   #PHP Manual Array Functions in_array krsort

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                                      key

   (PHP 3, PHP 4 )
   key -- Fetch a key from an associative array

Description

   mixed key ( array array)

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

   Example 1. key() 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);
   }
   ?>

   See also current() and next().
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