Mark rand/mt_rand args as UNKNOWN

The second argument should be mt_getrandmax(), not PHP_INT_MAX.
Additionally this function only accepts either zero or two arguments,
so err on the side of being conservative and mark both UNKNOWN.

Author: nikic

ext/standard/basic_functions.stub.php

@@ -1194,9 +1194,9 @@ 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 = 0, int $max = PHP_INT_MAX): int {}
+function rand(int $min = UNKNOWN, int $max = UNKNOWN): int {}
 
-function mt_rand(int $min = 0, int $max = PHP_INT_MAX): int {}
+function mt_rand(int $min = UNKNOWN, int $max = UNKNOWN): int {}
 
 function mt_getrandmax(): int {}
 

ext/standard/basic_functions_arginfo.h

@@ -1827,8 +1827,8 @@ 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_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_ARG_TYPE_INFO(0, min, IS_LONG, 0)
+	ZEND_ARG_TYPE_INFO(0, max, IS_LONG, 0)
 ZEND_END_ARG_INFO()
 
 #define arginfo_mt_rand arginfo_rand