- New tests for array_shift() function

ext/standard/tests/array/array_shift_basic.phpt

@@ -0,0 +1,54 @@
+--TEST--
+Test array_shift() function : basic functionality 
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Test basic functionality of array_shift()
+ */
+
+echo "*** Testing array_shift() : basic functionality ***\n";
+
+$array = array('zero', 'one', '3' => 'three', 'four' => 4);
+echo "\n-- Before shift: --\n";
+var_dump($array);
+
+echo "\n-- After shift: --\n";
+echo "Returned value:\t";
+var_dump(array_shift($array));
+echo "New array:\n";
+var_dump($array);
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : basic functionality ***
+
+-- Before shift: --
+array(4) {
+  [0]=>
+  string(4) "zero"
+  [1]=>
+  string(3) "one"
+  [3]=>
+  string(5) "three"
+  ["four"]=>
+  int(4)
+}
+
+-- After shift: --
+Returned value:	string(4) "zero"
+New array:
+array(3) {
+  [0]=>
+  string(3) "one"
+  [1]=>
+  string(5) "three"
+  ["four"]=>
+  int(4)
+}
+Done

ext/standard/tests/array/array_shift_error.phpt

@@ -0,0 +1,40 @@
+--TEST--
+Test array_shift() function : error conditions - Pass incorrect number of args
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c 
+ */
+
+/*
+ * Pass incorrect number of arguments to array_shift() to test behaviour
+ */
+
+echo "*** Testing array_shift() : error conditions ***\n";
+
+// Zero arguments
+echo "\n-- Testing array_shift() function with Zero arguments --\n";
+var_dump( array_shift() );
+
+//Test array_shift with one more than the expected number of arguments
+echo "\n-- Testing array_shift() function with more than expected no. of arguments --\n";
+$stack = array(1, 2);
+$extra_arg = 10;
+var_dump( array_shift($stack, $extra_arg) );
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : error conditions ***
+
+-- Testing array_shift() function with Zero arguments --
+
+Warning: array_shift() expects exactly 1 parameter, 0 given in %s on line %d
+NULL
+
+-- Testing array_shift() function with more than expected no. of arguments --
+
+Warning: array_shift() expects exactly 1 parameter, 2 given in %s on line %d
+NULL
+Done

