3v4l.org

run code in 300+ PHP versions simultaneously
<?php /** strrev function implementation taken from ext/standard/string.c PHP-5-5 branch http://lxr.php.net/xref/PHP_5_5/ext/standard/string.c#3165 // {{{ proto string strrev(string str) // Reverse a string PHP_FUNCTION(strrev) { char *str; char *e, *n, *p; int str_len; if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) { return; } n = emalloc(str_len+1); p = n; e = str + str_len; while (--e>=str) { *p++ = *e; } *p = '\0'; RETVAL_STRINGL(n, str_len, 0); } // }}} */ // PHP Implementation function userland_strrev($string) { if (!is_string($string)) { return false; } $new_string = ""; $len = strlen($string); while (--$len) { $new_string .= $string[$len]; } return $new_string. } $string = "Hello PHP!"; var_dump(strrev($string), userland_strrev($string)); /* for ($i = 0; $i < $n; $i++) { $t = microtime(true); $php[] = microtime(true) - $t; } */

Here you find the average performance (time & memory) of each version. A grayed out version indicates it didn't complete successfully (based on exit-code).

VersionSystem time (s)User time (s)Memory (MiB)
5.4.290.0060.05112.50
5.4.280.0090.03512.39
5.4.270.0040.03812.39
5.4.260.0070.03612.39
5.4.250.0030.04112.39
5.4.240.0050.03612.39
5.4.230.0050.03812.38
5.4.220.0060.03612.38
5.4.210.0050.03712.39
5.4.200.0080.04212.39
5.4.190.0090.04612.38
5.4.180.0080.04912.38
5.4.170.0100.05012.39
5.4.160.0090.05012.39
5.4.150.0100.04312.38
5.4.140.0120.04612.07
5.4.130.0070.04512.05
5.4.120.0120.04412.02
5.4.110.0080.04112.01
5.4.100.0050.03612.02
5.4.90.0100.03412.01
5.4.80.0040.04112.02
5.4.70.0090.03712.01
5.4.60.0050.03512.01
5.4.50.0040.04012.01
5.4.40.0080.03412.00
5.4.30.0060.03711.99
5.4.20.0050.03611.99
5.4.10.0110.03012.00
5.4.00.0060.03711.48
5.3.280.0090.03712.71
5.3.270.0040.04312.72
5.3.260.0060.04312.71
5.3.250.0080.03812.72
5.3.240.0100.03612.72
5.3.230.0060.04412.71
5.3.220.0090.03512.68
5.3.210.0120.04812.68
5.3.200.0080.05412.68
5.3.190.0080.05012.67
5.3.180.0210.03812.67
5.3.170.0190.03112.67
5.3.160.0090.03312.67
5.3.150.0090.03612.68
5.3.140.0110.04512.66
5.3.130.0200.05012.66
5.3.120.0110.04912.65
5.3.110.0120.04812.66
5.3.100.0070.05012.12
5.3.90.0120.04712.11
5.3.80.0130.04612.09
5.3.70.0060.03812.10
5.3.60.0060.04212.08
5.3.50.0090.03512.03
5.3.40.0070.03712.03
5.3.30.0160.04911.98
5.3.20.0140.06611.77
5.3.10.0050.05311.74
5.3.00.0050.05411.72
5.2.170.0080.0369.22
5.2.160.0070.0359.22
5.2.150.0080.0339.22
5.2.140.0020.0339.21
5.2.130.0040.0299.18
5.2.120.0070.0269.17
5.2.110.0060.0279.18
5.2.100.0050.0289.18
5.2.90.0040.0309.18
5.2.80.0060.0309.18
5.2.70.0050.0329.17
5.2.60.0050.0309.13
5.2.50.0040.0309.10
5.2.40.0040.0299.07
5.2.30.0030.0339.05
5.2.20.0050.0299.04
5.2.10.0050.0338.94
5.2.00.0050.0308.82
5.1.60.0070.0248.10
5.1.50.0040.0268.09
5.1.40.0020.0278.07
5.1.30.0040.0278.42
5.1.20.0080.0348.44
5.1.10.0050.0298.17
5.1.00.0030.0278.17
5.0.50.0050.0196.65
5.0.40.0040.0196.51
5.0.30.0050.0296.31
5.0.20.0030.0206.29
5.0.10.0070.0176.27
5.0.00.0050.0326.25
4.4.90.0010.0174.78
4.4.80.0020.0154.75
4.4.70.0040.0144.75
4.4.60.0030.0154.75
4.4.50.0020.0164.77
4.4.40.0040.0234.71
4.4.30.0040.0144.75
4.4.20.0010.0174.84
4.4.10.0040.0144.85
4.4.00.0030.0254.76
4.3.110.0040.0144.67
4.3.100.0030.0154.66
4.3.90.0020.0154.64
4.3.80.0080.0214.58
4.3.70.0040.0134.63
4.3.60.0020.0154.63
4.3.50.0050.0134.63
4.3.40.0030.0234.54
4.3.30.0010.0163.30
4.3.20.0020.0153.28
4.3.10.0010.0163.25
4.3.00.0000.0237.15

preferences:
144.05 ms | 1394 KiB | 7 Q