php addslashes function_PHP tutorial

php addslashes函数最终对应的c函数为：

 

3244 PHPAPI char *php_addslashes_ex(char *str, int length, int *new_length, int should_free, int ignore_sybase TS     RMLS_DC)

3245 {

3246     /* maximum string length, worst case situation */

3247     char *new_str;

3248     char *source, *target;

3249     char *end;

3250     int local_new_length;

3251 

3252     if (!new_length) {

3253         new_length = &local_new_length;

3254     }

3255     if (!str) {

3256         *new_length = 0;

3257         return str;

3258     }

3259     new_str = (char *) safe_emalloc(2, (length ? length : (length = strlen(str))), 1);

3260     source = str;

3261     end = source + length;

3262     target = new_str;

3263 

3264     if (!ignore_sybase && PG(magic_quotes_sybase)) {

3265         while (source < end) {

3266             switch (*source) {

3267                 case '