diff --git a/NEWS b/NEWS
index 4fde6a2b10d..40a6e52dff8 100644
--- a/NEWS
+++ b/NEWS
@@ -63,6 +63,9 @@ PHP                                                                        NEWS
   . Added pg_close_stmt to close a prepared statement while allowing
     its name to be reused. (David Carlier)
   . Added Iterable support for pgsql_copy_from. (David Carlier)
+  . pg_connect checks if connection_string contains any null byte,
+    pg_close_stmt check if the statement contains any null byte.
+    (David Carlier)
 
 - POSIX:
   . Added POSIX_SC_OPEN_MAX constant to get the number of file descriptors
diff --git a/UPGRADING b/UPGRADING
index 7e50c0e7a93..805d2f62440 100644
--- a/UPGRADING
+++ b/UPGRADING
@@ -125,6 +125,10 @@ PHP 8.5 UPGRADE NOTES
 
 - PGSQL:
   . pg_copy_from also supports inputs as Iterable.
+  . pg_connect checks if the connection_string argument contains
+    any null byte.
+  . pg_close_stmt checks if the statement_name argument contains
+    any null byte.
 
 - POSIX:
   . posix_ttyname sets last_error to EBADF when encountering
diff --git a/ext/pgsql/pgsql.c b/ext/pgsql/pgsql.c
index 4854fdbfd1a..b1a1dfb49a7 100644
--- a/ext/pgsql/pgsql.c
+++ b/ext/pgsql/pgsql.c
@@ -665,7 +665,7 @@ static void php_pgsql_do_connect(INTERNAL_FUNCTION_PARAMETERS, int persistent)
 	PGresult *pg_result;
 
 	ZEND_PARSE_PARAMETERS_START(1, 2)
-		Z_PARAM_STRING(connstring, connstring_len)
+		Z_PARAM_PATH(connstring, connstring_len)
 		Z_PARAM_OPTIONAL
 		Z_PARAM_LONG(connect_type)
 	ZEND_PARSE_PARAMETERS_END();
@@ -1123,7 +1123,7 @@ PHP_FUNCTION(pg_query)
 	zval *pgsql_link = NULL;
 	char *query;
 	size_t query_len;
-	int leftover = 0;
+	bool leftover = false;
 	pgsql_link_handle *link;
 	PGconn *pgsql;
 	PGresult *pgsql_result;
@@ -1157,7 +1157,7 @@ PHP_FUNCTION(pg_query)
 	}
 	while ((pgsql_result = PQgetResult(pgsql))) {
 		PQclear(pgsql_result);
-		leftover = 1;
+		leftover = true;
 	}
 	if (leftover) {
 		php_error_docref(NULL, E_NOTICE, "Found results on this connection. Use pg_get_result() to get these results first");
@@ -1220,7 +1220,7 @@ PHP_FUNCTION(pg_query_params)
 	zval *pv_param_arr, *tmp;
 	char *query;
 	size_t query_len;
-	int leftover = 0;
+	bool leftover = false;
 	int num_params = 0;
 	char **params = NULL;
 	pgsql_link_handle *link;
@@ -1259,7 +1259,7 @@ PHP_FUNCTION(pg_query_params)
 	}
 	while ((pgsql_result = PQgetResult(pgsql))) {
 		PQclear(pgsql_result);
-		leftover = 1;
+		leftover = true;
 	}
 	if (leftover) {
 		php_error_docref(NULL, E_NOTICE, "Found results on this connection. Use pg_get_result() to get these results first");
@@ -1335,7 +1335,7 @@ PHP_FUNCTION(pg_prepare)
 	zval *pgsql_link = NULL;
 	char *query, *stmtname;
 	size_t query_len, stmtname_len;
-	int leftover = 0;
+	bool leftover = false;
 	PGconn *pgsql;
 	pgsql_link_handle *link;
 	PGresult *pgsql_result;
@@ -1372,7 +1372,7 @@ PHP_FUNCTION(pg_prepare)
 	}
 	while ((pgsql_result = PQgetResult(pgsql))) {
 		PQclear(pgsql_result);
-		leftover = 1;
+		leftover = true;
 	}
 	if (leftover) {
 		php_error_docref(NULL, E_NOTICE, "Found results on this connection. Use pg_get_result() to get these results first");
@@ -1422,7 +1422,7 @@ PHP_FUNCTION(pg_execute)
 	zval *pv_param_arr, *tmp;
 	char *stmtname;
 	size_t stmtname_len;
-	int leftover = 0;
+	bool leftover = false;
 	int num_params = 0;
 	char **params = NULL;
 	PGconn *pgsql;
@@ -1461,7 +1461,7 @@ PHP_FUNCTION(pg_execute)
 	}
 	while ((pgsql_result = PQgetResult(pgsql))) {
 		PQclear(pgsql_result);
-		leftover = 1;
+		leftover = true;
 	}
 	if (leftover) {
 		php_error_docref(NULL, E_NOTICE, "Found results on this connection. Use pg_get_result() to get these results first");
@@ -1690,7 +1690,7 @@ PHP_FUNCTION(pg_field_table)
 	zval *result;
 	pgsql_result_handle *pg_result;
 	zend_long fnum = -1;
-	bool return_oid = 0;
+	bool return_oid = false;
 
 	ZEND_PARSE_PARAMETERS_START(2, 3)
 		Z_PARAM_OBJECT_OF_CLASS(result, pgsql_result_ce)
@@ -2770,14 +2770,14 @@ PHP_FUNCTION(pg_lo_write)
 	zval *pgsql_id;
 	zend_string *str;
 	zend_long z_len;
-	bool z_len_is_null = 1;
+	bool z_len_is_null = true;
 	size_t nbytes;
 	size_t len;
 	pgLofp *pgsql;
 
