3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = 129; $y = 1; $m = microtime(true); $y = 1 << ceil(log($x, 2)); $e = microtime(true); echo ($e - $m), "\n\r"; $y = 1; $m = microtime(true); while ($y < $x) { $y = $y <<1; } echo microtime(true) - $m;
Output for 7.1.7
1.6927719116211E-5 3.0994415283203E-6
Output for 7.1.6
3.6954879760742E-5 5.9604644775391E-6
Output for 7.1.5
3.3855438232422E-5 7.8678131103516E-6
Output for 5.4.4 - 5.4.5, 5.4.16, 5.5.8, 5.5.19, 5.6.24, 5.6.28, 7.0.20 - 7.1.0
2.4080276489258E-5 9.5367431640625E-7
Output for 5.3.2, 5.3.16, 5.3.20, 5.3.26, 5.4.0, 5.4.7, 5.5.12, 5.5.16, 5.5.35, 7.0.14
2.5033950805664E-5 9.5367431640625E-7
Output for 7.0.10
2.3841857910156E-5 9.5367431640625E-7
Output for 5.4.6, 5.4.20, 5.5.2, 5.5.4 - 5.5.5, 5.5.28, 7.0.9
2.3126602172852E-5 9.5367431640625E-7
Output for 7.0.8
3.3855438232422E-5 9.5367431640625E-7
Output for 7.0.0, 7.0.5, 7.0.7
2.5033950805664E-5 0
Output for 5.3.28, 5.4.31, 5.5.23, 7.0.6
2.2172927856445E-5 9.5367431640625E-7
Output for 7.0.4
3.4809112548828E-5 9.5367431640625E-7
Output for 7.0.3
3.0994415283203E-5 9.5367431640625E-7
Output for 5.4.35, 5.6.2, 7.0.2
2.6941299438477E-5 9.5367431640625E-7
Output for 7.0.1
3.6001205444336E-5 0
Output for 5.5.18, 5.6.25
4.2915344238281E-5 1.9073486328125E-6
Output for 5.6.22 - 5.6.23
4.0054321289062E-5 1.9073486328125E-6
Output for 5.4.44, 5.6.3, 5.6.12, 5.6.21
2.5033950805664E-5 1.1920928955078E-6
Output for 5.6.20
4.6014785766602E-5 2.1457672119141E-6
Output for 5.6.19
3.2901763916016E-5 1.9073486328125E-6
Output for 5.6.18
2.4080276489258E-5 1.1920928955078E-6
Output for 5.6.17
3.4809112548828E-5 2.1457672119141E-6
Output for 5.3.13, 5.6.16
2.598762512207E-5 1.9073486328125E-6
Output for 5.4.17, 5.4.43, 5.6.9, 5.6.15
2.8848648071289E-5 9.5367431640625E-7
Output for 5.6.14
2.3841857910156E-5 1.1920928955078E-6
Output for 5.6.13
8.1062316894531E-5 9.5367431640625E-7
Output for 5.3.15, 5.4.28, 5.4.34, 5.6.11
2.9087066650391E-5 9.5367431640625E-7
Output for 5.6.10
3.0040740966797E-5 2.1457672119141E-6
Output for 5.5.26, 5.6.8
3.6001205444336E-5 9.5367431640625E-7
Output for 5.6.7
2.5033950805664E-5 1.9073486328125E-6
Output for 5.6.6
3.6954879760742E-5 9.5367431640625E-7
Output for 5.6.5
3.504753112793E-5 9.5367431640625E-7
Output for 5.6.4
3.1948089599609E-5 2.1457672119141E-6
Output for 5.3.1, 5.4.11, 5.4.14, 5.6.1
2.3126602172852E-5 1.1920928955078E-6
Output for 5.4.45, 5.6.0
2.7894973754883E-5 9.5367431640625E-7
Output for 5.5.38
3.8862228393555E-5 1.9073486328125E-6
Output for 5.5.37
3.4093856811523E-5 1.9073486328125E-6
Output for 5.5.36
2.288818359375E-5 1.1920928955078E-6
Output for 5.5.34
2.8133392333984E-5 1.9073486328125E-6
Output for 5.5.33
3.9100646972656E-5 1.9073486328125E-6
Output for 5.5.32
3.9815902709961E-5 1.9073486328125E-6
Output for 5.5.31
3.1948089599609E-5 1.3113021850586E-5
Output for 5.5.30
2.8848648071289E-5 2.1457672119141E-6
Output for 5.4.18, 5.5.29
2.1934509277344E-5 1.1920928955078E-6
Output for 5.2.5, 5.3.17, 5.5.27
2.6941299438477E-5 1.9073486328125E-6
Output for 5.5.25
3.2186508178711E-5 1.9073486328125E-6
Output for 5.4.37, 5.4.39, 5.5.24
3.3140182495117E-5 1.9073486328125E-6
Output for 5.4.32, 5.5.22
3.0040740966797E-5 9.5367431640625E-7
Output for 5.4.12, 5.5.21
2.598762512207E-5 9.5367431640625E-7
Output for 5.5.20
3.0994415283203E-5 1.9073486328125E-6
Output for 5.3.22, 5.4.8, 5.5.15
2.1934509277344E-5 9.5367431640625E-7
Output for 5.5.14
2.9087066650391E-5 2.1457672119141E-6
Output for 5.2.13, 5.3.3, 5.3.6, 5.3.8, 5.3.14, 5.4.3, 5.5.6, 5.5.10, 5.5.13
2.0980834960938E-5 9.5367431640625E-7
Output for 5.5.11
1.978874206543E-5 0
Output for 5.2.16, 5.5.9
2.0027160644531E-5 1.9073486328125E-6
Output for 5.5.7
2.0980834960938E-5 1.1920928955078E-6
