Groups examples and some boolean checks corrected

examples/groups/call all.php

@@ -0,0 +1,52 @@
+ 
+ <?php
+    $title = "Calling a function on all members of the group";
+    require('../head.php');
+?>
+
+<script type="text/javascript">
+
+(function () {
+
+    var game = new Phaser.Game(800, 600, Phaser.CANVAS, '', { preload: preload, create: create,render : render });
+
+    function preload() {
+        game.load.spritesheet('item', 'assets/buttons/number-buttons-90x90.png', 90, 90);
+        game.load.image('reviveBtn', 'assets/buttons/revive-button.png');
+        
+    }
+    function create() {
+        // Add some items.
+        var item;
+        for (var i = 0; i < 3; i++) {
+            // Give the items a different alpha increase speed.
+            item = game.add.sprite(290, 98 * (i + 1), 'item', i);
+            // Enable input.
+            item.input.start(0, true);
+            item.events.onInputUp.add(kill);
+            // An item besides the left one.
+            item = game.add.sprite(388, 98 * (i + 1), 'item', i + 3);
+            item.input.start(0, true);
+            item.events.onInputUp.add(kill);
+        }
+        // Add a button to revive all the items.
+        game.add.button(270, 400, 'reviveBtn', reviveAll, this, 0, 0, 0);
+    }
+    function kill(item) {
+        item.kill();
+    }
+    function reviveAll() {
+        game.world.group.callAll('revive');
+    }
+    function render() {
+
+        game.debug.renderText('Tap or click an item to kill it, and press the revive button to revive them all.', 160, 500);
+    }
+
+})();
+
+</script>
+
+<?php
+    require('../foot.php');
+?>