@ 2014-06-09T15:52:36Z <?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;
}
*/
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Output for 4.3.0 - 4.3.11 , 4.4.0 - 4.4.9 , 5.0.0 - 5.0.5 , 5.1.0 - 5.1.6 , 5.2.0 - 5.2.17 , 5.3.0 - 5.3.29 , 5.4.0 - 5.4.45 , 5.5.0 - 5.5.38 , 5.6.0 - 5.6.40 , 7.0.0 - 7.0.33 , 7.1.0 - 7.1.33 , 7.2.0 - 7.2.33 , 7.3.0 - 7.3.33 , 7.4.0 - 7.4.33 , 8.0.0 - 8.0.30 , 8.1.0 - 8.1.28 , 8.2.0 - 8.2.18 , 8.3.0 - 8.3.4 , 8.3.6 string(10) "!PHP olleH"
string(9) "!PHP olle"
Output for 8.3.5 Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
string(10) "!PHP olleH"
string(9) "!PHP olle"
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272.46 ms | 402 KiB | 460 Q