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 ($m - microtime(true)), "\n\r"; $y = 1; $m = microtime(true); while ($y < $x) { $y = $y <<1; } echo microtime(true) - $m;
Output for 5.5.5, 5.5.12, 5.5.25, 5.6.10, 7.0.2, 7.1.0
-2.598762512207E-5 9.5367431640625E-7
Output for 7.0.14
-2.288818359375E-5 0
Output for 7.0.10
-2.5033950805664E-5 0
Output for 7.0.9
-1.7881393432617E-5 9.5367431640625E-7
Output for 5.6.21, 7.0.8
-2.0980834960938E-5 9.5367431640625E-7
Output for 5.5.36, 7.0.7
-1.8835067749023E-5 9.5367431640625E-7
Output for 7.0.6
-1.978874206543E-5 9.5367431640625E-7
Output for 7.0.5
-2.0980834960938E-5 0
Output for 5.4.0, 5.4.2, 5.4.32, 5.5.10, 5.5.19, 5.6.12, 7.0.4
-3.0040740966797E-5 9.5367431640625E-7
Output for 7.0.3
-2.9087066650391E-5 0
Output for 7.0.1
-2.5033950805664E-5 1.1920928955078E-6
Output for 7.0.0
-2.288818359375E-5 1.1920928955078E-6
Output for 5.3.1, 5.3.17, 5.6.28
-2.8133392333984E-5 9.5367431640625E-7
Output for 5.3.10, 5.3.23, 5.5.34, 5.6.25
-2.1934509277344E-5 9.5367431640625E-7
Output for 5.6.24
-2.5033950805664E-5 2.1457672119141E-6
Output for 5.5.33, 5.6.19, 5.6.23
-2.0027160644531E-5 9.5367431640625E-7
Output for 5.6.22
-2.3126602172852E-5 1.1920928955078E-6
Output for 5.6.20
-2.6226043701172E-5 9.5367431640625E-7
Output for 5.5.18, 5.6.18
-2.2172927856445E-5 9.5367431640625E-7
Output for 5.6.17
-4.2915344238281E-5 9.5367431640625E-7
Output for 5.6.16
-2.288818359375E-5 1.9073486328125E-6
Output for 5.3.16, 5.6.15
-2.9087066650391E-5 1.9073486328125E-6
Output for 5.6.14
-2.5033950805664E-5 9.5367431640625E-7
Output for 5.4.11, 5.4.17, 5.6.13
-2.9087066650391E-5 1.1920928955078E-6
Output for 5.6.11
-2.7894973754883E-5 1.1920928955078E-6
Output for 5.3.29, 5.4.36, 5.4.42, 5.6.9
-3.0994415283203E-5 9.5367431640625E-7
Output for 5.3.6, 5.4.22, 5.6.8
-3.0040740966797E-5 1.9073486328125E-6
Output for 5.3.5, 5.4.6, 5.5.1, 5.5.20, 5.6.2, 5.6.7
-3.0994415283203E-5 2.1457672119141E-6
Output for 5.3.26, 5.4.18, 5.4.23, 5.6.0, 5.6.6
-2.7894973754883E-5 9.5367431640625E-7
Output for 5.3.13, 5.6.5
-3.6001205444336E-5 1.9073486328125E-6
Output for 5.3.22, 5.6.4
-2.9802322387695E-5 1.9073486328125E-6
Output for 5.5.13, 5.6.3
-2.7894973754883E-5 2.1457672119141E-6
Output for 5.4.8, 5.4.15, 5.4.24, 5.4.27, 5.6.1
-3.1948089599609E-5 9.5367431640625E-7
Output for 5.5.38
-2.288818359375E-5 9.5367431640625E-7
Output for 5.5.37
-1.9073486328125E-5 9.5367431640625E-7
Output for 5.5.35
-2.0980834960938E-5 1.9073486328125E-6
Output for 5.5.32
-2.3126602172852E-5 1.9073486328125E-6
Output for 5.4.20, 5.5.31
-3.0994415283203E-5 1.1920928955078E-6
Output for 5.3.8, 5.4.1, 5.5.30
-2.7894973754883E-5 1.9073486328125E-6
Output for 5.5.29
-4.3153762817383E-5 9.5367431640625E-7
Output for 5.3.2, 5.5.28
-2.8848648071289E-5 1.9073486328125E-6
Output for 5.4.9, 5.5.27
-2.8848648071289E-5 9.5367431640625E-7
Output for 5.4.39, 5.5.22, 5.5.26
-3.2901763916016E-5 9.5367431640625E-7
Output for 5.4.3, 5.5.24
-3.3140182495117E-5 9.5367431640625E-7
Output for 5.4.10, 5.4.25, 5.4.45, 5.5.8, 5.5.23
-3.0040740966797E-5 2.1457672119141E-6
Output for 5.3.3, 5.5.2, 5.5.21
-2.9087066650391E-5 9.5367431640625E-7
Output for 5.3.14, 5.5.6, 5.5.16
-2.3126602172852E-5 9.5367431640625E-7
Output for 5.5.3, 5.5.15
-2.6941299438477E-5 2.1457672119141E-6
Output for 5.2.6, 5.2.15, 5.3.0, 5.4.7, 5.5.14
-3.1948089599609E-5 1.9073486328125E-6
Output for 5.4.28, 5.5.11
-3.4093856811523E-5 9.5367431640625E-7
Output for 5.4.26, 5.5.9
-3.504753112793E-5 2.1457672119141E-6
