3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $x = 129; $y = 1; $m = microtime(true); $y = 1 << ceil(log($x, 2)); echo (microtime(true) - $m), "\n\r"; $y = 1; $m = microtime(true); while ($y < $x) { $y = $y <<1; } echo microtime(true) - $m;
Output for 5.4.18, 7.1.0
2.0980834960938E-5 9.5367431640625E-7
Output for 7.0.14
2.3126602172852E-5 9.5367431640625E-7
Output for 5.4.12, 5.5.30, 5.5.33, 5.6.0, 7.0.7
2.6941299438477E-5 9.5367431640625E-7
Output for 5.3.16, 5.5.34, 7.0.6
2.8133392333984E-5 9.5367431640625E-7
Output for 5.6.4, 7.0.5
3.2901763916016E-5 9.5367431640625E-7
Output for 5.5.4, 5.5.20, 7.0.4
3.1948089599609E-5 9.5367431640625E-7
Output for 5.3.22, 5.6.19, 7.0.3
2.9087066650391E-5 2.1457672119141E-6
Output for 7.0.2
2.5033950805664E-5 0
Output for 7.0.1
3.4093856811523E-5 0
Output for 7.0.0
2.8133392333984E-5 2.1457672119141E-6
Output for 5.4.26, 5.5.15, 5.5.32, 5.6.28
2.8848648071289E-5 9.5367431640625E-7
Output for 5.5.13, 5.6.22
3.2901763916016E-5 1.9073486328125E-6
Output for 5.6.21
2.4795532226562E-5 9.5367431640625E-7
Output for 5.4.34, 5.6.20
3.504753112793E-5 1.1920928955078E-6
Output for 5.4.8, 5.5.2, 5.6.18
2.7894973754883E-5 9.5367431640625E-7
Output for 5.6.17
3.0040740966797E-5 1.9073486328125E-6
Output for 5.3.24, 5.4.0, 5.4.19, 5.5.3, 5.6.13, 5.6.16
3.0994415283203E-5 9.5367431640625E-7
Output for 5.3.27, 5.4.10, 5.6.15
2.598762512207E-5 2.1457672119141E-6
Output for 5.3.14, 5.4.16, 5.4.23, 5.6.14
2.288818359375E-5 9.5367431640625E-7
Output for 5.6.12
2.7179718017578E-5 1.1920928955078E-6
Output for 5.6.11
2.6941299438477E-5 2.1457672119141E-6
Output for 5.4.1, 5.4.15, 5.4.27, 5.4.42, 5.5.26, 5.6.10
3.0040740966797E-5 9.5367431640625E-7
Output for 5.6.9
3.6001205444336E-5 2.1457672119141E-6
Output for 5.3.5, 5.3.7, 5.3.26, 5.5.5, 5.5.21, 5.6.8
3.0994415283203E-5 1.9073486328125E-6
Output for 5.4.39, 5.6.7
2.1934509277344E-5 9.5367431640625E-7
Output for 5.6.6
2.8848648071289E-5 2.1457672119141E-6
Output for 5.3.21, 5.3.23, 5.6.5
2.9802322387695E-5 1.9073486328125E-6
Output for 5.6.3
2.288818359375E-5 1.1920928955078E-6
Output for 5.6.2
3.4093856811523E-5 2.1457672119141E-6
Output for 5.5.28, 5.6.1
2.9087066650391E-5 9.5367431640625E-7
Output for 5.4.29, 5.5.36
3.0040740966797E-5 2.1457672119141E-6
Output for 5.5.35
3.2186508178711E-5 1.9073486328125E-6
Output for 5.3.15, 5.4.21, 5.4.45, 5.5.12, 5.5.19, 5.5.24, 5.5.31
2.4080276489258E-5 9.5367431640625E-7
Output for 5.4.5, 5.5.29
2.5033950805664E-5 9.5367431640625E-7
Output for 5.5.27
2.3841857910156E-5 1.1920928955078E-6
Output for 5.4.2, 5.4.30, 5.4.35, 5.5.9, 5.5.14, 5.5.25
3.0994415283203E-5 1.1920928955078E-6
Output for 5.2.3, 5.5.23
2.3126602172852E-5 1.9073486328125E-6
Output for 5.3.12, 5.4.20, 5.4.25, 5.5.22
2.8133392333984E-5 1.9073486328125E-6
Output for 5.4.6, 5.4.28, 5.5.18
2.598762512207E-5 9.5367431640625E-7
Output for 5.5.16
3.6954879760742E-5 1.1920928955078E-6
Output for 5.4.24, 5.5.11
2.4080276489258E-5 1.1920928955078E-6
Output for 5.2.6, 5.5.10
2.598762512207E-5 1.9073486328125E-6
Output for 5.3.20, 5.5.1, 5.5.8
3.0994415283203E-5 2.1457672119141E-6
Output for 5.5.7
3.504753112793E-5 1.9073486328125E-6
Output for 5.5.6
2.9087066650391E-5 1.9073486328125E-6
Output for 5.3.10, 5.3.13, 5.4.17, 5.5.0
3.1948089599609E-5 1.9073486328125E-6
Output for 5.4.44
3.3855438232422E-5 9.5367431640625E-7
Output for 5.4.43
3.2901763916016E-5 1.1920928955078E-6
