_convert_to_cstring  242 Zend/zend_operators.h ZEND_API void ZEND_FASTCALL _convert_to_cstring(zval *op ZEND_FILE_LINE_DC);
_convert_to_cstring  273 Zend/zend_operators.h #define convert_to_cstring(op) if (Z_TYPE_P(op) != IS_STRING) { _convert_to_cstring((op) ZEND_FILE_LINE_CC); }