Adjust PHP sync example

Make it work with how globals are actually wrapped.  It looks like
this example has never been right, but nobody noticed before PHP 8
started warning about the use of unset variables.

This reveals that handling of std::string properties needs fixing.

Examples/php/sync/example.cxx

@@ -1,13 +1,19 @@
 #include "example.h"
-#include <stdio.h>
+#include <iostream>
 
 int x = 42;
-char *s = (char *)"Test";
+std::string s = "Test";
 
-void Sync::printer(void) {
-
-	printf("The value of global s is %s\n", s);
-	printf("The value of global x is %d\n", x);
-	printf("The value of class s is %s\n", s);
-	printf("The value of class x is %d\n", x);
+void Sync::printer() {
+    std::cout << "The value of global s is " << ::s << '\n';
+    std::cout << "The value of global x is " << ::x << '\n';
+    std::cout << "The value of class s is " << this->s << '\n';
+    std::cout << "The value of class x is " << this->x << '\n';
+}
+
+void Sync::all_change() {
+	::s = "global change";
+	++::x;
+	this->s = "local change";
+	++this->x;
 }

Examples/php/sync/example.h

@@ -1,9 +1,14 @@
-extern char *s;
+#include <string>
+
+extern std::string s;
 extern int x;
 
 class Sync {
 	public:
 		int x;
-		char *s;
-		void printer(void);
+		std::string s;
+		void printer();
+		void all_change();
+
+		Sync() : x(0) { }
 };

Examples/php/sync/runme.php

@@ -1,12 +1,33 @@
 <?
 
-// Load module and PHP classes.
 include("example.php");
 
-echo "Got new object\n";
-echo "Got string $s and value $x \n";
+echo "PHP reading globals: string is '", s_get(), "' and value is ", x_get(), "\n";
 
-$s = new Sync();
+$o = new Sync();
 echo "Got new object\n";
 
-$s->printer();
+echo "PHP reading object: string is '", $o->s, "' and value is ", $o->x, "\n";
+
+$o->printer();
+
+// FIXME something is up with the setter
+// type error - s_set("global string");
+x_set(42);
+
+// FIXME something is up with the setter
+// type error - $o->s = "object string";
+$o->x = 1234;
+
+echo "PHP reading globals: string is '", s_get(), "' and value is ", x_get(), "\n";
+echo "PHP reading object: string is '", $o->s, "' and value is ", $s->x, "\n";
+
+$o->printer();
+
+echo "Calling all_change() method\n";
+$o->all_change();
+
+echo "PHP reading globals: string is '", s_get(), "' and value is ", x_get(), "\n";
+echo "PHP reading object: string is '", $o->s, "' and value is ", $o->x, "\n";
+
+$o->printer();