3v4l.org

run code in 300+ PHP versions simultaneously
<?php error_reporting(0); // The original function function a($i){$e=microtime(1)+$i;while(microtime(1)<$e);} // Use 'for' instead of 'while' function b($i){for($e=microtime(1)+$i;microtime(1)<$e;);} // Extract 'microtime' into a variable function c($i){for($f=microtime,$e=$f(1)+$i;$f(1)<$e;);} //var_dump(PHP_VERSION_ID); exit(); // PHP 7 only: initialize $f on its first use //if (70000 <= PHP_VERSION_ID) { // function d($i){for($e=($f=microtime)(1)+$i;$f(1)<$e;);} //} // Test $t0 = microtime(true); a(1); $ta = microtime(true); b(1); $tb = microtime(true); //c(1); $tc = microtime(true); if (70000 <= PHP_VERSION_ID) { // d(1); } $td = microtime(true); printf("a(): %.6f\n", $ta-$t0); printf("b(): %.6f\n", $tb-$ta); printf("c(): %.6f\n", $tc-$tb); if (70000 <= PHP_VERSION_ID) { // printf("d(): %.6f\n", $td-$tc); } else { printf("d(): N/A\n"); }
Output for 7.3.8 - 7.3.9, 7.3.12, 7.4.1
a(): 1.000011 b(): 1.000003 c(): 0.000000
Output for 7.2.0, 7.2.26, 7.4.0
a(): 1.000014 b(): 1.000003 c(): 0.000001
Output for 7.3.13
a(): 1.000010 b(): 1.000003 c(): 0.000000
Output for 7.2.18, 7.3.1, 7.3.10 - 7.3.11
a(): 1.000008 b(): 1.000003 c(): 0.000001
Output for 7.1.5, 7.1.9, 7.1.15 - 7.1.16, 7.1.26, 7.3.7
a(): 1.000007 b(): 1.000003 c(): 0.000000
Output for 7.1.4, 7.2.5, 7.2.16, 7.3.6
a(): 1.000008 b(): 1.000003 c(): 0.000000
Output for 7.3.5
a(): 1.000009 b(): 1.000002 c(): 0.000000
Output for 7.3.4
a(): 1.000010 b(): 1.000004 c(): 0.000000
Output for 7.1.18, 7.1.20, 7.2.23, 7.3.0, 7.3.3
a(): 1.000008 b(): 1.000002 c(): 0.000000
Output for 7.3.2
a(): 1.000008 b(): 1.000002 c(): 0.000001
Output for 7.2.6, 7.2.25
a(): 1.000011 b(): 1.000002 c(): 0.000000
Output for 7.2.24
a(): 1.000009 b(): 1.000003 c(): 0.000001
Output for 7.2.11, 7.2.22
a(): 1.000014 b(): 1.000002 c(): 0.000000
Output for 7.2.21
a(): 1.000011 b(): 1.000002 c(): 0.000001
Output for 7.2.17, 7.2.20
a(): 1.000012 b(): 1.000002 c(): 0.000001
Output for 7.2.19
a(): 1.000013 b(): 1.000004 c(): 0.000000
Output for 7.2.15
a(): 1.000008 b(): 1.000004 c(): 0.000000
Output for 7.2.14
a(): 1.000006 b(): 1.000003 c(): 0.000000
Output for 7.1.8, 7.2.13
a(): 1.000007 b(): 1.000004 c(): 0.000000
Output for 7.2.12
a(): 1.000011 b(): 1.000003 c(): 0.000001
Output for 7.2.10
a(): 1.000012 b(): 1.000002 c(): 0.000000
Output for 7.2.9
a(): 1.000027 b(): 1.000003 c(): 0.000000
Output for 7.2.7 - 7.2.8
a(): 1.000006 b(): 1.000003 c(): 0.000001
Output for 7.2.4
a(): 1.000012 b(): 1.000003 c(): 0.000001
Output for 7.1.2, 7.1.13, 7.2.3
a(): 1.000007 b(): 1.000003 c(): 0.000001
Output for 7.2.2
a(): 1.000015 b(): 1.000003 c(): 0.000000
