.3.0
#1, done in 0.000036 #2, done in 0.000031