 	ZEND_PARSE_PARAMETERS_START(2, 3)
 		Z_PARAM_OBJECT_OF_CLASS(pgsql_id, pgsql_lob_ce)
-		Z_PARAM_STR(str)
+		Z_PARAM_PATH_STR(str)
 		Z_PARAM_OPTIONAL
 		Z_PARAM_LONG_OR_NULL(z_len, z_len_is_null)
 	ZEND_PARSE_PARAMETERS_END();
@@ -3346,7 +3346,7 @@ PHP_FUNCTION(pg_copy_to)
 	switch (status) {
 		case PGRES_COPY_OUT:
 			if (pgsql_result) {
-				int copydone = 0;
+				bool copydone = false;
 
 				PQclear(pgsql_result);
 				array_init(return_value);
@@ -3355,7 +3355,7 @@ PHP_FUNCTION(pg_copy_to)
 					int ret = PQgetCopyData(pgsql, &csv, 0);
 					switch (ret) {
 						case -1:
-							copydone = 1;
+							copydone = true;
 							break;
 						case 0:
 						case -2:
@@ -4654,7 +4654,7 @@ PHP_FUNCTION(pg_meta_data)
 	zval *pgsql_link;
 	pgsql_link_handle *link;
 	zend_string *table_name;
-	bool extended=0;
+	bool extended = false;
 	PGconn *pgsql;
 
 	ZEND_PARSE_PARAMETERS_START(2, 3)
@@ -4832,7 +4832,7 @@ static zend_string *php_pgsql_add_quotes(zend_string *src)
 		/* if new_value is string "NULL" and field has default value, remove element to use default value */ \
 		if (!(opt & PGSQL_CONV_IGNORE_DEFAULT) && Z_TYPE_P(has_default) == IS_TRUE) { \
 			zval_ptr_dtor(&new_val); \
-			skip_field = 1; \
+			skip_field = true; \
 		} \
 		/* raise error if it's not null and cannot be ignored */ \
 		else if (!(opt & PGSQL_CONV_IGNORE_NOT_NULL) && Z_TYPE_P(not_null) == IS_TRUE) { \
@@ -4848,7 +4848,8 @@ PHP_PGSQL_API zend_result php_pgsql_convert(PGconn *pg_link, const zend_string *
 {
 	zend_string *field = NULL;
 	zval meta, *def, *type, *not_null, *has_default, *is_enum, *val, new_val;
-	int err = 0, skip_field;
+	int err = 0;
+	bool skip_field;
 	php_pgsql_data_type data_type;
 
 	ZEND_ASSERT(pg_link != NULL);
@@ -4867,7 +4868,7 @@ PHP_PGSQL_API zend_result php_pgsql_convert(PGconn *pg_link, const zend_string *
 	}
 
 	ZEND_HASH_FOREACH_STR_KEY_VAL(Z_ARRVAL_P(values), field, val) {
-		skip_field = 0;
+		skip_field = false;
 		ZVAL_DEREF(val);
 		ZVAL_NULL(&new_val);
 
@@ -6324,11 +6325,11 @@ PHP_FUNCTION(pg_close_stmt)
 
 	ZEND_PARSE_PARAMETERS_START(2, 2)
 		Z_PARAM_OBJECT_OF_CLASS(pgsql_link, pgsql_link_ce)
-		Z_PARAM_STR(stmt)
+		Z_PARAM_PATH_STR(stmt)
 	ZEND_PARSE_PARAMETERS_END();
 
 	if (ZSTR_LEN(stmt) == 0) {
-		zend_argument_value_error(2, "cannot be empty");
+		zend_argument_must_not_be_empty_error(2);
 		RETURN_THROWS();
 	}
 
diff --git a/ext/pgsql/tests/05large_object.phpt b/ext/pgsql/tests/05large_object.phpt
index a785b76a572..957f2dffa8e 100644
--- a/ext/pgsql/tests/05large_object.phpt
+++ b/ext/pgsql/tests/05large_object.phpt
@@ -17,6 +17,11 @@ $oid = pg_lo_create ($db);
 if (!$oid) echo ("pg_lo_create() error\n");
 $handle = pg_lo_open ($db, $oid, "w");
 if (!$handle) echo ("pg_lo_open() error\n");
+try {
+	pg_lo_write ($handle, "large\0object data");
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
 pg_lo_write ($handle, "large object data");
 pg_lo_close ($handle);
 pg_exec ($db, "COMMIT");
@@ -105,6 +110,7 @@ echo "OK";
 ?>
 --EXPECTF--
 create/write/close LO
+pg_lo_write(): Argument #2 ($data) must not contain any null bytes
 open/read/tell/seek/close LO
 string(5) "large"
 int(5)
diff --git a/ext/pgsql/tests/pg_close_stmt.phpt b/ext/pgsql/tests/pg_close_stmt.phpt
index e93108c1e7a..206ffeb0eea 100644
--- a/ext/pgsql/tests/pg_close_stmt.phpt
+++ b/ext/pgsql/tests/pg_close_stmt.phpt
@@ -18,6 +18,11 @@ $db = pg_connect($conn_str);
 $res = pg_prepare($db, 'test', $query);
 
 $res = pg_execute($db, 'test', $params_null);
+try {
+	pg_close_stmt($db, '');
+} catch (\ValueError $e) {
+	echo $e->getMessage(), PHP_EOL;
+}
 $res = pg_close_stmt($db, 'test');
 var_dump($res !== false);
 var_dump(pg_result_status($res) === PGSQL_COMMAND_OK);
@@ -29,5 +34,6 @@ pg_close($db);
 
 ?>
 --EXPECT--
+pg_close_stmt(): Argument #2 ($statement_name) must not be empty
 bool(true)
 bool(true)