Output for 5.3.17, 5.4.41
3.3140182495117E-5 2.1457672119141E-6
Output for 5.4.40
2.2172927856445E-5 1.9073486328125E-6
Output for 5.4.38
2.2172927856445E-5 9.5367431640625E-7
Output for 5.4.37
3.3855438232422E-5 1.9073486328125E-6
Output for 5.3.19, 5.4.36
2.6941299438477E-5 1.9073486328125E-6
Output for 5.4.32
3.1948089599609E-5 2.1457672119141E-6
Output for 5.4.31
3.3140182495117E-5 1.9073486328125E-6
Output for 5.3.1, 5.4.22
3.504753112793E-5 9.5367431640625E-7
Output for 5.4.14
2.598762512207E-5 1.1920928955078E-6
Output for 5.4.13
3.6001205444336E-5 1.1920928955078E-6
Output for 5.4.11
3.6001205444336E-5 9.5367431640625E-7
Output for 5.4.9
4.4107437133789E-5 2.1457672119141E-6
Output for 5.4.7
3.0040740966797E-5 1.1920928955078E-6
Output for 5.4.4
2.288818359375E-5 0
Output for 5.4.3
3.1948089599609E-5 1.1920928955078E-6
Output for 5.3.29
2.8133392333984E-5 1.1920928955078E-6
Output for 5.3.28
4.1961669921875E-5 3.0994415283203E-6
Output for 5.3.25
3.2186508178711E-5 2.1457672119141E-6
Output for 5.3.18
3.3140182495117E-5 2.8610229492188E-6
Output for 5.3.11
3.8862228393555E-5 3.0994415283203E-6
Output for 5.3.9
2.7894973754883E-5 2.1457672119141E-6
Output for 5.3.8
2.9802322387695E-5 9.5367431640625E-7
Output for 5.3.6
2.9087066650391E-5 1.1920928955078E-6
Output for 5.3.4
3.4093856811523E-5 1.9073486328125E-6
Output for 5.3.3
2.4080276489258E-5 1.9073486328125E-6
Output for 5.2.7, 5.2.9, 5.3.0, 5.3.2
2.0980834960938E-5 2.1457672119141E-6
Output for 5.2.17
3.504753112793E-5 2.1457672119141E-6
Output for 5.2.16
3.0994415283203E-5 3.0994415283203E-6
Output for 5.2.15
3.2901763916016E-5 3.0994415283203E-6
Output for 5.2.14
2.288818359375E-5 2.8610229492188E-6
Output for 5.2.10, 5.2.13
2.0027160644531E-5 2.1457672119141E-6
Output for 5.2.2, 5.2.12
1.978874206543E-5 1.9073486328125E-6
Output for 5.2.11
2.598762512207E-5 2.8610229492188E-6
Output for 5.2.8
2.0027160644531E-5 2.8610229492188E-6
Output for 5.2.5
2.3126602172852E-5 2.1457672119141E-6
Output for 5.2.4
2.0027160644531E-5 1.9073486328125E-6
Output for 5.2.1
2.0027160644531E-05 2.1457672119141E-06
Output for 5.2.0
2.9087066650391E-05 3.0994415283203E-06
Output for 5.1.6
2.598762512207E-05 9.5367431640625E-07
Output for 5.1.5
3.0994415283203E-05 1.9073486328125E-06
Output for 5.1.4
3.4093856811523E-05 2.8610229492188E-06
Output for 5.1.3
2.3126602172852E-05 3.0994415283203E-06
Output for 5.0.1, 5.1.2
2.0027160644531E-05 1.9073486328125E-06
Output for 5.1.1
2.0980834960938E-05 9.5367431640625E-07
Output for 5.1.0
2.0980834960938E-05 1.9073486328125E-06
Output for 5.0.5
3.504753112793E-05 3.814697265625E-06
Output for 5.0.4
2.7894973754883E-05 4.0531158447266E-06
Output for 5.0.3
1.978874206543E-05 4.0531158447266E-06
Output for 5.0.2
2.1934509277344E-05 3.0994415283203E-06
Output for 5.0.0
1.9073486328125E-05 1.9073486328125E-06
Output for 4.3.10, 4.4.1, 4.4.9
2.4E-05 3E-06
Output for 4.4.8
2.3E-05 3E-06
Output for 4.4.7
2.2E-05 3E-06
Output for 4.4.6
3.6E-05 5E-06
Output for 4.4.5
3E-05 5E-06
Output for 4.4.4
4E-05 4E-06
Output for 4.3.7, 4.3.9, 4.4.3
3E-05 3E-06
Output for 4.4.0, 4.4.2
2.6E-05 3E-06
Output for 4.3.11
2.5E-05 3E-06
Output for 4.3.8
4.4E-05 4E-06
Output for 4.3.6
3.3E-05 3E-06
Output for 4.3.5
3.8E-05 3E-06
Output for 4.3.4
3.1E-05 5E-06
Output for 4.3.3
2.8E-05 4E-06
Output for 4.3.2
4.7E-05 5E-06
Output for 4.3.0 - 4.3.1
3.4E-05 3E-06