Php addslashes Function

Php addslashes function finally corresponds to the c function: 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 '\ 0 ': 3268 * target ++ = '\'; 3269 * target ++ = '0'; 3270 break; 3271 case '\'': 3272 * target ++ = '\ ''; 3273 * target ++ =' \''; 3274 break; 3275 default: 3276 * target ++ = * source; 3277 break; 3278} 3279 source ++; 3280} 3281} else {3282 while (source <end) {3283 switch (* source) {3284 case '\ 0 ': 3285 * target ++ = '\'; 3286 * target ++ = '0'; 3287 break; 3288 case '\ '': 3289 case' \" ': 3290 case '\\': 3291 * target ++ = '\'; 3292/* break is missing * intentionally **/3293 default: 3294 * target ++ = * source; 3295 break; 3296} 3297 3298 source ++; 3299} 3300 3301 3302 * target = 0; 3303 * new_length = target-new_str; 3304 if (should_free) {3305 STR_FREE (str ); 3306} 3307 new_str = (char *) erealloc (new_str, * new_length + 1); 3 308 return new_str; 3309} from the above, the addslashes function processes single-byte bytes. However, gbk encoding is dual-byte. And 5c can be used as a dual-Byte Low Position.