Output for 7.2.1
a(): 1.000008 b(): 1.000004 c(): 0.000001
Output for 7.0.23, 7.0.27, 7.1.33
a(): 1.000002 b(): 1.000003 c(): 0.000000
Output for 7.0.1 - 7.0.2, 7.0.9, 7.0.14, 7.0.21, 7.0.26, 7.1.3, 7.1.32
a(): 1.000002 b(): 1.000002 c(): 0.000001
Output for 7.1.31
a(): 1.000005 b(): 1.000003 c(): 0.000000
Output for 7.0.33, 7.1.0, 7.1.6, 7.1.23, 7.1.30
a(): 1.000002 b(): 1.000003 c(): 0.000001
Output for 7.1.27, 7.1.29
a(): 1.000007 b(): 1.000002 c(): 0.000000
Output for 7.0.0, 7.0.3, 7.0.5 - 7.0.6, 7.0.17 - 7.0.19, 7.1.28
a(): 1.000003 b(): 1.000003 c(): 0.000001
Output for 7.0.7, 7.0.31, 7.1.1, 7.1.24 - 7.1.25
a(): 1.000003 b(): 1.000002 c(): 0.000000
Output for 7.0.24, 7.0.28, 7.1.22
a(): 1.000002 b(): 1.000002 c(): 0.000000
Output for 7.0.22, 7.0.32, 7.1.21
a(): 1.000002 b(): 1.000004 c(): 0.000000
Output for 7.1.19
a(): 1.000006 b(): 1.000002 c(): 0.000000
Output for 7.0.29, 7.1.17
a(): 1.000003 b(): 1.000004 c(): 0.000000
Output for 7.1.7, 7.1.10, 7.1.14
a(): 1.000007 b(): 1.000002 c(): 0.000001
Output for 7.0.10, 7.0.12, 7.0.15 - 7.0.16, 7.1.11 - 7.1.12
a(): 1.000003 b(): 1.000003 c(): 0.000000
Output for 7.0.30
a(): 1.000003 b(): 1.000007 c(): 0.000000
Output for 7.0.25
a(): 1.000004 b(): 1.000002 c(): 0.000001
Output for 7.0.4, 7.0.8, 7.0.13, 7.0.20
a(): 1.000003 b(): 1.000002 c(): 0.000001
Output for 7.0.11
a(): 1.000004 b(): 1.000002 c(): 0.000000
Output for 5.4.2, 5.4.9, 5.4.20, 5.4.33, 5.4.35, 5.5.1, 5.5.20, 5.6.2, 5.6.21, 5.6.30, 5.6.33, 5.6.40
a(): 1.000009 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.4.8, 5.4.21 - 5.4.22, 5.4.24, 5.4.26, 5.4.36, 5.5.9, 5.5.13, 5.5.17, 5.5.24, 5.5.29, 5.6.5, 5.6.17, 5.6.23, 5.6.28 - 5.6.29, 5.6.35, 5.6.39
a(): 1.000009 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.4.44, 5.5.25, 5.6.3, 5.6.38
a(): 1.000009 b(): 1.000007 c(): 0.000002 d(): N/A
Output for 5.6.37
a(): 1.000015 b(): 1.000005 c(): 0.000001 d(): N/A
Output for 5.5.37, 5.6.36
a(): 1.000014 b(): 1.000007 c(): 0.000002 d(): N/A
Output for 5.6.34
a(): 1.000015 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.4.10, 5.4.18, 5.4.31, 5.5.31, 5.6.4, 5.6.32
a(): 1.000008 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.4.5, 5.4.12, 5.4.28, 5.4.37, 5.4.40, 5.5.11, 5.5.33, 5.6.7, 5.6.18, 5.6.25, 5.6.31
a(): 1.000008 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.6.27
a(): 1.000007 b(): 1.000006 c(): 0.000001 d(): N/A
Output for 5.6.26
a(): 1.000014 b(): 1.000006 c(): 0.000001 d(): N/A
Output for 5.6.16, 5.6.24
a(): 1.000007 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.6.22
a(): 1.000009 b(): 1.000004 c(): 0.000003 d(): N/A
Output for 5.4.30, 5.6.20
