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 5.4.8, 5.4.14, 5.4.19, 5.6.0, 7.1.0
2.6941299438477E-5 9.5367431640625E-7
Output for 5.4.0, 7.0.14
2.5033950805664E-5 9.5367431640625E-7
Output for 7.0.10
1.9073486328125E-5 9.5367431640625E-7
Output for 7.0.9
2.0980834960938E-5 0
Output for 5.6.24, 7.0.8
2.0980834960938E-5 1.1920928955078E-6
Output for 5.4.23, 5.5.4, 5.5.6, 5.5.18, 7.0.1, 7.0.7
3.1948089599609E-5 9.5367431640625E-7
Output for 5.5.21, 5.6.7, 7.0.6
2.8848648071289E-5 9.5367431640625E-7
Output for 7.0.4 - 7.0.5
2.7894973754883E-5 9.5367431640625E-7
Output for 5.5.25, 7.0.3
2.7894973754883E-5 1.1920928955078E-6
Output for 5.5.20, 7.0.2
2.9802322387695E-5 1.1920928955078E-6
Output for 7.0.0
3.0040740966797E-5 0
Output for 5.6.28
2.8133392333984E-5 2.1457672119141E-6
Output for 5.5.31, 5.6.23, 5.6.25
2.4080276489258E-5 9.5367431640625E-7
Output for 5.5.15, 5.5.30, 5.6.6, 5.6.22
3.0040740966797E-5 1.9073486328125E-6
Output for 5.4.18, 5.6.21
3.2901763916016E-5 1.1920928955078E-6
Output for 5.3.16, 5.4.4, 5.4.31, 5.5.0, 5.5.14, 5.6.20
3.0040740966797E-5 2.1457672119141E-6
Output for 5.2.15, 5.3.11, 5.3.22, 5.3.28 - 5.3.29, 5.5.3, 5.5.23, 5.6.8, 5.6.19
3.0994415283203E-5 1.9073486328125E-6
Output for 5.6.18
2.0980834960938E-5 9.5367431640625E-7
Output for 5.3.24, 5.4.38, 5.5.13, 5.6.17
3.0994415283203E-5 2.1457672119141E-6
Output for 5.4.7, 5.4.41, 5.5.2, 5.6.16
3.0994415283203E-5 9.5367431640625E-7
Output for 5.4.5, 5.6.15
3.4093856811523E-5 9.5367431640625E-7
Output for 5.2.5, 5.3.25, 5.5.22, 5.6.14
2.8133392333984E-5 1.9073486328125E-6
Output for 5.6.13
2.8848648071289E-5 1.1920928955078E-6
Output for 5.4.22, 5.5.27, 5.6.12
3.0040740966797E-5 9.5367431640625E-7
Output for 5.6.11
2.9802322387695E-5 9.5367431640625E-7
Output for 5.4.2, 5.6.10
2.1934509277344E-5 9.5367431640625E-7
Output for 5.6.9
2.4080276489258E-5 2.1457672119141E-6
Output for 5.4.3, 5.6.5
3.2901763916016E-5 9.5367431640625E-7
Output for 5.4.11, 5.6.4
2.7894973754883E-5 2.1457672119141E-6
Output for 5.4.29, 5.4.44, 5.6.3
2.9087066650391E-5 9.5367431640625E-7
Output for 5.6.2
2.6941299438477E-5 2.1457672119141E-6
Output for 5.3.15, 5.4.21, 5.4.40, 5.6.1
3.1948089599609E-5 2.1457672119141E-6
Output for 5.3.18, 5.4.39, 5.5.38
2.8133392333984E-5 9.5367431640625E-7
Output for 5.5.37
4.1961669921875E-5 2.1457672119141E-6
Output for 5.5.36
2.5033950805664E-5 2.1457672119141E-6
Output for 5.5.35
3.1232833862305E-5 9.5367431640625E-7
Output for 5.3.4, 5.3.6, 5.5.34
3.2901763916016E-5 2.1457672119141E-6
Output for 5.3.27, 5.4.24, 5.4.34, 5.5.12, 5.5.33
2.598762512207E-5 9.5367431640625E-7
Output for 5.3.21, 5.4.20, 5.5.32
2.9087066650391E-5 1.9073486328125E-6
Output for 5.4.30, 5.4.35, 5.5.29
2.7179718017578E-5 9.5367431640625E-7
Output for 5.5.28
2.7179718017578E-5 2.1457672119141E-6
Output for 5.5.26
2.3126602172852E-5 1.9073486328125E-6
Output for 5.5.24
3.6954879760742E-5 2.1457672119141E-6
Output for 5.3.13, 5.4.25, 5.5.19
3.6954879760742E-5 1.9073486328125E-6
Output for 5.2.6, 5.2.17, 5.5.16
3.3140182495117E-5 2.1457672119141E-6
Output for 5.4.13, 5.5.11
3.2186508178711E-5 1.9073486328125E-6
Output for 5.3.0, 5.5.10
2.9087066650391E-5 2.1457672119141E-6
Output for 5.3.3, 5.4.36, 5.5.9
3.2901763916016E-5 1.9073486328125E-6
Output for 5.5.8
3.4809112548828E-5 1.9073486328125E-6
Output for 5.3.2, 5.5.7
3.4093856811523E-5 1.9073486328125E-6
