new testcases for array_unique() function

ext/standard/tests/array/array_unique_basic.phpt

@@ -0,0 +1,48 @@
+--TEST--
+Test array_unique() function : basic functionality 
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+echo "*** Testing array_unique() : basic functionality ***\n";
+
+// array with default keys
+$input = array(1, 2, "1", '2');
+var_dump( array_unique($input) );
+
+// associative array
+$input = array("1" => "one", 1 => "one", 2 => "two", '2' => "two");
+var_dump( array_unique($input) );
+
+// mixed array
+$input = array("1" => "one", "two", "one", 2 => "two", "three");
+var_dump( array_unique($input) );
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : basic functionality ***
+array(2) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(2)
+}
+array(2) {
+  [1]=>
+  string(3) "one"
+  [2]=>
+  string(3) "two"
+}
+array(3) {
+  [1]=>
+  string(3) "one"
+  [2]=>
+  string(3) "two"
+  [4]=>
+  string(5) "three"
+}
+Done

ext/standard/tests/array/array_unique_error.phpt

@@ -0,0 +1,36 @@
+--TEST--
+Test array_unique() function : error conditions 
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+echo "*** Testing array_unique() : error conditions ***\n";
+
+// Zero arguments
+echo "\n-- Testing array_unique() function with zero arguments --\n";
+var_dump( array_unique() );
+
+//Test array_unique with one more than the expected number of arguments
+echo "\n-- Testing array_unique() function with more than expected no. of arguments --\n";
+$input = array(1, 2);
+$extra_arg = 10;
+var_dump( array_unique($input, $extra_arg) );
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : error conditions ***
+
+-- Testing array_unique() function with zero arguments --
+
+Warning: array_unique() expects exactly 1 parameter, 0 given in %s on line %d
+NULL
+
+-- Testing array_unique() function with more than expected no. of arguments --
+
+Warning: array_unique() expects exactly 1 parameter, 2 given in %s on line %d
+NULL
+Done

ext/standard/tests/array/array_unique_variation1.phpt

@@ -0,0 +1,194 @@
+--TEST--
+Test array_unique() function : usage variations - unexpected values for 'input' argument
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+ * Passing non array values to 'input' argument of array_unique() and see 
+ * that the function outputs proper warning messages wherever expected.
+*/
+
+echo "*** Testing array_unique() : Passing non array values to \$input argument ***\n";
+
+//get an unset variable
+$unset_var = 10;
+unset($unset_var);
+
+// get a class
+class classA
+{
+  public function __toString() {
+    return "Class A object";
+  }
+}
+
+// heredoc string
+$heredoc = <<<EOT
+hello world
+EOT;
+
+// get a resource variable
+$fp = fopen(__FILE__, "r");
+
+// unexpected values to be passed to $input argument
+$inputs = array (
+
+       // int data
+/*1*/  0,
+       1,
+       12345,
+       -2345,
+
+       // float data
+/*5*/  10.5,
+       -10.5,
+       12.3456789000e10,
+       12.3456789000E-10,
+       .5,
+
+       // null data
+/*10*/ NULL,
+       null,
+
+       // boolean data
+/*12*/ true,
+       false,
+       TRUE,
+       FALSE,
+
+       // empty data
+/*16*/ "",
+       '',
+
+       // string data
+/*18*/ "string",
+       'string',
+       $heredoc,
+
+       // object data
+/*21*/ new classA(),
+
+       // undefined data
+/*22*/ @$undefined_var,
+
+       // unset data
+/*23*/ @$unset_var,
+
+       // resource variable
+/*24*/ $fp
+);
+
+// loop through each element of $inputs and check the behavior of array_unique()
+$iterator = 1;
+foreach($inputs as $input) {
+  echo "-- Iteration $iterator --\n";
+  var_dump( array_unique($input) );
+  $iterator++;
+}
+
+fclose($fp);
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : Passing non array values to $input argument ***
+-- Iteration 1 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 2 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 3 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 4 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 5 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 6 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 7 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 8 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 9 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 10 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 11 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 12 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 13 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 14 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 15 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 16 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 17 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 18 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 19 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 20 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 21 --
+array(0) {
+}
+-- Iteration 22 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 23 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+-- Iteration 24 --
+
+Warning: array_unique(): The argument should be an array in %s on line %d
+bool(false)
+Done

