key(3) [php man page]

KEY(3)									 1								    KEY(3)

key - Fetch a key from an array

SYNOPSIS

       mixed key (array  &$array)

DESCRIPTION

       key(3) returns the index element of the current array position.

PARAMETERS

	      o $array
		- The array.

RETURN VALUES

	The  key(3)  function  simply  returns the key of the array element that's currently being pointed to by the internal pointer. It does not
       move the pointer in any way. If the internal pointer points beyond the end of the elements list or the array is empty, key(3) returns NULL.

EXAMPLES

       Example #1

	      key(3) example

	      <?php
	      $array = array(
		  'fruit1' => 'apple',
		  'fruit2' => 'orange',
		  'fruit3' => 'grape',
		  'fruit4' => 'apple',
		  'fruit5' => 'apple');

	      // this cycle echoes all associative array
	      // key where value equals "apple"
	      while ($fruit_name = current($array)) {
		  if ($fruit_name == 'apple') {
		      echo key($array).'<br />';
		  }
		  next($array);
	      }
	      ?>

	      The above example will output:

	      fruit1<br />
	      fruit4<br />
	      fruit5<br />

SEE ALSO

       current(3), next(3).

PHP Documentation Group 														    KEY(3)

ASORT(3)								 1								  ASORT(3)

asort - Sort an array and maintain index association

SYNOPSIS

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

DESCRIPTION

	This  function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is
       used mainly when sorting associative arrays where the actual element order is significant.

PARAMETERS

	      o $array
		- The input array.

	      o $sort_flags
		- You may modify the behavior of the sort using the optional parameter $sort_flags, for details see sort(3).

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      asort(3) example

	      <?php
	      $fruits = array("d" => "lemon", "a" => "orange", "b" => "banana", "c" => "apple");
	      asort($fruits);
	      foreach ($fruits as $key => $val) {
		  echo "$key = $val
";
	      }
	      ?>

	      The above example will output:

	      c = apple
	      b = banana
	      d = lemon
	      a = orange

	       The fruits have been sorted in alphabetical order, and the index associated with each element has been maintained.

SEE ALSO

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

PHP Documentation Group 														  ASORT(3)