array_diff_ukey(3) [php man page]

ARRAY_DIFF_UKEY(3)							 1							ARRAY_DIFF_UKEY(3)

array_diff_ukey - Computes the difference of arrays using a callback function on the keys for comparison

SYNOPSIS

       array array_diff_ukey (array  $array1, array  $array2, [array  $...], callable  $key_compare_func)

DESCRIPTION

	Compares  the  keys  from $array1 against the keys from $array2 and returns the difference. This function is like array_diff(3) except the
       comparison is done on the keys instead of the values.

	Unlike array_diff_key(3) a user supplied callback function is used for the indices comparison, not internal function.

PARAMETERS

	      o $array1
		- The array to compare from

	      o $array2
		- An array to compare against

	      o $...
		- More arrays to compare against

	      o $key_compare_func
		- The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered	to
		be respectively less than, equal to, or greater than the second.
		int callback (mixed  $a, mixed	$b)

RETURN VALUES

	Returns an array containing all the entries from $array1 that are not present in any of the other arrays.

EXAMPLES

       Example #1

	      array_diff_ukey(3) example

	      <?php
	      function key_compare_func($key1, $key2)
	      {
		  if ($key1 == $key2)
		      return 0;
		  else if ($key1 > $key2)
		      return 1;
		  else
		      return -1;
	      }

	      $array1 = array('blue'  => 1, 'red'  => 2, 'green'  => 3, 'purple' => 4);
	      $array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan'	 => 8);

	      var_dump(array_diff_ukey($array1, $array2, 'key_compare_func'));
	      ?>

	      The above example will output:

	      array(2) {
		["red"]=>
		int(2)
		["purple"]=>
		int(4)
	      }

NOTES

       Note

	       This  function  only  checks  one  dimension  of  a  n-dimensional  array.  Of  course  you  can  check	deeper dimensions by using
	      array_diff_ukey($array1[0], $array2[0], 'callback_func');.

SEE ALSO

       array_diff(3), array_udiff(3), array_diff_assoc(3), array_diff_uassoc(3), array_udiff_assoc(3),	array_udiff_uassoc(3),	array_diff_key(3),
       array_intersect(3), array_intersect_assoc(3), array_intersect_uassoc(3), array_intersect_key(3), array_intersect_ukey(3).

PHP Documentation Group 													ARRAY_DIFF_UKEY(3)

ARRAY_UDIFF_UASSOC(3)							 1						     ARRAY_UDIFF_UASSOC(3)

array_udiff_uassoc - Computes the difference of arrays with additional index check, compares data and indexes by a callback function

SYNOPSIS

       array array_udiff_uassoc (array	$array1, array	$array2, [array  $...], callable  $value_compare_func, callable  $key_compare_func)

DESCRIPTION

	Computes the difference of arrays with additional index check, compares data and indexes by a callback function.

	Note that the keys are used in the comparison unlike array_diff(3) and array_udiff(3).

PARAMETERS

	      o $array1
		- The first array.

	      o $array2
		- The second array.

	      o $value_compare_func
		-  The comparison function must return an integer less than, equal to, or greater than zero if the first argument is considered to
		be respectively less than, equal to, or greater than the second.
		int callback (mixed  $a, mixed	$b)

	      o $key_compare_func
		- The comparison of keys (indices) is done also by  the  callback  function  $key_compare_func.  This  behaviour  is  unlike  what
		array_udiff_assoc(3) does, since the latter compares the indices by using an internal function.

RETURN VALUES

	Returns an array containing all the values from $array1 that are not present in any of the other arguments.

EXAMPLES

       Example #1

	      array_udiff_uassoc(3) example

	      <?php
	      class cr {
		  private $priv_member;
		  function cr($val)
		  {
		      $this->priv_member = $val;
		  }

		  static function comp_func_cr($a, $b)
		  {
		      if ($a->priv_member === $b->priv_member) return 0;
		      return ($a->priv_member > $b->priv_member)? 1:-1;
		  }

		  static function comp_func_key($a, $b)
		  {
		      if ($a === $b) return 0;
		      return ($a > $b)? 1:-1;
		  }
	      }
	      $a = array("0.1" => new cr(9), "0.5" => new cr(12), 0 => new cr(23), 1=> new cr(4), 2 => new cr(-15),);
	      $b = array("0.2" => new cr(9), "0.5" => new cr(22), 0 => new cr(3), 1=> new cr(4), 2 => new cr(-15),);

	      $result = array_udiff_uassoc($a, $b, array("cr", "comp_func_cr"), array("cr", "comp_func_key"));
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [0.1] => cr Object
		      (
			  [priv_member:private] => 9
		      )

		  [0.5] => cr Object
		      (
			  [priv_member:private] => 12
		      )

		  [0] => cr Object
		      (
			  [priv_member:private] => 23
		      )
	      )

	In  our example above you see the "1" => new cr(4) pair is present in both arrays and thus it is not in the output from the function. Keep
       in mind that you have to supply 2 callback functions.

NOTES

       Note

	       Please note that this function only checks one dimension of a n-dimensional array. Of course you can  check  deeper  dimensions	by
	      using, for example, array_udiff_uassoc($array1[0], $array2[0], "data_compare_func", "key_compare_func");.

SEE ALSO

       array_diff(3),  array_diff_assoc(3),  array_udiff(3),  array_udiff_assoc(3),  array_intersect(3),  array_intersect_assoc(3),  array_uinter-
       sect(3), array_uintersect_assoc(3), array_uintersect_uassoc(3).

PHP Documentation Group 												     ARRAY_UDIFF_UASSOC(3)