add a test with gmp and PHP_INT_MAX

Author: weltling

ext/gmp/tests/gmp_php_int_max.phpt

@@ -0,0 +1,26 @@
+--TEST--
+PHP_INT_MAX tests
+--SKIPIF--
+<?php if (!extension_loaded("gmp")) print "skip"; ?>
+--FILE--
+<?php
+
+var_dump(gmp_mul(PHP_INT_MAX, PHP_INT_MAX));
+var_dump(gmp_add(PHP_INT_MAX, PHP_INT_MAX));
+var_dump(gmp_mul(PHP_INT_MAX, PHP_INT_MIN));
+?>
+DONE
+--EXPECTF--
+object(GMP)#%d (%d) {
+  ["num"]=>
+  string(38) "85070591730234615847396907784232501249"
+}
+object(GMP)#%d (%d) {
+  ["num"]=>
+  string(20) "18446744073709551614"
+}
+object(GMP)#%d (%d) {
+  ["num"]=>
+  string(39) "-85070591730234615856620279821087277056"
+}
+DONE