_convert_to_string  587 Zend/zend_operators.c 			_convert_to_string(op ZEND_FILE_LINE_CC);
_convert_to_string  342 Zend/zend_operators.h #define convert_to_string(op) if ((op)->type != IS_STRING) { _convert_to_string((op) ZEND_FILE_LINE_CC); }