[php] Implement native iterator on arrays

std/php/_std/Array.hx

@@ -25,7 +25,7 @@ import php.*;
 using php.Global;
 
 @:coreApi
-final class Array<T> implements ArrayAccess<Int, T> {
+final class Array<T> implements ArrayAccess<Int, T> implements NativeIterator<Int, T> {
 	public var length(default, null):Int;
 
 	var arr:NativeIndexedArray<T>;
@@ -228,6 +228,31 @@ final class Array<T> implements ArrayAccess<Int, T> {
 		}
 	}
 
+	@:noCompletion @:keep
+	function current():T {
+		return Global.current(arr);
+	}
+
+	@:noCompletion @:keep
+	function key():Int {
+		return Global.key($this->arr);
+	}
+
+	@:noCompletion @:keep
+	function next() {
+		return Global.next($this->arr);
+	}
+
+	@:noCompletion @:keep
+	function rewind() {
+		return Global.reset($this->arr);
+	}
+
+	@:noCompletion @:keep
+	function valid() {
+		return length > 0 && Global.key(arr) != null;
+	}
+
 	static function wrap<T>(arr:NativeIndexedArray<T>):Array<T> {
 		var a = new Array();
 		a.arr = arr;
@@ -273,3 +298,12 @@ private extern interface ArrayAccess<K, V> {
 	private function offsetSet(offset:K, value:V):Void;
 	private function offsetUnset(offset:K):Void;
 }
+
+@:native('Iterator')
+private extern interface NativeIterator<K, V> {
+	private function current():V;
+	private function key():K;
+	private function next():Void;
+	private function rewind():Void;
+	private function valid():Bool;
+}