fix typo

main/SAPI.c

@@ -597,7 +597,7 @@ SAPI_API int sapi_header_op(sapi_header_op_enum op, void *arg TSRMLS_DC)
 				continue;
 			}
 			efree(header_line);
-			sapi_module.sapi_error(E_WARNING, "Header may not contain more then a single header, new line detected.");
+			sapi_module.sapi_error(E_WARNING, "Header may not contain more than a single header, new line detected.");
 			return FAILURE;
 		}
 	}