Ider · March 3, 2014 19:36 · Mar 3, 2014
diff --git a/idx.php b/idx.php
@@ -0,0 +1,64 @@
+/**
+ * Get value from $array with index or indics given by $keyOrKeys.
+ * @param  array $array     The array to get value from.
+ * @param  mixed $keyOrKeys A single key, or a numeric array that contains multiple keys
+ *                          to fetch from multidimensional array.
+ *                          Key cound be either numeric or string.
+ *                          If emtpy array given, the original $array will be returned.
+ * @param  mixed $default   The default value to be returned if the array dose not contain
+ *                          given key or midway value is not array type.
+ * @return mixed            The value that associated in $array.
+ */
+function idx($array, $keyOrKeys, $default = null) {
+    if (!is_array($keyOrKeys)) {
+        $key = $keyOrKeys;
+        return isset($array[$key])? $array[$key] : $default;
+    }
+
+    $keys = $keyOrKeys;
+    $count = count($keys);
+
+    $i = 0;
+    while ($i < $count && is_array($array)) {
+        $key = $keys[$i];
+        if (!isset($array[$key])) {
+            break;
+        }
+        $array = $array[$key];
+        $i++;
+    }
+
+    if ($i == $count) {
+        return $array;
+    }
+
+    return $default;
+}
+
+
+/*
+function idxTEST() {
+    $a = array(0,1,2,3,4, 
+        'hello' => 'world', 
+        'a' => array(0,1,2,3,4,
+                'welcome' => 'back'
+            ),
+        );
+    echo '<pre>';
+    // Test on single-index
+    var_dump(idx($a, 0)); // 0
+    var_dump(idx($a, 7)); // null
+    var_dump(idx($a, 7, 7)); // 7
+    var_dump(idx($a, 'hello')); // world
+
+    // Test on multi-index
+    var_dump(idx($a, array('a', 0))); // 0
+    var_dump(idx($a, array('a', 7), 7)); // 7
+    var_dump(idx($a, array('a', 'welcome'))); // back
+
+
+    echo '</pre>';
+}
+
+idxTEST();
+*/