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                                   in_array

   (PHP 4 )
   in_array -- Checks if a value exists in an array

Description

   bool in_array ( mixed needle, array haystack [, bool strict])

   Searches haystack for needle and returns TRUE if it is found in the
   array, FALSE otherwise.

   If the third parameter strict is set to TRUE then the in_array()
   function will also check the types of the needle in the haystack.

     Note: If needle is a string, the comparison is done in a
     case-sensitive manner.

     Note: In PHP versions before 4.2.0 needle was not allowed to be an
     array.

   Example 1. in_array() example
   <?php
   $os = array("Mac", "NT", "Irix", "Linux");
   if (in_array("Irix", $os)) {
       echo "Got Irix";
   }
   if (in_array("mac", $os)) {
       echo "Got mac";
   }
   ?>

   The second condition fails because in_array() is case-sensitive, so
   the program above will display:
   Got Irix

   Example 2. in_array() with strict example
   <?php
   $a = array('1.10', 12.4, 1.13);
   if (in_array('12.4', $a, true)) {
       echo "'12.4' found with strict check\n";
   }
   if (in_array(1.13, $a, true)) {
       echo "1.13 found with strict check\n";
   }
   ?>

   This will display:
   1.13 found with strict check

   Example 3. in_array() with an array as needle
   <?php
   $a = array(array('p', 'h'), array('p', 'r'), 'o');
   if (in_array(array('p', 'h'), $a)) {
       echo "'ph' was found\n";
   }
   if (in_array(array('f', 'i'), $a)) {
       echo "'fi' was found\n";
   }
   if (in_array('o', $a)) {
       echo "'o' was found\n";
   }
   ?>

   Outputs:
'ph' was found
  'o' was found

   See also array_search(), array_key_exists(), and isset().
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