array_diff_key(3) [php man page]

ARRAY_DIFF_KEY(3)							 1							 ARRAY_DIFF_KEY(3)

array_diff_key - Computes the difference of arrays using keys for comparison

SYNOPSIS

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

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.

PARAMETERS

	      o $array1
		- The array to compare from

	      o $array2
		- An array to compare against

	      o $...
		- More arrays to compare against

RETURN VALUES

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

EXAMPLES

       Example #1

	      array_diff_key(3) example

	       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.

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

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

	      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_key($array1[0], $array2[0]);.

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_ukey(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_KEY(3)

ARRAY_DIFF_ASSOC(3)							 1						       ARRAY_DIFF_ASSOC(3)

array_diff_assoc - Computes the difference of arrays with additional index check

SYNOPSIS

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

DESCRIPTION

	Compares $array1 against $array2 and returns the difference. Unlike array_diff(3) the array keys are also used in the comparison.

PARAMETERS

	      o $array1
		- The array to compare from

	      o $array2
		- An array to compare against

	      o $...
		- More arrays to compare against

RETURN VALUES

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

EXAMPLES

       Example #1

	      array_diff_assoc(3) example

	       In  this  example  you  see  the  "a" => "green" pair is present in both arrays and thus it is not in the output from the function.
	      Unlike this, the pair 0 => "red" is in the output because in the second argument "red" has key which is 1.

	      <?php
	      $array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
	      $array2 = array("a" => "green", "yellow", "red");
	      $result = array_diff_assoc($array1, $array2);
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [b] => brown
		  [c] => blue
		  [0] => red
	      )

       Example #2

	      array_diff_assoc(3) example

	       Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check
	      takes place so the string representations must be the same.

	      <?php
	      $array1 = array(0, 1, 2);
	      $array2 = array("00", "01", "2");
	      $result = array_diff_assoc($array1, $array2);
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [0] => 0
		  [1] => 1
		  )

NOTES

       Note

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

       Note

	       Ensure you pass arguments in the correct order when comparing similar arrays with more keys. The new array should be the  first	in
	      the list.

SEE ALSO

       array_diff(3), array_diff_uassoc(3), array_udiff_assoc(3), array_udiff_uassoc(3), array_intersect(3), array_intersect_assoc(3).

PHP Documentation Group 												       ARRAY_DIFF_ASSOC(3)