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str_shuffle() function added. Like shuffle() for arrays - however the

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algorithm for creating the permutation is quite simple. More like
the implementation of shuffle() for 4.2.1 .
This commit is contained in:
Andrey Hristov 2002-09-25 18:06:05 +00:00
parent c9b9e63ea3
commit fc46a46b06
3 changed files with 35 additions and 0 deletions
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1
ext/standard/basic_functions.c
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@ -329,6 +329,7 @@ function_entry basic_functions[] = {
PHP_FE(strstr, NULL)
PHP_FE(stristr, NULL)
PHP_FE(strrchr, NULL)
PHP_FE(str_shuffle, NULL)
#ifdef HAVE_STRCOLL
PHP_FE(strcoll, NULL)

1
ext/standard/php_string.h
View file

@ -82,6 +82,7 @@ PHP_FUNCTION(strnatcasecmp);
PHP_FUNCTION(substr_count);
PHP_FUNCTION(str_pad);
PHP_FUNCTION(sscanf);
PHP_FUNCTION(str_shuffle);
#ifdef HAVE_STRCOLL
PHP_FUNCTION(strcoll);
#endif

33
ext/standard/string.c
View file

@ -3933,6 +3933,39 @@ PHP_FUNCTION(str_rot13)
/* }}} */
static int php_string_shuffle(const void *a, const void *b TSRMLS_DC)
{
long rnd;
rnd = php_rand(TSRMLS_C);
if (rnd % 3)
return 1;
else if (rnd % 5)
return 0;
else
return -1;
}
/* {{{ proto string str_shuffle(string str)
Shuffles string. One permutation of all possible is created */
PHP_FUNCTION(str_shuffle)
{
/* Note : by using current php_string_shuffle for string */
/* with 6 chars (6! permutations) about 2/3 of them are */
/* computed for 6! calls for the function. So it isn't so */
/* unique. The ratio is the same for other lengths. */
char *str;
int i, str_len;
i = 0;
if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &str, &str_len) == FAILURE) {
RETURN_FALSE;
}
zend_qsort((void *)str, str_len, sizeof(char), php_string_shuffle TSRMLS_CC);
RETURN_STRINGL(str, str_len, 1);
}
/* }}} */
#if HAVE_STRFMON
/* {{{ proto string money_format(string format , float value)
Convert monetary value(s) to string */