array_keys(3) [php man page]

ARRAY_KEYS(3)								 1							     ARRAY_KEYS(3)

array_keys - Return all the keys or a subset of the keys of an array

SYNOPSIS

       array array_keys (array	$array, [mixed	$search_value], [bool  $strict = false])

DESCRIPTION

       array_keys(3) returns the keys, numeric and string, from the $array.

	If  the  optional  $search_value is specified, then only the keys for that value are returned. Otherwise, all the keys from the $array are
       returned.

PARAMETERS

	      o $array
		- An array containing keys to return.

	      o $search_value
		- If specified, then only keys containing these values are returned.

	      o $strict
		- Determines if strict comparison (===) should be used during the search.

RETURN VALUES

	Returns an array of all the keys in $array.

EXAMPLES

       Example #1

	      array_keys(3) example

	      <?php
	      $array = array(0 => 100, "color" => "red");
	      print_r(array_keys($array));

	      $array = array("blue", "red", "green", "blue", "blue");
	      print_r(array_keys($array, "blue"));

	      $array = array("color" => array("blue", "red", "green"),
			     "size"  => array("small", "medium", "large"));
	      print_r(array_keys($array));
	      ?>

	      The above example will output:

	      Array
	      (
		  [0] => 0
		  [1] => color
	      )
	      Array
	      (
		  [0] => 0
		  [1] => 3
		  [2] => 4
	      )
	      Array
	      (
		  [0] => color
		  [1] => size
	      )

SEE ALSO

       array_values(3), array_key_exists(3), array_search(3).

PHP Documentation Group 													     ARRAY_KEYS(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)