ext/standard/tests/array/array_shift_variation1.phpt

@@ -0,0 +1,218 @@
+--TEST--
+Test array_shift() function : usage variations - Pass different data types as $stack arg
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Pass different data types as $stack argument to array_shift() to test behaviour
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+//get an unset variable
+$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 $stack argument
+$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 $inputs to check the behavior of array_shift()
+$iterator = 1;
+foreach($inputs as $input) {
+  echo "\n-- Iteration $iterator --\n";
+  var_dump( array_shift($input) );
+  $iterator++;
+};
+
+fclose($fp);
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Iteration 1 --
+
+Warning: array_shift() expects parameter 1 to be array, integer given in %s on line %d
+NULL
+
+-- Iteration 2 --
+
+Warning: array_shift() expects parameter 1 to be array, integer given in %s on line %d
+NULL
+
+-- Iteration 3 --
+
+Warning: array_shift() expects parameter 1 to be array, integer given in %s on line %d
+NULL
+
+-- Iteration 4 --
+
+Warning: array_shift() expects parameter 1 to be array, integer given in %s on line %d
+NULL
+
+-- Iteration 5 --
+
+Warning: array_shift() expects parameter 1 to be array, double given in %s on line %d
+NULL
+
+-- Iteration 6 --
+
+Warning: array_shift() expects parameter 1 to be array, double given in %s on line %d
+NULL
+
+-- Iteration 7 --
+
+Warning: array_shift() expects parameter 1 to be array, double given in %s on line %d
+NULL
+
+-- Iteration 8 --
+
+Warning: array_shift() expects parameter 1 to be array, double given in %s on line %d
+NULL
+
+-- Iteration 9 --
+
+Warning: array_shift() expects parameter 1 to be array, double given in %s on line %d
+NULL
+
+-- Iteration 10 --
+
+Warning: array_shift() expects parameter 1 to be array, null given in %s on line %d
+NULL
+
+-- Iteration 11 --
+
+Warning: array_shift() expects parameter 1 to be array, null given in %s on line %d
+NULL
+
+-- Iteration 12 --
+
+Warning: array_shift() expects parameter 1 to be array, boolean given in %s on line %d
+NULL
+
+-- Iteration 13 --
+
+Warning: array_shift() expects parameter 1 to be array, boolean given in %s on line %d
+NULL
+
+-- Iteration 14 --
+
+Warning: array_shift() expects parameter 1 to be array, boolean given in %s on line %d
+NULL
+
+-- Iteration 15 --
+
+Warning: array_shift() expects parameter 1 to be array, boolean given in %s on line %d
+NULL
+
+-- Iteration 16 --
+
+Warning: array_shift() expects parameter 1 to be array, string given in %s on line %d
+NULL
+
+-- Iteration 17 --
+
+Warning: array_shift() expects parameter 1 to be array, string given in %s on line %d
+NULL
+
+-- Iteration 18 --
+
+Warning: array_shift() expects parameter 1 to be array, string given in %s on line %d
+NULL
+
+-- Iteration 19 --
+
+Warning: array_shift() expects parameter 1 to be array, string given in %s on line %d
+NULL
+
+-- Iteration 20 --
+
+Warning: array_shift() expects parameter 1 to be array, string given in %s on line %d
+NULL
+
+-- Iteration 21 --
+
+Warning: array_shift() expects parameter 1 to be array, object given in %s on line %d
+NULL
+
+-- Iteration 22 --
+
+Warning: array_shift() expects parameter 1 to be array, null given in %s on line %d
+NULL
+
+-- Iteration 23 --
+
+Warning: array_shift() expects parameter 1 to be array, null given in %s on line %d
+NULL
+
+-- Iteration 24 --
+
+Warning: array_shift() expects parameter 1 to be array, resource given in %s on line 85
+NULL
+Done

ext/standard/tests/array/array_shift_variation2.phpt

@@ -0,0 +1,208 @@
+--TEST--
+Test array_shift() function : usage variations - Pass arrays of different data types
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Pass arrays where values are of one data type to test behaviour of array_shift()
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+
+//get an unset variable
+$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");
+
+// arrays of different data types to be passed to $stack argument
+$inputs = array(
+
+       // int data
+/*1*/  'int' => array(
+	   0,
+       1,
+       12345,
+       -2345,
+       ),
+
+       // float data
+/*2*/  'float' => array(
+       10.5,
+       -10.5,
+       12.3456789000e10,
+       12.3456789000E-10,
+       .5,
+       ),
+
+       // null data
+/*3*/ 'null' => array(
+       NULL,
+       null,
+       ),
+
+       // boolean data
+/*4*/ 'bool' => array(
+       true,
+       false,
+       TRUE,
+       FALSE,
+       ),
+       
+       // empty data
+/*5*/ 'empty string' => array(
+       "",
+       '',
+       ),
+       
+/*6*/ 'empty array' => array(
+       ),
+
+       // string data
+/*7*/ 'string' => array(
+       "string",
+       'string',
+       $heredoc,
+       ),
+       
+       // object data
+/*8*/ 'object' => array(
+       new classA(),
+       ),
+
+       // undefined data
+/*9*/ 'undefined' => array(
+       @$undefined_var,
+       ),
+
+       // unset data
+/*10*/ 'unset' => array(
+       @$unset_var,
+       ),
+
+       // resource variable
+/*11*/ 'resource' => array(
+       $fp
+       ),
+);
+
+// loop through each element of $inputs to check the behavior of array_shift
+$iterator = 1;
+foreach($inputs as $key => $input) {
+  echo "\n-- Iteration $iterator: $key data --\n";
+  var_dump( array_shift($input) );
+  var_dump($input);
+  $iterator++;
+};
+
+fclose($fp);
+
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Iteration 1: int data --
+int(0)
+array(3) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(12345)
+  [2]=>
+  int(-2345)
+}
+
+-- Iteration 2: float data --
+float(10.5)
+array(4) {
+  [0]=>
+  float(-10.5)
+  [1]=>
+  float(123456789000)
+  [2]=>
+  float(1.23456789E-9)
+  [3]=>
+  float(0.5)
+}
+
+-- Iteration 3: null data --
+NULL
+array(1) {
+  [0]=>
+  NULL
+}
+
+-- Iteration 4: bool data --
+bool(true)
+array(3) {
+  [0]=>
+  bool(false)
+  [1]=>
+  bool(true)
+  [2]=>
+  bool(false)
+}
+
+-- Iteration 5: empty string data --
+string(0) ""
+array(1) {
+  [0]=>
+  string(0) ""
+}
+
+-- Iteration 6: empty array data --
+NULL
+array(0) {
+}
+
+-- Iteration 7: string data --
+string(6) "string"
+array(2) {
+  [0]=>
+  string(6) "string"
+  [1]=>
+  string(11) "hello world"
+}
+
+-- Iteration 8: object data --
+object(classA)#%d (0) {
+}
+array(0) {
+}
+
+-- Iteration 9: undefined data --
+NULL
+array(0) {
+}
+
+-- Iteration 10: unset data --
+NULL
+array(0) {
+}
+
+-- Iteration 11: resource data --
+resource(%d) of type (stream)
+array(0) {
+}
+Done

