   #PHP Manual Array Functions array_intersect array_keys

   PHP Manual
   Prev  Next
   ______________________________________________________________________

                               array_key_exists

   (PHP 4 >= 4.1.0)
   array_key_exists -- Checks if the given key or index exists in the
   array

Description

   bool array_key_exists ( mixed key, array search)

   array_key_exists() returns TRUE if the given key is set in the array.
   key can be any value possible for an array index.

   Example 1. array_key_exists() example
   <?php
   $search_array = array("first" => 1, "second" => 4);
   if (array_key_exists("first", $search_array)) {
       echo "The 'first' element is in the array";
   }
   ?>

     Note: The name of this function is key_exists() in PHP version
     4.0.6.

   See also isset(), array_keys(), and in_array().
   ______________________________________________________________________

   Prev            Home       Next
   array_intersect  Up  array_keys
