array_unique(3) [php man page]

ARRAY_UNIQUE(3) 							 1							   ARRAY_UNIQUE(3)

array_unique - Removes duplicate values from an array

SYNOPSIS

       array array_unique (array  $array, [int	$sort_flags = SORT_STRING])

DESCRIPTION

	Takes an input $array and returns a new array without duplicate values.

	Note  that  keys  are preserved. array_unique(3) sorts the values treated as string at first, then will keep the first key encountered for
       every value, and ignore all following keys. It does not mean that the key of the first related value from the unsorted $array will be kept.

       Note

	       Two elements are considered equal if and only if (string) $elem1 === (string) $elem2 i.e. when the  string  representation  is  the
	      same, the first element will be used.

PARAMETERS

	      o $array
		- The input array.

	      o $sort_flags
		- The optional second parameter $sort_flags may be used to modify the sorting behavior using these values:  Sorting type flags:

		     o SORT_REGULAR - compare items normally (don't change types)

		     o SORT_NUMERIC - compare items numerically

		     o SORT_STRING - compare items as strings

		     o SORT_LOCALE_STRING - compare items as strings, based on the current locale.

RETURN VALUES

	Returns the filtered array.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       |5.2.10	|						    |
       |	|						    |
       |	|  Changed the default value of $sort_flags back to |
       |	| SORT_STRING.					    |
       |	|						    |
       | 5.2.9	|						    |
       |	|						    |
       |	|  Added the  optional	$sort_flags  defaulting  to |
       |	| SORT_REGULAR.  Prior to 5.2.9, this function used |
       |	| to sort the array with SORT_STRING internally.    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      array_unique(3) example

	      <?php
	      $input = array("a" => "green", "red", "b" => "green", "blue", "red");
	      $result = array_unique($input);
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [a] => green
		  [0] => red
		  [1] => blue
	      )

       Example #2

	      array_unique(3) and types

	      <?php
	      $input = array(4, "4", "3", 4, 3, "3");
	      $result = array_unique($input);
	      var_dump($result);
	      ?>

	      The above example will output:

	      array(2) {
		[0] => int(4)
		[2] => string(1) "3"
	      }

SEE ALSO

       array_count_values(3).

NOTES

       Note

	       Note that array_unique(3) is not intended to work on multi dimensional arrays.

PHP Documentation Group 													   ARRAY_UNIQUE(3)

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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)

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