array_intersect_key(3) [php man page]

ARRAY_INTERSECT_KEY(3)							 1						    ARRAY_INTERSECT_KEY(3)

array_intersect_key - Computes the intersection of arrays using keys for comparison

SYNOPSIS

       array array_intersect_key (array  $array1, array  $array2, [array  $...])

DESCRIPTION

       array_intersect_key(3) returns an array containing all the entries of $array1 which have keys that are present in all the arguments.

PARAMETERS

	      o $array1
		- The array with master keys to check.

	      o $array2
		- An array to compare keys against.

	      o $...
		- A variable list of arrays to compare.

RETURN VALUES

	Returns an associative array containing all the entries of $array1 which have keys that are present in all arguments.

EXAMPLES

       Example #1

	      array_intersect_key(3) example

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

	      var_dump(array_intersect_key($array1, $array2));
	      ?>

	      The above example will output:

	      array(2) {
		["blue"]=>
		int(1)
		["green"]=>
		int(3)
	      }

	In our example you see that only the keys 'blue' and 'green' are present in both arrays and thus returned. Also notice that the values for
       the keys 'blue' and 'green' differ between the two arrays. A match still occurs because only the keys are checked. The values returned  are
       those of $array1.

	The  two  keys	from  the key => value pairs are considered equal only if (string) $key1 === (string) $key2 . In other words a strict type
       check is executed so the string representation must be the same.

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_diff_ukey(3), array_intersect(3), array_intersect_assoc(3), array_intersect_uassoc(3), array_intersect_ukey(3).

PHP Documentation Group 												    ARRAY_INTERSECT_KEY(3)

ARRAY_UDIFF_ASSOC(3)							 1						      ARRAY_UDIFF_ASSOC(3)

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

SYNOPSIS

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

DESCRIPTION

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

       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_assoc($array1[0], $array2[0], "some_comparison_func");.

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)

RETURN VALUES

       array_udiff_assoc(3)  returns an array containing all the values from $array1 that are not present in any of the other arguments. Note that
       the keys are used in the comparison unlike array_diff(3) and array_udiff(3). The comparison of arrays' data is performed by using an  user-
       supplied  callback.  In this aspect the behaviour is opposite to the behaviour of array_diff_assoc(3) which uses internal function for com-
       parison.

EXAMPLES

       Example #1

	      array_udiff_assoc(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;
		  }
	      }

	      $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),);

	      $result = array_udiff_assoc($a, $b, array("cr", "comp_func_cr"));
	      print_r($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.

SEE ALSO

       array_diff(3),  array_diff_assoc(3),  array_diff_uassoc(3),   array_udiff(3),   array_udiff_uassoc(3),	array_intersect(3),   array_inter-
       sect_assoc(3), array_uintersect(3), array_uintersect_assoc(3), array_uintersect_uassoc(3).

PHP Documentation Group 												      ARRAY_UDIFF_ASSOC(3)