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_SPLICE(3) 							 1							   ARRAY_SPLICE(3)

array_splice - Remove a portion of the array and replace it with something else

SYNOPSIS

       array array_splice (array  &$input, int	$offset, [int  $length], [mixed  $replacement = array()])

DESCRIPTION

	Removes  the  elements	designated  by	$offset and $length from the $input array, and replaces them with the elements of the $replacement
       array, if supplied.

	Note that numeric keys in $input are not preserved.

       Note

	       If $replacement is not an array, it will be typecast to one (i.e. (array) $parameter). This may result in unexpected behavior  when
	      using an object or NULL$replacement.

PARAMETERS

	      o $input
		- The input array.

	      o $offset
		- If $offset is positive then the start of removed portion is at that offset from the beginning of the $input array. If $offset is
		negative then it starts that far from the end of the $input array.

	      o $length
		- If $length is omitted, removes everything from $offset to the end of the array. If $length is specified and  is  positive,  then
		that  many elements will be removed. If $length is specified and is negative then the end of the removed portion will be that many
		elements from the end of the array. If $length is specified and is zero, no elements will be removed. Tip:  to	remove	everything
		from $offset to the end of the array when $replacement is also specified, use count($input) for $length.

	      o $replacement
		-  If  $replacement  array  is	specified,  then  the removed elements are replaced with elements from this array.  If $offset and
		$length are such that nothing is removed, then the elements from the $replacement array are inserted in the place specified by the
		$offset.  Note	that  keys in replacement array are not preserved.  If $replacement is just one element it is not necessary to put
		array() around it, unless the element is an array itself, an object or NULL.

RETURN VALUES

	Returns the array consisting of the extracted elements.

EXAMPLES

       Example #1

	      array_splice(3) examples

	      <?php
	      $input = array("red", "green", "blue", "yellow");
	      array_splice($input, 2);
	      // $input is now array("red", "green")

	      $input = array("red", "green", "blue", "yellow");
	      array_splice($input, 1, -1);
	      // $input is now array("red", "yellow")

	      $input = array("red", "green", "blue", "yellow");
	      array_splice($input, 1, count($input), "orange");
	      // $input is now array("red", "orange")

	      $input = array("red", "green", "blue", "yellow");
	      array_splice($input, -1, 1, array("black", "maroon"));
	      // $input is now array("red", "green",
	      //	  "blue", "black", "maroon")

	      $input = array("red", "green", "blue", "yellow");
	      array_splice($input, 3, 0, "purple");
	      // $input is now array("red", "green",
	      //	  "blue", "purple", "yellow");
	      ?>

       Example #2

	      array_splice(3) examples

	       The following statements change the values of $input the same way:

	      <?php
	      array_push($input, $x, $y);
	      array_splice($input, count($input), 0, array($x, $y));
	      array_pop($input);
	      array_splice($input, -1);
	      array_shift($input);
	      array_splice($input, 0, 1);
	      array_unshift($input, $x, $y);
	      array_splice($input, 0, 0, array($x, $y));
	      $input[$x] = $y; // for arrays where key equals offset
	      array_splice($input, $x, 1, $y);
	      ?>

SEE ALSO

       array_slice(3), unset(3), array_merge(3).

PHP Documentation Group 													   ARRAY_SPLICE(3)