Output for 5.4.2, 5.5.3
2.0027160644531E-5 0
Output for 5.3.5, 5.3.7, 5.3.10 - 5.3.11, 5.4.9, 5.4.19, 5.4.24 - 5.4.25, 5.5.1
2.0027160644531E-5 9.5367431640625E-7
Output for 5.5.0
5.0067901611328E-5 2.1457672119141E-6
Output for 5.4.42
2.8133392333984E-5 1.1920928955078E-6
Output for 5.4.41
3.1948089599609E-5 1.1920928955078E-6
Output for 5.4.40
4.0054321289062E-5 1.1920928955078E-6
Output for 5.4.38
3.3140182495117E-5 2.1457672119141E-6
Output for 5.4.36
3.3855438232422E-5 1.1920928955078E-6
Output for 5.4.30
3.0040740966797E-5 1.9073486328125E-6
Output for 5.4.29
2.4795532226562E-5 1.1920928955078E-6
Output for 5.4.22, 5.4.27
2.288818359375E-5 9.5367431640625E-7
Output for 5.4.26
2.2172927856445E-5 1.9073486328125E-6
Output for 5.4.23
1.978874206543E-5 1.1920928955078E-6
Output for 5.4.21
1.978874206543E-5 9.5367431640625E-7
Output for 5.4.15
1.8835067749023E-5 9.5367431640625E-7
Output for 5.4.13
2.0980834960938E-5 0
Output for 5.4.10
2.1219253540039E-5 0
Output for 5.4.1
2.3841857910156E-5 2.1457672119141E-6
Output for 5.3.29
3.6001205444336E-5 1.9073486328125E-6
Output for 5.3.27
1.8119812011719E-5 9.5367431640625E-7
Output for 5.2.8, 5.3.25
2.0027160644531E-5 2.1457672119141E-6
Output for 5.2.14, 5.3.24
1.9073486328125E-5 9.5367431640625E-7
Output for 5.3.23
2.1219253540039E-5 2.1457672119141E-6
Output for 5.3.21
2.1219253540039E-5 9.5367431640625E-7
Output for 5.2.7, 5.3.19
2.0980834960938E-5 1.9073486328125E-6
Output for 5.3.18
2.0980834960938E-5 2.1457672119141E-6
Output for 5.3.12
2.4080276489258E-5 1.9073486328125E-6
Output for 5.3.9
1.7881393432617E-5 1.9073486328125E-6
Output for 5.3.4
2.7894973754883E-5 1.9073486328125E-6
Output for 5.3.0
2.5033950805664E-5 2.1457672119141E-6
Output for 5.2.17
2.4080276489258E-5 3.0994415283203E-6
Output for 5.2.15
2.598762512207E-5 2.8610229492188E-6
Output for 5.2.12
2.288818359375E-5 1.9073486328125E-6
Output for 5.2.11
1.8835067749023E-5 2.1457672119141E-6
Output for 5.2.10
2.3126602172852E-5 3.0994415283203E-6
Output for 5.2.9
2.3126602172852E-5 1.9073486328125E-6
Output for 5.2.6
2.598762512207E-5 2.1457672119141E-6
Output for 5.2.4
3.3855438232422E-5 2.8610229492188E-6
Output for 5.2.3
2.1934509277344E-5 1.9073486328125E-6
Output for 5.2.2
3.1948089599609E-5 1.9073486328125E-6
Output for 5.0.3, 5.2.1
2.9087066650391E-05 2.8610229492188E-06
Output for 5.2.0
2.8133392333984E-05 3.0994415283203E-06
Output for 5.1.6
3.6001205444336E-05 1.9073486328125E-06
Output for 5.1.5
2.5033950805664E-05 2.1457672119141E-06
Output for 5.1.4
2.4080276489258E-05 9.5367431640625E-07
Output for 5.1.3
3.4093856811523E-05 3.0994415283203E-06
Output for 5.1.2
3.8862228393555E-05 2.8610229492188E-06
Output for 5.1.1
2.598762512207E-05 3.0994415283203E-06
Output for 5.1.0
2.5033950805664E-05 1.9073486328125E-06
Output for 5.0.5
2.7894973754883E-05 5.0067901611328E-06
Output for 5.0.4
2.598762512207E-05 2.8610229492188E-06
Output for 5.0.2
2.6941299438477E-05 2.8610229492188E-06
Output for 5.0.1
3.6001205444336E-05 4.0531158447266E-06
Output for 5.0.0
3.0994415283203E-05 5.0067901611328E-06
Output for 4.4.9
3.1E-05 4E-06
Output for 4.4.8
2.8E-05 3E-06
Output for 4.4.7
3.5E-05 5E-06
Output for 4.4.6
2.6E-05 3E-06
Output for 4.4.5
2.1E-05 2E-06
Output for 4.4.4
3E-05 3E-06
Output for 4.4.3
4E-05 3E-06
Output for 4.4.2
3.3E-05 3E-06
Output for 4.4.1
4.2E-05 6E-06
Output for 4.4.0
4.4E-05 5E-06
Output for 4.3.11
3.5E-05 4E-06
Output for 4.3.10
3.3E-05 4E-06
Output for 4.3.9
5.3E-05 7E-06
Output for 4.3.8
4.3E-05 4E-06
Output for 4.3.7
4.5E-05 8E-06
Output for 4.3.6
5.2E-05 7E-06
Output for 4.3.5
5.6E-05 9E-06
Output for 4.3.4
4.2E-05 5E-06
Output for 4.3.3
6.1E-05 6E-06
Output for 4.3.2
4.2E-05 4E-06
Output for 4.3.1
6.3E-05 9E-06
Output for 4.3.0
5.6E-05 6E-06