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)

ARRAY_MERGE(3)								 1							    ARRAY_MERGE(3)

array_merge - Merge one or more arrays

SYNOPSIS

       array array_merge (array  $array1, [array  $...])

DESCRIPTION

	Merges	the  elements of one or more arrays together so that the values of one are appended to the end of the previous one. It returns the
       resulting array.

	If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the  arrays
       contain numeric keys, the later value will not overwrite the original value, but will be appended.

	Values in the input array with numeric keys will be renumbered with incrementing keys starting from zero in the result array.

PARAMETERS

	      o $array1
		- Initial array to merge.

	      o $...
		- Variable list of arrays to merge.

RETURN VALUES

	Returns the resulting array.

EXAMPLES

       Example #1

	      array_merge(3) example

	      <?php
	      $array1 = array("color" => "red", 2, 4);
	      $array2 = array("a", "b", "color" => "green", "shape" => "trapezoid", 4);
	      $result = array_merge($array1, $array2);
	      print_r($result);
	      ?>

	      The above example will output:

	      Array
	      (
		  [color] => green
		  [0] => 2
		  [1] => 4
		  [2] => a
		  [3] => b
		  [shape] => trapezoid
		  [4] => 4
	      )

       Example #2

	      Simple array_merge(3) example

	      <?php
	      $array1 = array();
	      $array2 = array(1 => "data");
	      $result = array_merge($array1, $array2);
	      ?>

	       Don't forget that numeric keys will be renumbered!

	      Array
	      (
		  [0] => data
	      )

	       If  you	want  to  append array elements from the second array to the first array while not overwriting the elements from the first
	      array and not re-indexing, use the + array union operator:

	      <?php
	      $array1 = array(0 => 'zero_a', 2 => 'two_a', 3 => 'three_a');
	      $array2 = array(1 => 'one_b', 3 => 'three_b', 4 => 'four_b');
	      $result = $array1 + $array2;
	      var_dump($result);
	      ?>

	       The keys from the first array will be preserved. If an array key exists in both arrays, then the element from the first array  will
	      be used and the matching key's element from the second array will be ignored.

	      array(5) {
		[0]=>
		string(6) "zero_a"
		[2]=>
		string(5) "two_a"
		[3]=>
		string(7) "three_a"
		[1]=>
		string(5) "one_b"
		[4]=>
		string(6) "four_b"
	      }

       Example #3

	      array_merge(3) with non-array types

	      <?php
	      $beginning = 'foo';
	      $end = array(1 => 'bar');
	      $result = array_merge((array)$beginning, (array)$end);
	      print_r($result);
	      ?>

	      The above example will output:

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

SEE ALSO

       array_merge_recursive(3), array_replace(3), array_combine(3), array operators.

PHP Documentation Group 													    ARRAY_MERGE(3)