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lib/compat/is_callable.php

@@ -0,0 +1,53 @@
+<?php
+/**
+ * Replace function is_callable()
+ *
+ * @category    PHP
+ * @package     PHP_Compat
+ * @link        http://php.net/function.is_callable
+ * @author      Gaetano Giunta <giunta.gaetano@sea-aeroportimilano.it>
+ * @version     $Id: is_callable.php,v 1.3 2006/08/21 14:03:15 ggiunta Exp $
+ * @since       PHP 4.0.6
+ * @require     PHP 4.0.0 (true, false, etc...)
+ * @todo        add the 3rd parameter syntax...
+ */
+if (!function_exists('is_callable')) {
+    function is_callable($var, $syntax_only=false)
+    {
+        if ($syntax_only)
+        {
+            /* from The Manual:
+            * If the syntax_only argument is TRUE the function only verifies
+            * that var might be a function or method. It will only reject simple
+            * variables that are not strings, or an array that does not have a
+            * valid structure to be used as a callback. The valid ones are
+            * supposed to have only 2 entries, the first of which is an object
+            * or a string, and the second a string
+            */
+            return (is_string($var) || (is_array($var) && count($var) == 2 && is_string(end($var)) && (is_string(reset($var)) || is_object(reset($var)))));
+        }
+        else
+        {
+            if (is_string($var))
+            {
+                return function_exists($var);
+            }
+            else if (is_array($var) && count($var) == 2 && is_string($method = end($var)))
+            {
+                $obj = reset($var);
+                if (is_string($obj))
+                {
+                    $methods = get_class_methods($obj);
+                    return (bool)(is_array($methods) && in_array(strtolower($method), $methods));
+                }
+                else if (is_object($obj))
+                {
+                    return method_exists($obj, $method);
+                }
+            }
+            return false;
+        }
+    }
+}
+
+?>