ext/standard/tests/array/array_shift_variation3.phpt

@@ -0,0 +1,188 @@
+--TEST--
+Test array_shift() function : usage variations - Pass array with different data types as keys
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Pass arrays with different data types as keys to test how array_shift() re-assigns keys
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+//get an unset variable
+$unset_var = 10;
+unset ($unset_var);
+
+// heredoc string
+$heredoc = <<<EOT
+hello world
+EOT;
+
+// unexpected values 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',
+       ),
+       
+/*3*/  'extreme floats' => array(
+       12.3456789000e10 => 'large',
+       12.3456789000E-10 => 'small',
+       ),
+
+       // null data
+/*4*/  'null uppercase' => array(
+       NULL => 'null 1',
+       ), 
+       
+/*5*/  'null lowercase' => array(
+       null => 'null 2',
+       ),
+
+       // boolean data
+/*6*/  'bool lowercase' => array(
+       true => 'lowert',
+       false => 'lowerf',
+       ),
+       
+/*7*/  'bool uppercase' => array(
+       TRUE => 'uppert',
+       FALSE => 'upperf',
+       ),
+       
+       // empty data
+/*8*/  'empty double quotes' => array(
+       "" => 'emptyd',
+       ),
+       
+/*9*/  'empty single quotes' => array(
+       '' => 'emptys',
+       ),
+
+       // string data
+/*10*/ 'string' => array(
+       "stringd" => 'stringd',
+       'strings' => 'strings',
+       $heredoc => 'stringh',
+       ),
+
+       // undefined data
+/*11*/ 'undefined' => array(
+       @$undefined_var => 'undefined',
+       ),
+
+       // unset data
+/*12*/ 'unset' => array(
+       @$unset_var => 'unset',
+       ),
+);
+
+// loop through each element of $inputs to check the behavior of array_shift()
+$iterator = 1;
+foreach($inputs as $key => $input) {
+  echo "\n-- Iteration $iterator : $key data --\n";
+  var_dump( array_shift($input) );
+  var_dump($input);
+  $iterator++;
+};
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Iteration 1 : int data --
+string(4) "zero"
+array(3) {
+  [0]=>
+  string(3) "one"
+  [1]=>
+  string(8) "positive"
+  [2]=>
+  string(8) "negative"
+}
+
+-- Iteration 2 : float data --
+string(8) "positive"
+array(2) {
+  [0]=>
+  string(8) "negative"
+  [1]=>
+  string(4) "half"
+}
+
+-- Iteration 3 : extreme floats data --
+string(5) "large"
+array(1) {
+  [0]=>
+  string(5) "small"
+}
+
+-- Iteration 4 : null uppercase data --
+string(6) "null 1"
+array(0) {
+}
+
+-- Iteration 5 : null lowercase data --
+string(6) "null 2"
+array(0) {
+}
+
+-- Iteration 6 : bool lowercase data --
+string(6) "lowert"
+array(1) {
+  [0]=>
+  string(6) "lowerf"
+}
+
+-- Iteration 7 : bool uppercase data --
+string(6) "uppert"
+array(1) {
+  [0]=>
+  string(6) "upperf"
+}
+
+-- Iteration 8 : empty double quotes data --
+string(6) "emptyd"
+array(0) {
+}
+
+-- Iteration 9 : empty single quotes data --
+string(6) "emptys"
+array(0) {
+}
+
+-- Iteration 10 : string data --
+string(7) "stringd"
+array(2) {
+  ["strings"]=>
+  string(7) "strings"
+  ["hello world"]=>
+  string(7) "stringh"
+}
+
+-- Iteration 11 : undefined data --
+string(9) "undefined"
+array(0) {
+}
+
+-- Iteration 12 : unset data --
+string(5) "unset"
+array(0) {
+}
+Done