Output for 5.5.5
2.3841857910156E-5 1.9073486328125E-6
Output for 5.5.1
2.1934509277344E-5 1.1920928955078E-6
Output for 5.4.45
3.4093856811523E-5 2.1457672119141E-6
Output for 5.3.23, 5.4.16, 5.4.27, 5.4.43
3.1948089599609E-5 1.9073486328125E-6
Output for 5.4.42
3.0040740966797E-5 1.1920928955078E-6
Output for 5.4.37
3.504753112793E-5 1.9073486328125E-6
Output for 5.3.14, 5.3.20, 5.3.26, 5.4.32
2.8848648071289E-5 1.9073486328125E-6
Output for 5.4.28
2.288818359375E-5 1.1920928955078E-6
Output for 5.4.26
3.504753112793E-5 9.5367431640625E-7
Output for 5.4.17
2.7894973754883E-5 1.9073486328125E-6
Output for 5.3.19, 5.4.15
3.2186508178711E-5 2.1457672119141E-6
Output for 5.4.12
2.4795532226562E-5 9.5367431640625E-7
Output for 5.4.10
3.0994415283203E-5 1.1920928955078E-6
Output for 5.4.9
3.7908554077148E-5 9.5367431640625E-7
Output for 5.2.3, 5.4.6
2.9802322387695E-5 2.1457672119141E-6
Output for 5.4.1
3.1948089599609E-5 1.1920928955078E-6
Output for 5.3.17
2.6941299438477E-5 1.9073486328125E-6
Output for 5.3.12
2.5033950805664E-5 1.9073486328125E-6
Output for 5.2.7, 5.3.10
3.3140182495117E-5 1.9073486328125E-6
Output for 5.3.9
3.504753112793E-5 2.1457672119141E-6
Output for 5.3.8
2.8133392333984E-5 2.8610229492188E-6
Output for 5.3.7
3.3855438232422E-5 1.9073486328125E-6
Output for 5.3.5
2.598762512207E-5 1.9073486328125E-6
Output for 5.3.1
3.9100646972656E-5 2.1457672119141E-6
Output for 5.2.16
3.814697265625E-5 1.9073486328125E-6
Output for 5.2.14
2.4795532226562E-5 2.1457672119141E-6
Output for 5.2.13
2.9802322387695E-5 1.9073486328125E-6
Output for 5.2.12
3.0040740966797E-5 3.0994415283203E-6
Output for 5.2.11
3.1948089599609E-5 3.0994415283203E-6
Output for 5.2.10
2.288818359375E-5 9.5367431640625E-7
Output for 5.2.9
3.6954879760742E-5 4.0531158447266E-6
Output for 5.2.8
3.3855438232422E-5 3.0994415283203E-6
Output for 5.2.4
2.9087066650391E-5 2.8610229492188E-6
Output for 5.2.2
2.7894973754883E-5 3.0994415283203E-6
Output for 5.1.6, 5.2.1
3.0994415283203E-05 3.0994415283203E-06
Output for 5.2.0
2.5033950805664E-05 3.0994415283203E-06
Output for 5.1.5
3.6954879760742E-05 2.8610229492188E-06
Output for 5.1.4
3.1948089599609E-05 3.814697265625E-06
Output for 5.1.3
3.6001205444336E-05 3.0994415283203E-06
Output for 5.1.2
3.9815902709961E-05 2.8610229492188E-06
Output for 5.1.1
2.8848648071289E-05 1.9073486328125E-06
Output for 5.1.0
3.3855438232422E-05 2.8610229492188E-06
Output for 5.0.5
3.2901763916016E-05 3.814697265625E-06
Output for 5.0.4
3.6954879760742E-05 5.0067901611328E-06
Output for 5.0.3
3.4093856811523E-05 4.0531158447266E-06
Output for 5.0.2
3.8862228393555E-05 5.9604644775391E-06
Output for 5.0.1
3.4093856811523E-05 5.9604644775391E-06
Output for 5.0.0
2.7179718017578E-05 1.9073486328125E-06
Output for 4.4.9
3.9E-05 7E-06
Output for 4.4.8
3.8E-05 5E-06
Output for 4.4.7
4.3E-05 6E-06
Output for 4.4.6
3.3E-05 4E-06
Output for 4.3.10, 4.4.5
4.2E-05 5E-06
Output for 4.4.4
3.5E-05 5E-06
Output for 4.4.3
4.8E-05 6E-06
Output for 4.4.2
4.9E-05 5E-06
Output for 4.4.1
3.9E-05 5E-06
Output for 4.4.0
4E-05 8E-06
Output for 4.3.11
4.1E-05 8E-06
Output for 4.3.9
3.3E-05 3E-06
Output for 4.3.8
5.7E-05 7E-06
Output for 4.3.7
5.2E-05 8E-06
Output for 4.3.6
4.6E-05 5E-06
Output for 4.3.5
5.5E-05 6E-06
Output for 4.3.2, 4.3.4
5E-05 6E-06
Output for 4.3.3
5E-05 8E-06
Output for 4.3.1
5.6E-05 7E-06
Output for 4.3.0
5.1E-05 6E-06