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diff --git a/ext/standard/tests/array/array_diff_key_variation1.phpt b/ext/standard/tests/array/array_diff_key_variation1.phpt
new file mode 100644
index 000000000..00da7afa9
--- /dev/null
+++ b/ext/standard/tests/array/array_diff_key_variation1.phpt
@@ -0,0 +1,89 @@
+--TEST--
+array_diff_key() : type variations 
+--FILE--
+<?php
+/*
+* proto array array_diff_key(array arr1, array arr2 [, array ...])
+* Function is implemented in ext/standard/array.c
+*/
+/*
+* Testing how array_diff_key treats keys that are numbers, floating point numbers or strings.
+*/
+$arr1 = array(1 => 'a', 2 => 'b', 3 => 'c', 'key1' => 'value');
+$arr2 = array(1.00 => 'a', 2.00 => 'b', 3.00 => 'c', 'key2' => 'value');
+$arr3 = array('1' => 'a', '2' => 'b', '3' => 'c', 'key3' => 'value');
+$arr4 = array('1.00' => 'a', '2.00' => 'b', '3.00' => 'c', 'key4' => 'value'); //$arr4 looks different to the other three arrays.
+print "Result of comparing integers and floating point value:\n"; //1 and 1.00 are treated as the same thing
+print_r(array_diff_key($arr1, $arr2));
+print_r(array_diff_key($arr2, $arr1));
+print "Result of comparing integers and strings containing an integers:\n"; //1 and the string 1 are treated as the same thing
+print_r(array_diff_key($arr1, $arr3));
+print_r(array_diff_key($arr3, $arr1));
+print "Result of comparing integers and strings containing floating points:\n"; //1 and the string 1.00 are not treated as the same thing
+print_r(array_diff_key($arr1, $arr4));
+print_r(array_diff_key($arr4, $arr1));
+print "Result of comparing floating points and strings containing integers:\n";
+print_r(array_diff_key($arr2, $arr3)); //1.00 and the string 1 are treated as the same thing
+print_r(array_diff_key($arr3, $arr2));
+print "Result of comparing strings containing integers and strings containing floating points:\n"; //the strings 1 and 1.00 are not treated as the same thing.
+print_r(array_diff_key($arr3, $arr4));
+print_r(array_diff_key($arr4, $arr3));
+?>
+--EXPECTF--
+Result of comparing integers and floating point value:
+Array
+(
+    [key1] => value
+)
+Array
+(
+    [key2] => value
+)
+Result of comparing integers and strings containing an integers:
+Array
+(
+    [key1] => value
+)
+Array
+(
+    [key3] => value
+)
+Result of comparing integers and strings containing floating points:
+Array
+(
+    [1] => a
+    [2] => b
+    [3] => c
+    [key1] => value
+)
+Array
+(
+    [1.00] => a
+    [2.00] => b
+    [3.00] => c
+    [key4] => value
+)
+Result of comparing floating points and strings containing integers:
+Array
+(
+    [key2] => value
+)
+Array
+(
+    [key3] => value
+)
+Result of comparing strings containing integers and strings containing floating points:
+Array
+(
+    [1] => a
+    [2] => b
+    [3] => c
+    [key3] => value
+)
+Array
+(
+    [1.00] => a
+    [2.00] => b
+    [3.00] => c
+    [key4] => value
+)