ext/standard/tests/array/array_unique_variation2.phpt

@@ -0,0 +1,234 @@
+--TEST--
+Test array_unique() function : usage variations - different arrays for 'input' argument
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+* Passing different arrays to $input argument and testing whether
+* array_unique() behaves in an expected way.
+*/
+
+echo "*** Testing array_unique() : Passing different arrays to \$input argument ***\n";
+
+/* Different heredoc strings passed as argument to arrays */
+// heredoc with blank line
+$blank_line = <<<EOT
+
+
+EOT;
+
+// heredoc with multiline string
+$multiline_string = <<<EOT
+hello world
+The quick brown fox jumped over;
+the lazy dog
+This is a double quoted string
+EOT;
+
+// heredoc with diferent whitespaces
+$diff_whitespaces = <<<EOT
+hello\r world\t
+1111\t\t != 2222\v\v
+heredoc\ndouble quoted string. with\vdifferent\fwhite\vspaces
+EOT;
+
+// heredoc with quoted strings and numeric values
+$numeric_string = <<<EOT
+11 < 12. 123 >22
+'single quoted string'
+"double quoted string"
+2222 != 1111.\t 0000 = 0000\n
+EOT;
+
+// arrays passed to $input argument
+$inputs = array (
+/*1*/  array(1, 2, 2, 1), // with default keys and numeric values
+       array(1.1, 2.2, 1.1), // with default keys & float values
+       array(false, true, false), // with default keys and boolean values
+       array(), // empty array
+/*5*/  array(NULL, null), // with NULL
+       array("a\v\f", "aaaa\r", "b", "aaaa\r", "\[\]\!\@\#\$\%\^\&\*\(\)\{\}"),  // with double quoted strings
+       array('a\v\f', 'aaaa\r', 'b', 'aaaa\r', '\[\]\!\@\#\$\%\^\&\*\(\)\{\}'),  // with single quoted strings
+       array("h1" => $blank_line, "h2" => $multiline_string, "h3" => $diff_whitespaces, $blank_line),  // with heredocs
+
+       // associative arrays
+/*9*/  array(1 => "one", 2 => "two", 2 => "two"),  // explicit numeric keys, string values
+       array("one" => 1, "two" => 2, "1" => 1 ),  // string keys & numeric values
+       array( 1 => 10, 2 => 20, 4 => 40, 5 => 10),  // explicit numeric keys and numeric values
+       array( "one" => "ten", "two" => "twenty", "10" => "ten"),  // string key/value
+       array("one" => 1, 2 => "two", 4 => "four"),  //mixed
+
+       // associative array, containing null/empty/boolean values as key/value
+/*14*/ array(NULL => "NULL", null => "null", "NULL" => NULL, "null" => null),
+       array(true => "true", false => "false", "false" => false, "true" => true),
+       array("" => "emptyd", '' => 'emptys', "emptyd" => "", 'emptys' => ''),
+       array(1 => '', 2 => "", 3 => NULL, 4 => null, 5 => false, 6 => true),
+/*18*/ array('' => 1, "" => 2, NULL => 3, null => 4, false => 5, true => 6),
+);
+
+// loop through each sub-array of $inputs to check the behavior of array_unique()
+$iterator = 1;
+foreach($inputs as $input) {
+  echo "-- Iteration $iterator --\n";
+  var_dump( array_unique($input) );
+  $iterator++;
+}
+  
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : Passing different arrays to $input argument ***
+-- Iteration 1 --
+array(2) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(2)
+}
+-- Iteration 2 --
+array(2) {
+  [0]=>
+  float(1.1)
+  [1]=>
+  float(2.2)
+}
+-- Iteration 3 --
+array(2) {
+  [0]=>
+  bool(false)
+  [1]=>
+  bool(true)
+}
+-- Iteration 4 --
+array(0) {
+}
+-- Iteration 5 --
+array(1) {
+  [0]=>
+  NULL
+}
+-- Iteration 6 --
+array(4) {
+  [0]=>
+  string(3) "a"
+  [1]=>
+  string(5) "aaaa
+"
+  [2]=>
+  string(1) "b"
+  [4]=>
+  string(27) "\[\]\!\@\#$\%\^\&\*\(\)\{\}"
+}
+-- Iteration 7 --
+array(4) {
+  [0]=>
+  string(5) "a\v\f"
+  [1]=>
+  string(6) "aaaa\r"
+  [2]=>
+  string(1) "b"
+  [4]=>
+  string(28) "\[\]\!\@\#\$\%\^\&\*\(\)\{\}"
+}
+-- Iteration 8 --
+array(3) {
+  ["h1"]=>
+  string(1) "
+"
+  ["h2"]=>
+  string(88) "hello world
+The quick brown fox jumped over;
+the lazy dog
+This is a double quoted string"
+  ["h3"]=>
+  string(88) "hello
+ world	
+1111		 != 2222
+heredoc
+double quoted string. withdifferentwhitespaces"
+}
+-- Iteration 9 --
+array(2) {
+  [1]=>
+  string(3) "one"
+  [2]=>
+  string(3) "two"
+}
+-- Iteration 10 --
+array(2) {
+  ["one"]=>
+  int(1)
+  ["two"]=>
+  int(2)
+}
+-- Iteration 11 --
+array(3) {
+  [1]=>
+  int(10)
+  [2]=>
+  int(20)
+  [4]=>
+  int(40)
+}
+-- Iteration 12 --
+array(2) {
+  ["one"]=>
+  string(3) "ten"
+  ["two"]=>
+  string(6) "twenty"
+}
+-- Iteration 13 --
+array(3) {
+  ["one"]=>
+  int(1)
+  [2]=>
+  string(3) "two"
+  [4]=>
+  string(4) "four"
+}
+-- Iteration 14 --
+array(2) {
+  [""]=>
+  string(4) "null"
+  ["NULL"]=>
+  NULL
+}
+-- Iteration 15 --
+array(4) {
+  [1]=>
+  string(4) "true"
+  [0]=>
+  string(5) "false"
+  ["false"]=>
+  bool(false)
+  ["true"]=>
+  bool(true)
+}
+-- Iteration 16 --
+array(2) {
+  [""]=>
+  string(6) "emptys"
+  ["emptyd"]=>
+  string(0) ""
+}
+-- Iteration 17 --
+array(2) {
+  [1]=>
+  string(0) ""
+  [6]=>
+  bool(true)
+}
+-- Iteration 18 --
+array(3) {
+  [""]=>
+  int(4)
+  [0]=>
+  int(5)
+  [1]=>
+  int(6)
+}
+Done