ext/standard/tests/array/array_shift_variation4.phpt

@@ -0,0 +1,109 @@
+--TEST--
+Test array_shift() function : usage variations - multi-dimensional arrays
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Test popping elements from a sub-array and popping an array from an array
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+$stack_first = array(array(1, 2, 3), 'one', 'two');
+$stack_last = array ('zero', 'one', array (1, 2, 3));
+echo "\n-- Before shift: --\n";
+echo "---- \$stack_first:\n";
+var_dump($stack_first);
+echo "---- \$stack_last:\n";
+var_dump($stack_last);
+
+echo "\n-- After shift: --\n";
+echo "---- Pop array from array:\n";
+echo "Returned value:\t";
+var_dump(array_shift($stack_first));
+echo "New array:\n";
+var_dump($stack_first);
+
+echo "---- Pop element from array within array:\n";
+echo "Returned value:\t";
+var_dump(array_shift($stack_last[2]));
+echo "New array:\n";
+var_dump($stack_last);
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Before shift: --
+---- $stack_first:
+array(3) {
+  [0]=>
+  array(3) {
+    [0]=>
+    int(1)
+    [1]=>
+    int(2)
+    [2]=>
+    int(3)
+  }
+  [1]=>
+  string(3) "one"
+  [2]=>
+  string(3) "two"
+}
+---- $stack_last:
+array(3) {
+  [0]=>
+  string(4) "zero"
+  [1]=>
+  string(3) "one"
+  [2]=>
+  array(3) {
+    [0]=>
+    int(1)
+    [1]=>
+    int(2)
+    [2]=>
+    int(3)
+  }
+}
+
+-- After shift: --
+---- Pop array from array:
+Returned value:	array(3) {
+  [0]=>
+  int(1)
+  [1]=>
+  int(2)
+  [2]=>
+  int(3)
+}
+New array:
+array(2) {
+  [0]=>
+  string(3) "one"
+  [1]=>
+  string(3) "two"
+}
+---- Pop element from array within array:
+Returned value:	int(1)
+New array:
+array(3) {
+  [0]=>
+  string(4) "zero"
+  [1]=>
+  string(3) "one"
+  [2]=>
+  array(2) {
+    [0]=>
+    int(2)
+    [1]=>
+    int(3)
+  }
+}
+Done

ext/standard/tests/array/array_shift_variation5.phpt

@@ -0,0 +1,45 @@
+--TEST--
+Test array_shift() function : usage variations - call recursively
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Use the result of one call to array_shift 
+ * as the the $stack argument of another call to array_shift()
+ * When done in one statement causes strict error messages. 
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+$stack = array ( array ( array ('zero', 'one', 'two'), 'un', 'deux'), 'eins', 'zwei');
+
+// not following strict standards
+echo "\n-- Incorrect Method: --\n";
+var_dump(array_shift(array_shift(array_shift($stack))));
+
+$stack = array (array( array('zero', 'one', 'two'), 'un', 'deux'), 'eins', 'zwei');
+// correct way of doing above:
+echo "\n-- Correct Method: --\n";
+$result1 = array_shift($stack);
+$result2 = array_shift($result1);
+var_dump(array_shift($result2));
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Incorrect Method: --
+
+Strict Standards: Only variables should be passed by reference in %s on line %d
+
+Strict Standards: Only variables should be passed by reference in %s on line %d
+string(4) "zero"
+
+-- Correct Method: --
+string(4) "zero"
+Done

