diff --git a/NEWS b/NEWS
index e26c9eca2fdb..b19b09c21442 100644
--- a/NEWS
+++ b/NEWS
@@ -78,6 +78,9 @@ PHP                                                                        NEWS
   . Mark Phar::buildFromIterator() base directory argument as a path.
     (ndossche)
 
+- Posix:
+  . Added validity check to the flags argument for posix_access(). (arshidkv12)
+
 - Reflection:
   . Fixed bug GH-20217 (ReflectionClass::isIterable() incorrectly returns true
     for classes with property hooks). (alexandre-daubois)
diff --git a/ext/mysqli/mysqli_api.c b/ext/mysqli/mysqli_api.c
index 77a06370cc73..7af90f665854 100644
--- a/ext/mysqli/mysqli_api.c
+++ b/ext/mysqli/mysqli_api.c
@@ -1410,10 +1410,7 @@ PHP_FUNCTION(mysqli_stmt_send_long_data)
 		RETURN_THROWS();
 	}
 
-	if (mysql_stmt_send_long_data(stmt->stmt, param_nr, data, data_len)) {
-		RETURN_FALSE;
-	}
-	RETURN_TRUE;
+	RETURN_BOOL(!mysql_stmt_send_long_data(stmt->stmt, param_nr, data, data_len));
 }
 /* }}} */
 
@@ -1552,10 +1549,7 @@ PHP_FUNCTION(mysqli_stmt_reset)
 
 	MYSQLI_FETCH_RESOURCE_STMT(stmt, mysql_stmt, MYSQLI_STATUS_VALID);
 
-	if (mysql_stmt_reset(stmt->stmt)) {
-		RETURN_FALSE;
-	}
-	RETURN_TRUE;
+	RETURN_BOOL(!mysql_stmt_reset(stmt->stmt));
 }
 /* }}} */
 
diff --git a/ext/pgsql/pgsql.c b/ext/pgsql/pgsql.c
index a3a796628bbc..4b5d9d577c5d 100644
--- a/ext/pgsql/pgsql.c
+++ b/ext/pgsql/pgsql.c
@@ -3023,10 +3023,7 @@ PHP_FUNCTION(pg_lo_export)
 
 	pgsql = link->conn;
 
-	if (lo_export(pgsql, oid, ZSTR_VAL(file_out)) == -1) {
-		RETURN_FALSE;
-	}
-	RETURN_TRUE;
+	RETURN_BOOL(lo_export(pgsql, oid, ZSTR_VAL(file_out)) != -1);
 }
 /* }}} */
 
@@ -3863,10 +3860,8 @@ PHP_FUNCTION(pg_connection_reset)
 	pgsql = link->conn;
 
 	PQreset(pgsql);
-	if (PQstatus(pgsql) == CONNECTION_BAD) {
-		RETURN_FALSE;
-	}
-	RETURN_TRUE;
+	
+	RETURN_BOOL(PQstatus(pgsql) != CONNECTION_BAD);
 }
 /* }}} */
 
diff --git a/ext/posix/posix.c b/ext/posix/posix.c
index b7acf8c75127..76e14f6ecb0c 100644
--- a/ext/posix/posix.c
+++ b/ext/posix/posix.c
@@ -744,6 +744,15 @@ PHP_FUNCTION(posix_access)
 		RETURN_FALSE;
 	}
 
+	if (mode < 0 || (mode & ~(F_OK | R_OK | W_OK | X_OK))) {
+		zend_argument_value_error(
+			2,
+			"must be a bitmask of POSIX_F_OK, POSIX_R_OK, POSIX_W_OK, and POSIX_X_OK"
+		);
+		efree(path);
+		RETURN_THROWS();
+	}
+
 	ret = access(path, mode);
 	efree(path);
 
