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diff --git a/ext/date/tests/DateTime_modify_variation1.phpt b/ext/date/tests/DateTime_modify_variation1.phpt
new file mode 100644
index 0000000..faeb70c
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+++ b/ext/date/tests/DateTime_modify_variation1.phpt
@@ -0,0 +1,262 @@
+--TEST--
+Test DateTime::modify() function : usage variation - Passing unexpected values to first argument $modify.
+--FILE--
+<?php
+/* Prototype  : public DateTime DateTime::modify  ( string $modify  )
+ * Description: Alter the timestamp of a DateTime object by incrementing or decrementing in a format accepted by strtotime(). 
+ * Source code: ext/date/php_date.c
+ * Alias to functions: public date_modify()
+ */
+
+echo "*** Testing DateTime::modify() : usage variation -  unexpected values to first argument \$modify***\n";
+
+//Set the default time zone 
+date_default_timezone_set("Europe/London");
+
+//get an unset variable
+$unset_var = 10;
+unset ($unset_var);
+
+// define some classes
+class classWithToString
+{
+	public function __toString() {
+		return "Class A object";
+	}
+}
+
+class classWithoutToString
+{
+}
+
+// heredoc string
+$heredoc = <<<EOT
+hello world
+EOT;
+
+// add arrays
+$index_array = array (1, 2, 3);
+$assoc_array = array ('one' => 1, 'two' => 2);
+
+// resource
+$file_handle = fopen(__FILE__, 'r');
+
+//array of values to iterate over
+$inputs = array(
+
+      // int data
+      'int 0' => 0,
+      'int 1' => 1,
+      'int 12345' => 12345,
+      'int -12345' => -12345,
+
+      // float data
+      'float 10.5' => 10.5,
+      'float -10.5' => -10.5,
+      'float .5' => .5,
+
+      // array data
+      'empty array' => array(),
+      'int indexed array' => $index_array,
+      'associative array' => $assoc_array,
+      'nested arrays' => array('foo', $index_array, $assoc_array),
+
+      // null data
+      'uppercase NULL' => NULL,
+      'lowercase null' => null,
+
+      // boolean data
+      'lowercase true' => true,
+      'lowercase false' =>false,
+      'uppercase TRUE' =>TRUE,
+      'uppercase FALSE' =>FALSE,
+
+      // empty data
+      'empty string DQ' => "",
+      'empty string SQ' => '',
+
+      // string data
+      'string DQ' => "string",
+      'string SQ' => 'string',
+      'mixed case string' => "sTrInG",
+      'heredoc' => $heredoc,
+
+      // object data
+      'instance of classWithToString' => new classWithToString(),
+      'instance of classWithoutToString' => new classWithoutToString(),
+
+      // undefined data
+      'undefined var' => @$undefined_var,
+
+      // unset data
+      'unset var' => @$unset_var,
+      
+      // resource 
+      'resource' => $file_handle
+);
+
+$object = new DateTime("2009-01-31 14:28:41");
+
+foreach($inputs as $variation =>$format) {
+      echo "\n-- $variation --\n";
+      var_dump( $object->modify($format) );
+};
+
+// closing the resource
+fclose( $file_handle );
+
+?>
+===DONE===
+--EXPECTF--
+*** Testing DateTime::modify() : usage variation -  unexpected values to first argument $modify***
+
+-- int 0 --
+
+Warning: DateTime::modify(): Failed to parse time string (0) at position 0 (0): Unexpected character in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- int 1 --
+
+Warning: DateTime::modify(): Failed to parse time string (1) at position 0 (1): Unexpected character in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- int 12345 --
+
+Warning: DateTime::modify(): Failed to parse time string (12345) at position 4 (5): Unexpected character in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- int -12345 --
+
+Warning: DateTime::modify(): Failed to parse time string (-12345) at position 5 (5): Unexpected character in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- float 10.5 --
+object(DateTime)#3 (3) {
+  ["date"]=>
+  string(19) "2009-01-31 10:05:00"
+  ["timezone_type"]=>
+  int(3)
+  ["timezone"]=>
+  string(13) "Europe/London"
+}
+
+-- float -10.5 --
+
+Warning: DateTime::modify(): Failed to parse time string (-10.5) at position 4 (5): Unexpected character in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- float .5 --
+object(DateTime)#3 (3) {
+  ["date"]=>
+  string(19) "2009-01-31 00:05:00"
+  ["timezone_type"]=>
+  int(3)
+  ["timezone"]=>
+  string(13) "Europe/London"
+}
+
+-- empty array --
+
+Warning: DateTime::modify() expects parameter 1 to be string, array given in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- int indexed array --
+
+Warning: DateTime::modify() expects parameter 1 to be string, array given in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- associative array --
+
+Warning: DateTime::modify() expects parameter 1 to be string, array given in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- nested arrays --
+
+Warning: DateTime::modify() expects parameter 1 to be string, array given in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- uppercase NULL --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- lowercase null --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- lowercase true --
+
+Warning: DateTime::modify(): Failed to parse time string (1) at position 0 (1): Unexpected character in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- lowercase false --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- uppercase TRUE --
+
+Warning: DateTime::modify(): Failed to parse time string (1) at position 0 (1): Unexpected character in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- uppercase FALSE --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- empty string DQ --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- empty string SQ --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- string DQ --
+
+Warning: DateTime::modify(): Failed to parse time string (string) at position 0 (s): The timezone could not be found in the database in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- string SQ --
+
+Warning: DateTime::modify(): Failed to parse time string (string) at position 0 (s): The timezone could not be found in the database in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- mixed case string --
+
+Warning: DateTime::modify(): Failed to parse time string (sTrInG) at position 0 (s): The timezone could not be found in the database in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- heredoc --
+
+Warning: DateTime::modify(): Failed to parse time string (hello world) at position 0 (h): The timezone could not be found in the database in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- instance of classWithToString --
+
+Warning: DateTime::modify(): Failed to parse time string (Class A object) at position 0 (C): The timezone could not be found in the database in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- instance of classWithoutToString --
+
+Warning: DateTime::modify() expects parameter 1 to be string, object given in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- undefined var --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- unset var --
+
+Warning: DateTime::modify(): Failed to parse time string () at position 0 ( in %sDateTime_modify_variation1.php on line 99
+bool(false)
+
+-- resource --
+
+Warning: DateTime::modify() expects parameter 1 to be string, resource given in %sDateTime_modify_variation1.php on line 99
+bool(false)
+===DONE===