Fix last maybe uninit warnings on 7.4

Most of these only occur under GCC 5. Not fond of all the workarounds
(especially the PDO one), but it gets us a clean build...

Author: nikic

Zend/zend_vm_def.h

@@ -7932,7 +7932,7 @@ ZEND_VM_HANDLER(157, ZEND_FETCH_CLASS_NAME, UNUSED|CLASS_FETCH, ANY)
 
 ZEND_VM_HANDLER(158, ZEND_CALL_TRAMPOLINE, ANY, ANY)
 {
-	zend_array *args;
+	zend_array *args = NULL;
 	zend_function *fbc = EX(func);
 	zval *ret = EX(return_value);
 	uint32_t call_info = EX_CALL_INFO() & (ZEND_CALL_NESTED | ZEND_CALL_TOP | ZEND_CALL_RELEASE_THIS);
@@ -7963,7 +7963,7 @@ ZEND_VM_HANDLER(158, ZEND_CALL_TRAMPOLINE, ANY, ANY)
 	ZEND_CALL_NUM_ARGS(call) = 2;
 
 	ZVAL_STR(ZEND_CALL_ARG(call, 1), fbc->common.function_name);
-	if (num_args) {
+	if (args) {
 		ZVAL_ARR(ZEND_CALL_ARG(call, 2), args);
 	} else {
 		ZVAL_EMPTY_ARRAY(ZEND_CALL_ARG(call, 2));

Zend/zend_vm_execute.h

@@ -2134,7 +2134,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_ASSERT_CHECK_SPEC_HANDLER(ZEND
 
 static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_CALL_TRAMPOLINE_SPEC_HANDLER(ZEND_OPCODE_HANDLER_ARGS)
 {
-	zend_array *args;
+	zend_array *args = NULL;
 	zend_function *fbc = EX(func);
 	zval *ret = EX(return_value);
 	uint32_t call_info = EX_CALL_INFO() & (ZEND_CALL_NESTED | ZEND_CALL_TOP | ZEND_CALL_RELEASE_THIS);
@@ -2165,7 +2165,7 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_CALL_TRAMPOLINE_SPEC_HANDLER(Z
 	ZEND_CALL_NUM_ARGS(call) = 2;
 
 	ZVAL_STR(ZEND_CALL_ARG(call, 1), fbc->common.function_name);
-	if (num_args) {
+	if (args) {
 		ZVAL_ARR(ZEND_CALL_ARG(call, 2), args);
 	} else {
 		ZVAL_EMPTY_ARRAY(ZEND_CALL_ARG(call, 2));

ext/pdo/pdo_stmt.c

@@ -819,7 +819,7 @@ static int do_fetch(pdo_stmt_t *stmt, int do_bind, zval *return_value, enum pdo_
 {
 	int flags, idx, old_arg_count = 0;
 	zend_class_entry *ce = NULL, *old_ce = NULL;
-	zval grp_val, *pgrp, retval, old_ctor_args;
+	zval grp_val, *pgrp, retval, old_ctor_args = {0};
 	int colno;
 
 	if (how == PDO_FETCH_USE_DEFAULT) {

ext/simplexml/simplexml.c

@@ -1016,6 +1016,7 @@ static int sxe_prop_is_empty(zval *object) /* {{{ */
 	zval             iter_data;
 	int              test;
 	int              is_empty;
+	int              use_iter = 0;
 
 	sxe = Z_SXEOBJ_P(object);
 
@@ -1052,6 +1053,7 @@ static int sxe_prop_is_empty(zval *object) /* {{{ */
 				ZVAL_COPY_VALUE(&iter_data, &sxe->iter.data);
 				ZVAL_UNDEF(&sxe->iter.data);
 				node = php_sxe_reset_iterator(sxe, 0);
+				use_iter = 1;
 			}
 		}
 
@@ -1080,15 +1082,15 @@ static int sxe_prop_is_empty(zval *object) /* {{{ */
 			is_empty = 0;
 			break;
 next_iter:
-			if (!Z_ISUNDEF(iter_data)) {
+			if (use_iter) {
 				node = php_sxe_iterator_fetch(sxe, node->next, 0);
 			} else {
 				node = node->next;
 			}
 		}
 	}
 
-	if (!Z_ISUNDEF(iter_data)) {
+	if (use_iter) {
 		if (!Z_ISUNDEF(sxe->iter.data)) {
 			zval_ptr_dtor(&sxe->iter.data);
 		}

ext/sockets/conversions.c

@@ -701,6 +701,9 @@ static void from_zval_write_sockaddr_aux(const zval *container,
 	zval	*elem;
 	int		fill_sockaddr;
 
+	*sockaddr_ptr = NULL;
+	*sockaddr_len = 0;
+
 	if (Z_TYPE_P(container) != IS_ARRAY) {
 		do_from_zval_err(ctx, "%s", "expected an array here");
 		return;

ext/standard/php_fopen_wrapper.c

@@ -181,7 +181,7 @@ php_stream * php_stream_url_wrap_php(php_stream_wrapper *wrapper, const char *pa
 	int fd = -1;
 	int mode_rw = 0;
 	php_stream * stream = NULL;
-	char *p, *token, *pathdup;
+	char *p, *token = NULL, *pathdup;
 	zend_long max_memory;
 	FILE *file = NULL;
 #ifdef PHP_WIN32

sapi/cli/php_cli_server.c

@@ -1448,6 +1448,7 @@ static void normalize_vpath(char **retval, size_t *retval_len, const char *vpath
 	char *p;
 
 	*retval = NULL;
+	*retval_len = 0;
 
 	decoded_vpath = pestrndup(vpath, vpath_len, persistent);
 	if (!decoded_vpath) {