sort(3) [php man page]

SORT(3) 								 1								   SORT(3)

sort - Sort an array

SYNOPSIS

       bool sort (array  &$array, [int	$sort_flags = SORT_REGULAR])

DESCRIPTION

	This function sorts an array. Elements will be arranged from lowest to highest when this function has completed.

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. It uses the locale, which can be changed using
		       setlocale(3)

		     o SORT_NATURAL - compare items as strings using "natural ordering" like natsort(3)

		     o SORT_FLAG_CASE - can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

CHANGELOG

       +--------+---------------------------------------------------+
       |Version |						    |
       |	|						    |
       |	|		     Description		    |
       |	|						    |
       +--------+---------------------------------------------------+
       | 5.4.0	|						    |
       |	|						    |
       |	|  Added    support    for     SORT_NATURAL	and |
       |	| SORT_FLAG_CASE as $sort_flags 		    |
       |	|						    |
       | 5.0.2	|						    |
       |	|						    |
       |	|	       Added SORT_LOCALE_STRING 	    |
       |	|						    |
       +--------+---------------------------------------------------+
EXAMPLES

       Example #1

	      sort(3) example

	      <?php

	      $fruits = array("lemon", "orange", "banana", "apple");
	      sort($fruits);
	      foreach ($fruits as $key => $val) {
		  echo "fruits[" . $key . "] = " . $val . "
";
	      }

	      ?>

	      The above example will output:

	      fruits[0] = apple
	      fruits[1] = banana
	      fruits[2] = lemon
	      fruits[3] = orange

	The fruits have been sorted in alphabetical order.

       Example #2

	      sort(3) example using case-insensitive natural ordering

	      <?php

	      $fruits = array(
		  "Orange1", "orange2", "Orange3", "orange20"
	      );
	      sort($fruits, SORT_NATURAL | SORT_FLAG_CASE);
	      foreach ($fruits as $key => $val) {
		  echo "fruits[" . $key . "] = " . $val . "
";
	      }

	      ?>

	      The above example will output:

	      fruits[0] = Orange1
	      fruits[1] = orange2
	      fruits[2] = Orange3
	      fruits[3] = orange20

	The fruits have been sorted like natcasesort(3).

NOTES

       Note

	      This  function assigns new keys to the elements in $array. It will remove any existing keys that may have been assigned, rather than
	      just reordering the keys.

       Note

	       Like most PHP sorting functions, sort(3) uses an implementation of Quicksort. The pivot is chosen in the middle	of  the  partition
	      resulting in an optimal time for already sorted arrays. This is however an implementation detail you shouldn't rely on.

       Warning

	       Be careful when sorting arrays with mixed types values because sort(3) can produce unpredictable results.

SEE ALSO

       asort(3), The comparison of array sorting functions.

PHP Documentation Group 														   SORT(3)

Check Out this Related Man Page

COUNT(3)								 1								  COUNT(3)

count - Count all elements in an array, or something in an object

SYNOPSIS

       int count (mixed  $array_or_countable, [int  $mode = COUNT_NORMAL])

DESCRIPTION

	Counts all elements in an array, or something in an object.

	For  objects,  if  you	have  SPL installed, you can hook into count(3) by implementing interface Countable. The interface has exactly one
       method, Countable::count, which returns the return value for the count(3) function.

	Please see the Array section of the manual for a detailed explanation of how arrays are implemented and used in PHP.

PARAMETERS

	      o $array_or_countable
		- An array or Countable object.

	      o $mode
		- If the optional $mode parameter is set to COUNT_RECURSIVE (or 1), count(3) will recursively count the array.	This  is  particu-
		larly useful for counting all the elements of a multidimensional array.

	      Caution

		     count(3)  can  detect  recursion  to avoid an infinite loop, but will emit an E_WARNING every time it does (in case the array
		     contains itself more than once) and return a count higher than may be expected.

RETURN VALUES

	Returns the number of elements in $array_or_countable. If the parameter is not an array or not an object with implemented Countable inter-
       face, 1 will be returned. There is one exception, if $array_or_countable is NULL, 0 will be returned.

       Caution

	      count(3) may return 0 for a variable that isn't set, but it may also return 0 for a variable that has been initialized with an empty
	      array. Use isset(3) to test if a variable is set.

EXAMPLES

       Example #1

	      count(3) example

	      <?php
	      $a[0] = 1;
	      $a[1] = 3;
	      $a[2] = 5;
	      $result = count($a);
	      // $result == 3

	      $b[0]  = 7;
	      $b[5]  = 9;
	      $b[10] = 11;
	      $result = count($b);
	      // $result == 3

	      $result = count(null);
	      // $result == 0

	      $result = count(false);
	      // $result == 1
	      ?>

       Example #2

	      Recursive count(3) example

	      <?php
	      $food = array('fruits' => array('orange', 'banana', 'apple'),
			    'veggie' => array('carrot', 'collard', 'pea'));

	      // recursive count
	      echo count($food, COUNT_RECURSIVE); // output 8

	      // normal count
	      echo count($food); // output 2

	      ?>

SEE ALSO

       is_array(3), isset(3), strlen(3).

PHP Documentation Group 														  COUNT(3)

Linux and UNIX Man Pages

sort(3) [php man page]

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