zend_str_tolower_dup_ex  343 Zend/zend_operators.h ZEND_API char*        ZEND_FASTCALL zend_str_tolower_dup_ex(const char *source, size_t length);
zend_str_tolower_dup_ex 4730 ext/standard/string.c 		allow_free = zend_str_tolower_dup_ex(allow, allow_len);