a(): 1.000009 b(): 1.000005 c(): 0.000003 d(): N/A
Output for 5.4.13, 5.4.17, 5.4.19, 5.5.7, 5.5.21, 5.6.19
a(): 1.000008 b(): 1.000007 c(): 0.000002 d(): N/A
Output for 5.5.0, 5.6.15
a(): 1.000014 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.6.14
a(): 1.000013 b(): 1.000005 c(): 0.000003 d(): N/A
Output for 5.5.34, 5.6.13
a(): 1.000008 b(): 1.000004 c(): 0.000003 d(): N/A
Output for 5.6.12
a(): 1.000007 b(): 1.000007 c(): 0.000002 d(): N/A
Output for 5.4.15, 5.4.27, 5.5.3, 5.5.35, 5.6.1, 5.6.11
a(): 1.000008 b(): 1.000004 c(): 0.000002 d(): N/A
Output for 5.6.10
a(): 1.000007 b(): 1.000006 c(): 0.000003 d(): N/A
Output for 5.4.16, 5.6.6, 5.6.9
a(): 1.000013 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.6.8
a(): 1.000013 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.6.0
a(): 1.000016 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.5.18, 5.5.32, 5.5.36, 5.5.38
a(): 1.000009 b(): 1.000006 c(): 0.000003 d(): N/A
Output for 5.5.30
a(): 1.000006 b(): 1.000004 c(): 0.000003 d(): N/A
Output for 5.5.28
a(): 1.000009 b(): 1.000007 c(): 0.000003 d(): N/A
Output for 5.5.8, 5.5.27
a(): 1.000010 b(): 1.000005 c(): 0.000003 d(): N/A
Output for 5.4.3, 5.4.41, 5.5.26
a(): 1.000009 b(): 1.000006 c(): 0.000001 d(): N/A
Output for 5.4.11, 5.4.14, 5.5.23
a(): 1.000015 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.4.4, 5.5.5 - 5.5.6, 5.5.19, 5.5.22
a(): 1.000008 b(): 1.000005 c(): 0.000003 d(): N/A
Output for 5.5.12, 5.5.16
a(): 1.000008 b(): 1.000007 c(): 0.000003 d(): N/A
Output for 5.5.15
a(): 1.000010 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.5.14
a(): 1.000014 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.4.29, 5.4.38, 5.5.10
a(): 1.000008 b(): 1.000006 c(): 0.000003 d(): N/A
Output for 5.4.42, 5.5.4
a(): 1.000007 b(): 1.000004 c(): 0.000002 d(): N/A
Output for 5.5.2
a(): 1.000006 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.4.45
a(): 1.000011 b(): 1.000005 c(): 0.000003 d(): N/A
Output for 5.4.23, 5.4.43
a(): 1.000012 b(): 1.000006 c(): 0.000002 d(): N/A
Output for 5.4.39
a(): 1.000010 b(): 1.000007 c(): 0.000002 d(): N/A
Output for 5.4.34
a(): 1.000012 b(): 1.000007 c(): 0.000002 d(): N/A
Output for 5.4.32
a(): 1.000013 b(): 1.000006 c(): 0.000003 d(): N/A
Output for 5.4.25
a(): 1.000011 b(): 1.000004 c(): 0.000002 d(): N/A
Output for 5.4.7
a(): 1.000008 b(): 1.000007 c(): 0.000001 d(): N/A
Output for 5.4.6
a(): 1.000008 b(): 1.000006 c(): 0.000001 d(): N/A
Output for 5.4.1
a(): 1.000007 b(): 1.000005 c(): 0.000002 d(): N/A
Output for 5.4.0
a(): 1.000010 b(): 1.000005 c(): 0.000002 d(): N/A
preferences:
154.97 ms | 401 KiB | 242 Q