ext/standard/tests/array/array_unique_variation3.phpt

@@ -0,0 +1,134 @@
+--TEST--
+Test array_unique() function : usage variations - associative array with different keys
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+ * Testing the functionality of array_unique() by passing different
+ * associative arrays having different keys to $input argument.
+*/
+
+echo "*** Testing array_unique() : assoc. array with diff. keys passed to \$input argument ***\n";
+
+// get an unset variable
+$unset_var = 10;
+unset ($unset_var);
+
+// get a resource variable
+$fp = fopen(__FILE__, "r");
+
+// get a class
+class classA
+{
+  public function __toString(){
+    return "Class A object";
+  }
+}
+
+// get a heredoc string
+$heredoc = <<<EOT
+Hello world
+EOT;
+
+// different associative arrays to be passed to $input argument
+$inputs = array (
+/*1*/  // arrays with integer keys
+       array(0 => "0", 1 => "0"),
+       array(1 => "1", 2 => "2", 3 => 1, 4 => "4"),
+
+       // arrays with float keys
+/*3*/  array(2.3333 => "float", 44.44 => "float"),
+       array(1.2 => "f1", 3.33 => "f2", 4.89999922839999 => "f1", 3333333.333333 => "f4"),
+
+       // arrays with string keys
+/*5*/  array('\tHello' => 111, 're\td' => "color", '\v\fworld' => 2.2, 'pen\n' => 111),
+       array("\tHello" => 111, "re\td" => "color", "\v\fworld" => 2.2, "pen\n" => 111),
+       array("hello", $heredoc => "string", "string"),
+
+       // array with object, unset variable and resource variable
+/*8*/ array(new classA() => 11, @$unset_var => "hello", $fp => 'resource', 11, "hello"),
+);
+
+// loop through each sub-array of $inputs to check the behavior of array_unique()
+$iterator = 1;
+foreach($inputs as $input) {
+  echo "-- Iteration $iterator --\n";
+  var_dump( array_unique($input) );
+  $iterator++;
+}
+
+fclose($fp);
+  
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : assoc. array with diff. keys passed to $input argument ***
+
+Warning: Illegal offset type in %s on line %d
+
+Warning: Illegal offset type in %s on line %d
+-- Iteration 1 --
+array(1) {
+  [0]=>
+  string(1) "0"
+}
+-- Iteration 2 --
+array(3) {
+  [1]=>
+  string(1) "1"
+  [2]=>
+  string(1) "2"
+  [4]=>
+  string(1) "4"
+}
+-- Iteration 3 --
+array(1) {
+  [2]=>
+  string(5) "float"
+}
+-- Iteration 4 --
+array(3) {
+  [1]=>
+  string(2) "f1"
+  [3]=>
+  string(2) "f2"
+  [3333333]=>
+  string(2) "f4"
+}
+-- Iteration 5 --
+array(3) {
+  ["\tHello"]=>
+  int(111)
+  ["re\td"]=>
+  string(5) "color"
+  ["\v\fworld"]=>
+  float(2.2)
+}
+-- Iteration 6 --
+array(3) {
+  ["	Hello"]=>
+  int(111)
+  ["re	d"]=>
+  string(5) "color"
+  ["world"]=>
+  float(2.2)
+}
+-- Iteration 7 --
+array(2) {
+  [0]=>
+  string(5) "hello"
+  ["Hello world"]=>
+  string(6) "string"
+}
+-- Iteration 8 --
+array(2) {
+  [""]=>
+  string(5) "hello"
+  [0]=>
+  int(11)
+}
+Done