diff --git a/ext/posix/tests/posix_access_flags.phpt b/ext/posix/tests/posix_access_flags.phpt
new file mode 100644
index 000000000000..0989e2a2bc66
--- /dev/null
+++ b/ext/posix/tests/posix_access_flags.phpt
@@ -0,0 +1,54 @@
+--TEST--
+posix_access() flag (mode) validation
+--SKIPIF--
+<?php
+if (!function_exists("posix_access")) {
+    die("skip no posix_access()");
+}
+?>
+--FILE--
+<?php
+
+$dir = __DIR__;
+$testfile = "$dir/testfile.txt";
+
+// Create a temporary file for valid access tests
+file_put_contents($testfile, "hello");
+
+try {
+    posix_access($testfile, -1);
+} catch (ValueError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+try {
+    posix_access($testfile, 01000); // S_ISVTX bit (sticky)
+} catch (ValueError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+try {
+    posix_access($testfile, 02000); // S_ISGID bit
+} catch (ValueError $e) {
+    echo $e->getMessage(), "\n";
+}
+
+if (posix_access($testfile, POSIX_R_OK | POSIX_W_OK)) {
+    echo "Read/write access OK\n";
+}
+
+if (posix_access($testfile, POSIX_F_OK)) {
+    echo "File exists OK\n";
+}
+
+?>
+--CLEAN--
+<?php
+@unlink(__DIR__ . '/testfile.txt');
+?>
+--EXPECTF--
+posix_access(): Argument #2 ($flags) must be a bitmask of POSIX_F_OK, POSIX_R_OK, POSIX_W_OK, and POSIX_X_OK
+posix_access(): Argument #2 ($flags) must be a bitmask of POSIX_F_OK, POSIX_R_OK, POSIX_W_OK, and POSIX_X_OK
+posix_access(): Argument #2 ($flags) must be a bitmask of POSIX_F_OK, POSIX_R_OK, POSIX_W_OK, and POSIX_X_OK
+Read/write access OK
+File exists OK
diff --git a/ext/standard/dns_win32.c b/ext/standard/dns_win32.c
index 1f7c6c0146e4..8caf5813395c 100644
--- a/ext/standard/dns_win32.c
+++ b/ext/standard/dns_win32.c
@@ -116,11 +116,7 @@ PHP_FUNCTION(dns_check_record)
 
 	status = DnsQuery_A(hostname, type, DNS_QUERY_STANDARD, NULL, &pResult, NULL);
 
-	if (status) {
-		RETURN_FALSE;
-	}
-
-	RETURN_TRUE;
+	RETURN_BOOL(!status);
 }
 /* }}} */
 
diff --git a/ext/standard/file.c b/ext/standard/file.c
index bd6ee252875e..a7b73f1fe56e 100644
--- a/ext/standard/file.c
+++ b/ext/standard/file.c
@@ -1016,10 +1016,8 @@ PHPAPI PHP_FUNCTION(fflush)
 	ZEND_PARSE_PARAMETERS_END();
 
 	ret = php_stream_flush(stream);
-	if (ret) {
-		RETURN_FALSE;
-	}
-	RETURN_TRUE;
+
+	RETURN_BOOL(!ret);
 }
 /* }}} */
 
@@ -1032,10 +1030,7 @@ PHPAPI PHP_FUNCTION(rewind)
 		PHP_Z_PARAM_STREAM(stream)
 	ZEND_PARSE_PARAMETERS_END();
 
-	if (-1 == php_stream_rewind(stream)) {
-		RETURN_FALSE;
-	}
-	RETURN_TRUE;
+	RETURN_BOOL(-1 != php_stream_rewind(stream));
 }
 /* }}} */
 
diff --git a/win32/signal.c b/win32/signal.c
index 49a7c1cc0c91..89548a2405c4 100644
--- a/win32/signal.c
+++ b/win32/signal.c
@@ -131,10 +131,7 @@ PHP_FUNCTION(sapi_windows_set_ctrl_handler)
 	if (!ZEND_FCI_INITIALIZED(fci)) {
 		zval_ptr_dtor(&ctrl_handler);
 		ZVAL_UNDEF(&ctrl_handler);
-		if (!SetConsoleCtrlHandler(NULL, add)) {
-			RETURN_FALSE;
-		}
-		RETURN_TRUE;
+		RETURN_BOOL(SetConsoleCtrlHandler(NULL, add));
 	}
 
 	if (!SetConsoleCtrlHandler(NULL, FALSE) || !SetConsoleCtrlHandler(php_win32_signal_system_ctrl_handler, add)) {