ext/gmp: Refactor gmp_cmp() test

ext/gmp/tests/gmp_cmp.phpt

@@ -5,17 +5,27 @@ gmp
 --FILE--
 <?php
 
-var_dump(gmp_cmp(123123,-123123));
-var_dump(gmp_cmp("12345678900987654321","12345678900987654321"));
-var_dump(gmp_cmp("12345678900987654321","123456789009876543211"));
-var_dump(gmp_cmp(0,0));
-var_dump(gmp_cmp(1231222,0));
-var_dump(gmp_cmp(0,345355));
+function cmp_helper($l, $r) {
+    echo 'gmp(', var_export($l, true), ', ', var_export($r, true), '): ';
+    $r = gmp_cmp($l, $r);
+    echo match (true) {
+        $r === 0 => "equals\n",
+        $r < 0 => "right greater than left\n",
+        $r > 0 => "left greater than right\n",
+    };
+}
+
+cmp_helper(123123,-123123);
+cmp_helper("12345678900987654321","12345678900987654321");
+cmp_helper("12345678900987654321","123456789009876543211");
+cmp_helper(0,0);
+cmp_helper(1231222,0);
+cmp_helper(0,345355);
 
 $n = gmp_init("827278512385463739");
 var_dump(gmp_cmp(0,$n) < 0);
 $n1 = gmp_init("827278512385463739");
-var_dump(gmp_cmp($n1,$n));
+var_dump(gmp_cmp($n1,$n) === 0);
 
 try {
     var_dump(gmp_cmp(array(),array()));
@@ -26,13 +36,13 @@ try {
 echo "Done\n";
 ?>
 --EXPECT--
-int(1)
-int(0)
-int(-1)
-int(0)
-int(1)
-int(-1)
+gmp(123123, -123123): left greater than right
+gmp('12345678900987654321', '12345678900987654321'): equals
+gmp('12345678900987654321', '123456789009876543211'): right greater than left
+gmp(0, 0): equals
+gmp(1231222, 0): left greater than right
+gmp(0, 345355): right greater than left
+bool(true)
 bool(true)
-int(0)
 gmp_cmp(): Argument #1 ($num1) must be of type GMP|string|int, array given
 Done