<?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 > -1) {
$new_string .= $string[$len];
}
return $new_string;
}
$string = "Hello PHP!";
$c = 1000;
$results = array();
$tests = array('strrev', 'userland_strrev');
foreach ($tests as $test) {
for ($i = 0; $i < $c; $i++) {
$t = microtime(true);
$test($string);
$results[$test][] = microtime(true) - $t;
}
$avg = array_sum($results[$test]) / count($results[$test]);
printf("Average cost for function $test: %.6f ms\n", $avg);
}
- Output for 5.5.26, 5.5.28 - 5.5.30, 5.5.32, 5.5.34, 5.6.8 - 5.6.10, 5.6.13, 5.6.16, 5.6.18 - 5.6.19, 7.0.0 - 7.0.20, 7.1.0 - 7.1.7, 7.2.0 - 7.2.2, 7.2.4 - 7.2.5, 7.2.7 - 7.2.8, 7.2.10, 7.2.12 - 7.2.13, 7.3.0 - 7.3.1
- Average cost for function strrev: 0.000000 ms
Average cost for function userland_strrev: 0.000001 ms
- Output for 7.2.11
- Average cost for function strrev: 0.000000 ms
Average cost for function userland_strrev: 0.000008 ms
- Output for 5.4.45, 7.2.3, 7.2.9
- Average cost for function strrev: 0.000000 ms
Average cost for function userland_strrev: 0.000006 ms
- Output for 5.2.0 - 5.2.9, 5.3.0, 5.3.4, 5.3.6, 5.3.10 - 5.3.13, 5.3.16, 5.3.18 - 5.3.25, 5.3.29, 5.4.3, 5.4.5, 5.4.9 - 5.4.12, 5.4.16, 5.4.19, 5.4.21 - 5.4.29, 5.4.31 - 5.4.32, 5.4.35, 5.4.39 - 5.4.40, 5.4.42, 5.5.24 - 5.5.25, 5.5.27, 5.5.31, 5.5.33, 5.5.35, 5.6.11 - 5.6.12, 5.6.14 - 5.6.15, 5.6.17, 5.6.20 - 5.6.28, 7.1.25, 7.2.6
- Average cost for function strrev: 0.000000 ms
Average cost for function userland_strrev: 0.000002 ms
- Output for 5.4.44
- Average cost for function strrev: 0.000000 ms
Average cost for function userland_strrev: 0.000005 ms
- Output for 5.1.0 - 5.1.6, 5.2.12 - 5.2.13, 5.3.5, 5.3.17, 5.4.30, 5.4.38, 5.4.43
- Average cost for function strrev: 0.000000 ms
Average cost for function userland_strrev: 0.000003 ms
- Output for 5.3.7, 5.3.15, 5.3.27 - 5.3.28, 5.4.0 - 5.4.2, 5.4.4, 5.4.6 - 5.4.8, 5.4.13 - 5.4.15, 5.4.17 - 5.4.18, 5.4.20, 5.4.37, 5.4.41
- Average cost for function strrev: 0.000001 ms
Average cost for function userland_strrev: 0.000003 ms
- Output for 5.0.3, 5.2.17, 5.3.2, 5.3.8, 5.3.14, 5.4.34, 5.4.36
- Average cost for function strrev: 0.000001 ms
Average cost for function userland_strrev: 0.000004 ms
- Output for 5.3.1, 5.3.3, 5.3.9, 5.3.26
- Average cost for function strrev: 0.000001 ms
Average cost for function userland_strrev: 0.000002 ms
- Output for 4.3.1 - 4.3.2, 4.3.4 - 4.3.8, 4.4.0 - 4.4.1, 4.4.4 - 4.4.6, 5.2.10, 5.2.16
- Average cost for function strrev: 0.000001 ms
Average cost for function userland_strrev: 0.000006 ms
- Output for 4.3.10, 4.4.2, 4.4.7 - 4.4.9, 5.0.0 - 5.0.2, 5.0.4 - 5.0.5, 5.2.11, 5.2.15
- Average cost for function strrev: 0.000001 ms
Average cost for function userland_strrev: 0.000005 ms
- Output for 4.3.9, 5.2.14
- Average cost for function strrev: 0.000001 ms
Average cost for function userland_strrev: 0.000007 ms
- Output for 4.3.0, 4.3.11, 4.4.3
- Average cost for function strrev: 0.000002 ms
Average cost for function userland_strrev: 0.000007 ms
- Output for 4.3.3
- Average cost for function strrev: 0.000003 ms
Average cost for function userland_strrev: 0.000006 ms
preferences:
162.85 ms | 401 KiB | 190 Q