--TEST--
Test asort() function : usage variations - sort array with diff. sub arrays, 'sort_flags' as default/SORT_REGULAR 
--FILE--
<?php
/* Prototype  : bool asort ( array &$array [, int $sort_flags] )
 * Description: Sort an array and maintain index association. 
                Elements will be arranged from lowest to highest when this function has completed.
 * Source code: ext/standard/array.c
*/

/*
 * testing asort() by providing arrays contains sub arrays for $array argument with flowing flag values
 * flag value as default
 * SORT_REGULAR - compare items normally
 * Note: arrays are sorted based on total count of elements inside it, when all the elements are arrays
*/

echo "*** Testing asort() : usage variations ***\n";

// array of arrays
$various_arrays = array (
  // null array
  "array[0]" => array(),

  // array contains null sub array
  "array[1]" => array( "sub_array[1][0]" => array() ),

  // array of arrays along with some values
  "array[2]" => array("data[2,0]" => 44, "data[2,1]" => 11, "sub_array[2][0] " => array(64,61) ),

  // array contains sub arrays
  "array[3]" => array ( "sub_array[3][0]" => array(33,-5,6), "sub_array[3][1]" => array(11), 
                        "sub_array[3][2]" => array(22,-55), "sub_array[3][3]" => array() )
);


$count = 1;
echo "\n-- Testing asort() by supplying various arrays containing sub arrays --\n";

// loop through to test asort() with different arrays
foreach ($various_arrays as $array) {
 
  echo "\n-- Iteration $count --\n"; 
  // testing asort() function by supplying different arrays, flag value is default
  echo "- With default sort_flag -\n";
  $temp_array = $array;
  var_dump(asort($temp_array) );
  var_dump($temp_array);

  // testing asort() function by supplying different arrays, flag value = SORT_REGULAR
  echo "- Sort_flag = SORT_REGULAR -\n";
  $temp_array = $array;
  var_dump(asort($temp_array, SORT_REGULAR) );
  var_dump($temp_array);
  $count++;
}

echo "Done\n";
?>
--EXPECTF--
*** Testing asort() : usage variations ***

-- Testing asort() by supplying various arrays containing sub arrays --

-- Iteration 1 --
- With default sort_flag -
bool(true)
array(0) {
}
- Sort_flag = SORT_REGULAR -
bool(true)
array(0) {
}

-- Iteration 2 --
- With default sort_flag -
bool(true)
array(1) {
  ["sub_array[1][0]"]=>
  array(0) {
  }
}
- Sort_flag = SORT_REGULAR -
bool(true)
array(1) {
  ["sub_array[1][0]"]=>
  array(0) {
  }
}

-- Iteration 3 --
- With default sort_flag -
bool(true)
array(3) {
  ["data[2,1]"]=>
  int(11)
  ["data[2,0]"]=>
  int(44)
  ["sub_array[2][0] "]=>
  array(2) {
    [0]=>
    int(64)
    [1]=>
    int(61)
  }
}
- Sort_flag = SORT_REGULAR -
bool(true)
array(3) {
  ["data[2,1]"]=>
  int(11)
  ["data[2,0]"]=>
  int(44)
  ["sub_array[2][0] "]=>
  array(2) {
    [0]=>
    int(64)
    [1]=>
    int(61)
  }
}

-- Iteration 4 --
- With default sort_flag -
bool(true)
array(4) {
  ["sub_array[3][3]"]=>
  array(0) {
  }
  ["sub_array[3][1]"]=>
  array(1) {
    [0]=>
    int(11)
  }
  ["sub_array[3][2]"]=>
  array(2) {
    [0]=>
    int(22)
    [1]=>
    int(-55)
  }
  ["sub_array[3][0]"]=>
  array(3) {
    [0]=>
    int(33)
    [1]=>
    int(-5)
    [2]=>
    int(6)
  }
}
- Sort_flag = SORT_REGULAR -
bool(true)
array(4) {
  ["sub_array[3][3]"]=>
  array(0) {
  }
  ["sub_array[3][1]"]=>
  array(1) {
    [0]=>
    int(11)
  }
  ["sub_array[3][2]"]=>
  array(2) {
    [0]=>
    int(22)
    [1]=>
    int(-55)
  }
  ["sub_array[3][0]"]=>
  array(3) {
    [0]=>
    int(33)
    [1]=>
    int(-5)
    [2]=>
    int(6)
  }
}
Done