ext/standard/tests/array/array_unique_variation4.phpt

@@ -0,0 +1,131 @@
+--TEST--
+Test array_unique() function : usage variations - associative array with different values
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+ * Testing the functionality of array_unique() by passing different
+ * associative arrays having different values to $input argument.
+*/
+
+echo "*** Testing array_unique() : assoc. array with diff. values to \$input argument ***\n";
+
+// get an unset variable
+$unset_var = 10;
+unset ($unset_var);
+
+// get a resource variable
+$fp = fopen(__FILE__, "r");
+
+// get a class
+class classA
+{
+  public function __toString() {
+     return "Class A object";
+  }
+}
+
+// get a heredoc string
+$heredoc = <<<EOT
+Hello world
+EOT;
+
+// associative arrays with different values
+$inputs = array (
+       // arrays with integer values
+/*1*/  array('0' => 0, '1' => 0),
+       array("one" => 1, 'two' => 2, "three" => 1, 4 => 1),
+
+       // arrays with float values
+/*3*/  array("float1" => 2.3333, "float2" => 2.3333),
+       array("f1" => 1.2, 'f2' => 3.33, 3 => 4.89999922839999, 'f4' => 1.2),
+
+       // arrays with string values
+/*5*/  array(111 => "\tHello", "red" => "col\tor", 2 => "\v\fworld", 3.3 =>  "\tHello"),
+       array(111 => '\tHello', "red" => 'col\tor', 2 => '\v\fworld', 3.3 =>  '\tHello'),
+       array(1 => "hello", "heredoc" => $heredoc, $heredoc),
+
+       // array with object, unset variable and resource variable
+/*8*/ array(11 => new classA(), "unset" => @$unset_var, "resource" => $fp, new classA(), $fp),
+);
+
+// loop through each sub-array of $inputs to check the behavior of array_unique()
+$iterator = 1;
+foreach($inputs as $input) {
+  echo "-- Iteration $iterator --\n";
+  var_dump( array_unique($input) );
+  $iterator++;
+}
+
+fclose($fp);
+  
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : assoc. array with diff. values to $input argument ***
+-- Iteration 1 --
+array(1) {
+  [0]=>
+  int(0)
+}
+-- Iteration 2 --
+array(2) {
+  ["one"]=>
+  int(1)
+  ["two"]=>
+  int(2)
+}
+-- Iteration 3 --
+array(1) {
+  ["float1"]=>
+  float(2.3333)
+}
+-- Iteration 4 --
+array(3) {
+  ["f1"]=>
+  float(1.2)
+  ["f2"]=>
+  float(3.33)
+  [3]=>
+  float(4.8999992284)
+}
+-- Iteration 5 --
+array(3) {
+  [111]=>
+  string(6) "	Hello"
+  ["red"]=>
+  string(6) "col	or"
+  [2]=>
+  string(7) "world"
+}
+-- Iteration 6 --
+array(3) {
+  [111]=>
+  string(7) "\tHello"
+  ["red"]=>
+  string(7) "col\tor"
+  [2]=>
+  string(9) "\v\fworld"
+}
+-- Iteration 7 --
+array(2) {
+  [1]=>
+  string(5) "hello"
+  ["heredoc"]=>
+  string(11) "Hello world"
+}
+-- Iteration 8 --
+array(3) {
+  [11]=>
+  object(classA)#%d (0) {
+  }
+  ["unset"]=>
+  NULL
+  ["resource"]=>
+  resource(%d) of type (stream)
+}
+Done