ext/standard/tests/array/array_shift_variation6.phpt

@@ -0,0 +1,83 @@
+--TEST--
+Test array_shift() function : usage variations - Referenced arrays
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Test how array_shift when passed:
+ * 1. a variable that is referenced to an array
+ * 2. an array that contains a referenced array
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+echo "\n-- Variable is referenced array --\n";
+$original_array = array('zero', 'one', 'two');
+$copied_array = &$original_array;
+
+echo "Result: ";
+var_dump(array_shift($copied_array));
+echo "\n\$original_array:\n";
+var_dump($original_array);
+echo "\n\$copied_array:\n";
+var_dump($copied_array);
+
+echo "\n-- Element is referenced array --\n";
+$new_array = array (&$copied_array, 1, 'two');
+echo "Result: ";
+var_dump(array_shift($new_array[0]));
+echo "\n\$new_array:\n";
+var_dump($new_array);
+echo "\n\$copied_array\n";
+var_dump($copied_array);
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Variable is referenced array --
+Result: string(4) "zero"
+
+$original_array:
+array(2) {
+  [0]=>
+  string(3) "one"
+  [1]=>
+  string(3) "two"
+}
+
+$copied_array:
+array(2) {
+  [0]=>
+  string(3) "one"
+  [1]=>
+  string(3) "two"
+}
+
+-- Element is referenced array --
+Result: string(3) "one"
+
+$new_array:
+array(3) {
+  [0]=>
+  &array(1) {
+    [0]=>
+    string(3) "two"
+  }
+  [1]=>
+  int(1)
+  [2]=>
+  string(3) "two"
+}
+
+$copied_array
+array(1) {
+  [0]=>
+  string(3) "two"
+}
+Done

ext/standard/tests/array/array_shift_variation7.phpt

@@ -0,0 +1,34 @@
+--TEST--
+Test array_shift() function : usage variations - position of internal pointer
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * Test that the internal pointer is reset after calling array_shift()
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+$stack = array ('one' => 'un', 'two' => 'deux');
+
+echo "\n-- Call array_shift() --\n";
+var_dump($result = array_shift($stack));
+
+echo "\n-- Position of Internal Pointer in Passed Array: --\n";
+echo key($stack) . " => " . current ($stack) . "\n";
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Call array_shift() --
+string(2) "un"
+
+-- Position of Internal Pointer in Passed Array: --
+two => deux
+Done

ext/standard/tests/array/array_shift_variation8.phpt

@@ -0,0 +1,50 @@
+--TEST--
+Test array_shift() function : usage variations - maintaining referenced elements
+--FILE--
+<?php
+/* Prototype  : mixed array_shift(array &$stack)
+ * Description: Pops an element off the beginning of the array 
+ * Source code: ext/standard/array.c
+ */
+
+/*
+ * From a comment left by Traps on 09-Jul-2007 on the array_shift documentation page:
+ * For those that may be trying to use array_shift() with an array containing references 
+ * (e.g. working with linked node trees), beware that array_shift() may not work as you expect: 
+ * it will return a *copy* of the first element of the array, 
+ * and not the element itself, so your reference will be lost.
+ * The solution is to reference the first element before removing it with array_shift():
+ */
+
+echo "*** Testing array_shift() : usage variations ***\n";
+
+// using only array_shift:
+echo "\n-- Reference result of array_shift: --\n";
+$a = 1;
+$array = array(&$a);
+$b =& array_shift($array);
+$b = 2;
+echo "a = $a, b = $b\n";
+
+// solution: referencing the first element first:
+echo "\n-- Reference first element before array_shift: --\n";
+$a = 1;
+$array = array(&$a);
+$b =& $array[0];
+array_shift($array);
+$b = 2;
+echo "a = $a, b = $b\n";
+
+echo "Done";
+?>
+--EXPECTF--
+*** Testing array_shift() : usage variations ***
+
+-- Reference result of array_shift: --
+
+Strict Standards: Only variables should be assigned by reference in %s on line %d
+a = 1, b = 2
+
+-- Reference first element before array_shift: --
+a = 2, b = 2
+Done