diff --git a/ext/standard/basic_functions.stub.php b/ext/standard/basic_functions.stub.php
index 0bc7bd8aef754..2a5e5de723c08 100755
--- a/ext/standard/basic_functions.stub.php
+++ b/ext/standard/basic_functions.stub.php
@@ -1182,9 +1182,9 @@ function mt_srand(int $seed = 0, int $mode = MT_RAND_MT19937): void {}
 /** @alias mt_srand */
 function srand(int $seed = 0, int $mode = MT_RAND_MT19937): void {}
 
-function rand(int $min = UNKNOWN, int $max = UNKNOWN): int {}
+function rand(int $min = 0, int $max = PHP_INT_MAX): int {}
 
-function mt_rand(int $min = UNKNOWN, int $max = UNKNOWN): int {}
+function mt_rand(int $min = 0, int $max = PHP_INT_MAX): int {}
 
 function mt_getrandmax(): int {}
 
diff --git a/ext/standard/basic_functions_arginfo.h b/ext/standard/basic_functions_arginfo.h
index 6aff74adcfd3a..04fe11a7f6406 100644
--- a/ext/standard/basic_functions_arginfo.h
+++ b/ext/standard/basic_functions_arginfo.h
@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 3c02183529eed2eb21d801ed2ba615deaf749b1d */
+ * Stub hash: 131f77fd51f0d9b5e0354c6e30da6abd29d4fa47 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_set_time_limit, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, seconds, IS_LONG, 0)
@@ -1823,8 +1823,8 @@ ZEND_END_ARG_INFO()
 #define arginfo_srand arginfo_mt_srand
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_rand, 0, 0, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, min, IS_LONG, 0)
-	ZEND_ARG_TYPE_INFO(0, max, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, min, IS_LONG, 0, "0")
+	ZEND_ARG_TYPE_INFO_WITH_DEFAULT_VALUE(0, max, IS_LONG, 0, "PHP_INT_MAX")
 ZEND_END_ARG_INFO()
 
 #define arginfo_mt_rand arginfo_rand
diff --git a/ext/standard/mt_rand.c b/ext/standard/mt_rand.c
index 3c33a42df3f66..1610b9e623fea 100644
--- a/ext/standard/mt_rand.c
+++ b/ext/standard/mt_rand.c
@@ -303,8 +303,8 @@ PHPAPI zend_long php_mt_rand_common(zend_long min, zend_long max)
 /* {{{ Returns a random number from Mersenne Twister */
 PHP_FUNCTION(mt_rand)
 {
-	zend_long min;
-	zend_long max;
+	zend_long min = 0;
+	zend_long max = ZEND_LONG_MAX;
 	int argc = ZEND_NUM_ARGS();
 
 	if (argc == 0) {
@@ -312,7 +312,8 @@ PHP_FUNCTION(mt_rand)
 		RETURN_LONG(php_mt_rand() >> 1);
 	}
 
-	ZEND_PARSE_PARAMETERS_START(2, 2)
+	ZEND_PARSE_PARAMETERS_START(0, 2)
+		Z_PARAM_OPTIONAL
 		Z_PARAM_LONG(min)
 		Z_PARAM_LONG(max)
 	ZEND_PARSE_PARAMETERS_END();
diff --git a/ext/standard/rand.c b/ext/standard/rand.c
index fd063b70044f5..e450d9120a08f 100644
--- a/ext/standard/rand.c
+++ b/ext/standard/rand.c
@@ -43,15 +43,16 @@ PHPAPI zend_long php_rand(void)
 /* {{{ Returns a random number from Mersenne Twister */
 PHP_FUNCTION(rand)
 {
-	zend_long min;
-	zend_long max;
+	zend_long min = 0;
+	zend_long max = ZEND_LONG_MAX;
 	int argc = ZEND_NUM_ARGS();
 
 	if (argc == 0) {
 		RETURN_LONG(php_mt_rand() >> 1);
 	}
 
-	ZEND_PARSE_PARAMETERS_START(2, 2)
+	ZEND_PARSE_PARAMETERS_START(0, 2)
+		Z_PARAM_OPTIONAL
 		Z_PARAM_LONG(min)
 		Z_PARAM_LONG(max)
 	ZEND_PARSE_PARAMETERS_END();