Output for 5.5.7
-3.4093856811523E-5 2.1457672119141E-6
Output for 5.5.4
-2.4080276489258E-5 1.1920928955078E-6
Output for 5.5.0
-4.6014785766602E-5 2.1457672119141E-6
Output for 5.3.18, 5.4.31, 5.4.40, 5.4.44
-3.0994415283203E-5 1.9073486328125E-6
Output for 5.4.43
-3.4093856811523E-5 1.9073486328125E-6
Output for 5.4.12, 5.4.14, 5.4.30, 5.4.41
-3.2901763916016E-5 1.9073486328125E-6
Output for 5.4.38
-3.6001205444336E-5 1.1920928955078E-6
Output for 5.4.37
-3.4809112548828E-5 9.5367431640625E-7
Output for 5.4.35
-2.6941299438477E-5 9.5367431640625E-7
Output for 5.4.34
-3.504753112793E-5 1.9073486328125E-6
Output for 5.3.7, 5.3.25, 5.4.13, 5.4.29
-3.2901763916016E-5 2.1457672119141E-6
Output for 5.4.21
-3.0040740966797E-5 1.1920928955078E-6
Output for 5.3.15, 5.4.19
-2.8848648071289E-5 2.1457672119141E-6
Output for 5.4.4, 5.4.16
-2.6941299438477E-5 1.1920928955078E-6
Output for 5.4.5
-2.9087066650391E-5 2.1457672119141E-6
Output for 5.3.4, 5.3.19, 5.3.28
-3.2186508178711E-5 1.9073486328125E-6
Output for 5.3.27
-4.0054321289062E-5 2.1457672119141E-6
Output for 5.3.24
-3.3855438232422E-5 1.9073486328125E-6
Output for 5.3.21
-3.3140182495117E-5 1.9073486328125E-6
Output for 5.3.20
-3.0040740966797E-5 2.8610229492188E-6
Output for 5.3.12
-2.8133392333984E-5 2.1457672119141E-6
Output for 5.3.11
-2.7179718017578E-5 9.5367431640625E-7
Output for 5.2.17, 5.3.9
-2.8133392333984E-5 3.0994415283203E-6
Output for 5.2.16
-3.1948089599609E-5 3.0994415283203E-6
Output for 5.2.14
-3.504753112793E-5 3.0994415283203E-6
Output for 5.2.2, 5.2.13
-3.3140182495117E-5 2.8610229492188E-6
Output for 5.2.12
-3.504753112793E-5 2.8610229492188E-6
Output for 5.2.11
-2.6941299438477E-5 1.9073486328125E-6
Output for 5.2.10
-2.7179718017578E-5 1.9073486328125E-6
Output for 5.2.9
-3.2186508178711E-5 3.0994415283203E-6
Output for 5.2.8
-3.0994415283203E-5 3.0994415283203E-6
Output for 5.2.7
-2.8133392333984E-5 2.8610229492188E-6
Output for 5.2.5
-3.7908554077148E-5 3.0994415283203E-6
Output for 5.2.4
-4.3153762817383E-5 5.0067901611328E-6
Output for 5.2.3
-3.4809112548828E-5 3.0994415283203E-6
Output for 5.1.1, 5.2.1
-3.1948089599609E-05 4.0531158447266E-06
Output for 5.2.0
-2.8848648071289E-05 2.1457672119141E-06
Output for 5.1.6
-2.9087066650391E-05 2.8610229492188E-06
Output for 5.1.5
-2.7894973754883E-05 2.1457672119141E-06
Output for 5.1.4
-3.2901763916016E-05 3.0994415283203E-06
Output for 5.1.3
-3.4093856811523E-05 3.0994415283203E-06
Output for 5.1.2
-3.504753112793E-05 2.8610229492188E-06
Output for 5.1.0
-3.504753112793E-05 3.0994415283203E-06
Output for 5.0.5
-3.504753112793E-05 5.0067901611328E-06
Output for 5.0.1, 5.0.4
-3.6001205444336E-05 4.0531158447266E-06
Output for 5.0.3
-3.3140182495117E-05 5.0067901611328E-06
Output for 5.0.2
-3.7193298339844E-05 5.0067901611328E-06
Output for 5.0.0
-3.0040740966797E-05 4.0531158447266E-06
Output for 4.4.9
-4.4E-05 6E-06
Output for 4.4.8
-3.9E-05 7E-06
Output for 4.4.1, 4.4.7
-4.2E-05 5E-06
Output for 4.4.6
-4.2E-05 6E-06
Output for 4.4.5
-4.1E-05 5E-06
Output for 4.4.4
-3.3E-05 4E-06
Output for 4.4.3
-4.7E-05 6E-06
Output for 4.4.2
-4.4E-05 5E-06
Output for 4.4.0
-4.5E-05 7E-06
Output for 4.3.11
-5.2E-05 6E-06
Output for 4.3.10
-4E-05 4E-06
Output for 4.3.9
-5.6E-05 6E-06
Output for 4.3.8
-4.7E-05 7E-06
Output for 4.3.1, 4.3.7
-5.1E-05 5E-06
Output for 4.3.6
-5E-05 6E-06
Output for 4.3.5
-4.6E-05 4E-06
Output for 4.3.4
-4.8E-05 5E-06
Output for 4.3.3
-4.7E-05 5E-06
Output for 4.3.2
-5E-05 5E-06
Output for 4.3.0
-5.1E-05 7E-06