ext/standard/tests/array/array_unique_variation5.phpt

@@ -0,0 +1,33 @@
+--TEST--
+Test array_unique() function : usage variations - array with duplicate keys
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+ * Testing the functionality of array_unique() by passing 
+ * array having duplicate keys as values.
+*/
+
+echo "*** Testing array_unique() : array with duplicate keys for \$input argument ***\n";
+
+// initialize the array having duplicate keys
+$input = array( 1 => "one", 2 => "two", 2 => "2", 3 => "three", 1 => "1", "1", "2");
+var_dump( array_unique($input) );
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : array with duplicate keys for $input argument ***
+array(3) {
+  [1]=>
+  string(1) "1"
+  [2]=>
+  string(1) "2"
+  [3]=>
+  string(5) "three"
+}
+Done

ext/standard/tests/array/array_unique_variation6.phpt

@@ -0,0 +1,44 @@
+--TEST--
+Test array_unique() function : usage variations - array with reference variables
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+ * Testing the functionality of array_unique() by passing 
+ * array having reference variables as values.
+*/
+
+echo "*** Testing array_unique() : array with reference variables for \$input argument ***\n";
+
+$value1 = 10;
+$value2 = "hello";
+$value3 = 0;
+$value4 = &$value2;
+
+// input array containing elements as reference variables
+$input = array(
+  0 => 0,
+  1 => &$value4,
+  2 => &$value2,
+  3 => "hello",
+  4 => &$value3,
+  5 => $value4
+);
+
+var_dump( array_unique($input) );
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : array with reference variables for $input argument ***
+array(2) {
+  [0]=>
+  int(0)
+  [1]=>
+  &string(5) "hello"
+}
+Done

ext/standard/tests/array/array_unique_variation7.phpt

@@ -0,0 +1,33 @@
+--TEST--
+Test array_unique() function : usage variations - binary safe checking
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+ * Testing the functionality of array_unique() by passing an array having binary values.
+*/
+
+echo "*** Testing array_unique() : array with binary data for \$input argument ***\n";
+
+// array with binary values
+$input = array( b"1", b"hello", "world", "str1" => "hello", "str2" => "world");
+
+var_dump( array_unique($input) );
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : array with binary data for $input argument ***
+array(3) {
+  [0]=>
+  string(1) "1"
+  [1]=>
+  string(5) "hello"
+  [2]=>
+  string(5) "world"
+}
+Done

ext/standard/tests/array/array_unique_variation8.phpt

@@ -0,0 +1,44 @@
+--TEST--
+Test array_unique() function : usage variations - two dimensional arrays
+--FILE--
+<?php
+/* Prototype  : array array_unique(array $input)
+ * Description: Removes duplicate values from array 
+ * Source code: ext/standard/array.c
+*/
+
+/*
+ * Testing the functionality of array_unique() by passing 
+ * two dimensional arrays for $input argument.
+*/
+
+echo "*** Testing array_unique() : two dimensional array for \$input argument ***\n";
+
+// initialize the 2-d array
+$input = array( 
+  array(1, 2, 3, 1),
+  array("hello", "world", "str1" => "hello", "str2" => 'world'),
+  array(1 => "one", 2 => "two", "one", 'two'),
+  array(1, 2, 3, 1)
+);
+
+var_dump( array_unique($input) );
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_unique() : two dimensional array for $input argument ***
+array(1) {
+  [0]=>
+  array(4) {
+    [0]=>
+    int(1)
+    [1]=>
+    int(2)
+    [2]=>
+    int(3)
+    [3]=>
+    int(1)
+  }
+}
+Done