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diff --git a/ext/standard/tests/array/array_push_variation6.phpt b/ext/standard/tests/array/array_push_variation6.phpt
new file mode 100644
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+++ b/ext/standard/tests/array/array_push_variation6.phpt
@@ -0,0 +1,159 @@
+--TEST--
+Test array_push() function : usage variations - array keys are different data types
+--FILE--
+<?php
+/* Prototype  : int array_push(array $stack, mixed $var [, mixed $...])
+ * Description: Pushes elements onto the end of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Pass array_push arrays where the keys are different data types.
+ */
+
+echo "*** Testing array_push() : usage variations ***\n";
+
+// Initialise function arguments not being substituted
+$var = 'value';
+
+//get an unset variable
+$unset_var = 10;
+unset ($unset_var);
+
+// heredoc string
+$heredoc = <<<EOT
+hello world
+EOT;
+
+// arrays of different data types as keys to be passed to $stack argument
+$inputs = array(
+
+       // int data
+/*1*/  'int' => array(
+       0 => 'zero',
+       1 => 'one',
+       12345 => 'positive',
+       -2345 => 'negative',
+       ),
+
+       // float data
+/*2*/  'float' => array(
+       10.5 => 'positive',
+       -10.5 => 'negative',
+       .5 => 'half',
+       ),
+       
+       'extreme floats' => array(
+       12.3456789000e10 => 'large',
+       12.3456789000E-10 => 'small',
+       ),
+
+       // null data
+/*3*/ 'null uppercase' => array(
+       NULL => 'null 1',
+       ), 
+       'null lowercase' => array(
+       null => 'null 2',
+       ),
+
+       // boolean data
+/*4*/ 'bool lowercase' => array(
+       true => 'lowert',
+       false => 'lowerf',
+       ),
+       'bool uppercase' => array(
+       TRUE => 'uppert',
+       FALSE => 'upperf',
+       ),
+       
+       // empty data
+/*5*/ 'empty double quotes' => array(
+       "" => 'emptyd',
+       ),
+       'empty single quotes' => array(
+       '' => 'emptys',
+       ),
+
+       // string data
+/*6*/ 'string' => array(
+       "stringd" => 'stringd',
+       'strings' => 'strings',
+       $heredoc => 'stringh',
+       ),
+
+       // undefined data
+/*8*/ 'undefined' => array(
+       @$undefined_var => 'undefined',
+       ),
+
+       // unset data
+/*9*/ 'unset' => array(
+       @$unset_var => 'unset',
+       ),
+);
+
+// loop through each sub-array of $inputs to check the behavior of array_push()
+$iterator = 1;
+foreach($inputs as $key => $input) {
+  echo "\n-- Iteration $iterator : $key data --\n";
+  echo "Before : ";
+  var_dump(count($input));
+  echo "After  : ";
+  var_dump( array_push($input, $var) );
+  $iterator++;
+};
+
+echo "Done";
+?>
+
+--EXPECTF--
+*** Testing array_push() : usage variations ***
+
+-- Iteration 1 : int data --
+Before : int(4)
+After  : int(5)
+
+-- Iteration 2 : float data --
+Before : int(3)
+After  : int(4)
+
+-- Iteration 3 : extreme floats data --
+Before : int(2)
+After  : int(3)
+
+-- Iteration 4 : null uppercase data --
+Before : int(1)
+After  : int(2)
+
+-- Iteration 5 : null lowercase data --
+Before : int(1)
+After  : int(2)
+
+-- Iteration 6 : bool lowercase data --
+Before : int(2)
+After  : int(3)
+
+-- Iteration 7 : bool uppercase data --
+Before : int(2)
+After  : int(3)
+
+-- Iteration 8 : empty double quotes data --
+Before : int(1)
+After  : int(2)
+
+-- Iteration 9 : empty single quotes data --
+Before : int(1)
+After  : int(2)
+
+-- Iteration 10 : string data --
+Before : int(3)
+After  : int(4)
+
+-- Iteration 11 : undefined data --
+Before : int(1)
+After  : int(2)
+
+-- Iteration 12 : unset data --
+Before : int(1)
+After  : int(2)
+Done