[PHP] Add support for PHP7.

PHP5's C extension API has changed substantially so you need to use
-php7 to specify you want PHP7 compatible wrappers.
Fixes https://github.com/swig/swig/issues/571

Lib/php5/std_map.i

@@ -0,0 +1,76 @@
+/* -----------------------------------------------------------------------------
+ * std_map.i
+ *
+ * SWIG typemaps for std::map
+ * ----------------------------------------------------------------------------- */
+
+%include <std_common.i>
+
+// ------------------------------------------------------------------------
+// std::map
+// ------------------------------------------------------------------------
+
+%{
+#include <map>
+#include <algorithm>
+#include <stdexcept>
+%}
+
+// exported class
+
+namespace std {
+
+    template<class K, class T> class map {
+        // add typemaps here
+      public:
+        typedef size_t size_type;
+        typedef ptrdiff_t difference_type;
+        typedef K key_type;
+        typedef T mapped_type;
+        map();
+        map(const map<K,T> &);
+        
+        unsigned int size() const;
+        void clear();
+        %extend {
+            const T& get(const K& key) throw (std::out_of_range) {
+                std::map<K,T >::iterator i = self->find(key);
+                if (i != self->end())
+                    return i->second;
+                else
+                    throw std::out_of_range("key not found");
+            }
+            void set(const K& key, const T& x) {
+                (*self)[key] = x;
+            }
+            void del(const K& key) throw (std::out_of_range) {
+                std::map<K,T >::iterator i = self->find(key);
+                if (i != self->end())
+                    self->erase(i);
+                else
+                    throw std::out_of_range("key not found");
+            }
+            bool has_key(const K& key) {
+                std::map<K,T >::iterator i = self->find(key);
+                return i != self->end();
+            }
+            bool is_empty() const {
+                return self->empty();
+            }
+        }
+    };
+
+// Legacy macros (deprecated)
+%define specialize_std_map_on_key(K,CHECK,CONVERT_FROM,CONVERT_TO)
+#warning "specialize_std_map_on_key ignored - macro is deprecated and no longer necessary"
+%enddef
+
+%define specialize_std_map_on_value(T,CHECK,CONVERT_FROM,CONVERT_TO)
+#warning "specialize_std_map_on_value ignored - macro is deprecated and no longer necessary"
+%enddef
+
+%define specialize_std_map_on_both(K,CHECK_K,CONVERT_K_FROM,CONVERT_K_TO, T,CHECK_T,CONVERT_T_FROM,CONVERT_T_TO)
+#warning "specialize_std_map_on_both ignored - macro is deprecated and no longer necessary"
+%enddef
+
+}