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)

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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)

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array_intersect_key(3) [php man page]

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