JS like trickery in PHP, discover generic object in PHP

2 files changed, 96 insertions, 7 deletions

diff --git a/oo/blank_object.php b/oo/blank_object.php
new file mode 100644
index 0000000..25803d0
--- /dev/null
+++ b/oo/blank_object.php
@@ -0,0 +1,10 @@
+<?php
+
+/* stdClass is the default PHP object. stdClass has no properties, methods or parent.
+ * It does not support magic methods, and implements no interfaces.
+ * When you cast a scalar or array as Object, you get an instance of stdClass. Bare bones data structure for key-val entries
+ */
+
+$obj = new StdClass();
+$obj->foo = 'bar';
+
diff --git a/oo/magic_methods.php b/oo/magic_methods.php
index 8d9da79..ecfe70f 100644
--- a/oo/magic_methods.php
+++ b/oo/magic_methods.php
@@ -1,16 +1,95 @@
 <?php
 
-abstract class Base {
-    protected $arr;
+/* overloading in php refers to dynamically create undeclared data members at
+ * runtime, resulting JS style ability to assign properties to an object
+ * via -> operator, this is done by use of __set and __get magic methods, also
+ * it is possible to bypass data members access levels this way
+ *
+ * __call is used to resolve call to undefined/protected/private methods, or
+ * to perform clever yet ugly error handling
+ *
+ * http://www.php.net/manual/en/language.oop5.overloading.php
+ *
+ */
+
+error_reporting(E_ALL | E_STRICT);
+
+class Base {
+    protected $data;
 
     function __construct() {
-        echo 'dispatching ctor';
-        $this->arr = array();
+        $this->data = array();
+    }
+
+    /* gets called upon unresolved setter */
+    public function __set($key, $val) {
+        if (!is_a($val, 'Closure'))
+            print "calling __set('$key','$val')" . PHP_EOL;
+        $this->data[$key] = $val;
+    }
+
+    /* gets called upon unresolved getter */
+    public function __get($key) {
+        print "calling __get('$key')" . PHP_EOL;
+        if (array_key_exists($key, $this->data)) {
+            return $this->data[$key];
+        }
+
+        $trace = debug_backtrace();
+        trigger_error(
+            'Undefined property via __get(): ' . $key .
+            ' in ' . $trace[0]['file'] .
+            ' on line ' . $trace[0]['line'],
+            E_USER_NOTICE);
+        return null;
+    }
+
+    /* http://www.phpied.com/javascript-style-object-literals-in-php/ */
+    function __call($name, $args) {
+        if (is_callable($this->$name)) {
+            array_unshift($args, $this);
+            return call_user_func_array($this->$name, $args);
+        }
+
+        return null;
+    }
+
+    /**  As of PHP 5.1.0  */
+    public function __isset($key)
+    {
+        echo "Is '$key' set?\n";
+        return isset($this->data[$key]);
+    }
+
+    /**  As of PHP 5.1.0  */
+    public function __unset($key)
+    {
+        echo "Unsetting '$key'\n";
+        unset($this->data[$key]);
     }
 
-    abstract protected function foo();
 }
 
-class Derived extends Base {
+echo "<pre>\n";
+
+$obj = new Base();
+
+$obj->a = 1;
+echo $obj->a . "\n\n";
+
+var_dump(isset($obj->a));
+unset($obj->a);
+var_dump(isset($obj->a));
+echo "\n";
+
+
+/* JS like ability to assign a function to a property */
+$obj->foo = function () {
+    print "hello, world! from method created at runtime!" . PHP_EOL;
+};
+$obj->foo();
+
+
+echo '</pre>'
 
-}
\ No newline at end of file
+?>