[Resolved] compare two arrays

[chucklarge]

Hi, I would like to compare two arrays. I want to compare the index of array 1 with the value of array 2 and get an intersect array of the index and value from array1. I hope i explained that. here is an example
array1

Array ( [0] => Array ( [setid] => 1 [setimage] => item1.jpg [setname] => item1 [numbersets] => 1 ) 
	[1] => Array ( [setid] => 3 [setimage] => item3.jpg [setname] => item3 [numbersets] => 1 ) 
	[2] => Array ( [setid] => 2 [setimage] => item2.jpg [setname] => item2 [numbersets] => 1 ) 
	[3] => Array ( [setid] => 2 [setimage] => item2.jpg [setname] => item2 [numbersets] => 4 ) 
	[4] => Array ( [setid] => 2 [setimage] => item2.jpg [setname] => item2 [numbersets] => 2 ) 
	[8] => Array ( [setid] => 3 [setimage] => item3.jpg [setname] => item3 [numbersets] => 1 ) 
	[9] => Array ( [setid] => 2 [setimage] => item2.jpg [setname] => item2 [numbersets] => 1 ) 
	[10] => Array ( [setid] => 1 [setimage] => item1.jpg [setname] => item1 [numbersets] => 1 ) 
	[11] => Array ( [setid] => 3 [setimage] => item3.jpg [setname] => item3 [numbersets] => 3 ) )

array2

Array ( [0] => 0 
	[1] => 2 
	[2] => 3
	[3] => 9
	[4] => 10) 

result array

Array ( [0] => Array ( [setid] => 1 [setimage] => item1.jpg [setname] => item1 [numbersets] => 1 )
	[2] => Array ( [setid] => 2 [setimage] => item2.jpg [setname] => item2 [numbersets] => 1 ) 
	[3] => Array ( [setid] => 2 [setimage] => item2.jpg [setname] => item2 [numbersets] => 4 ) 
	[9] => Array ( [setid] => 2 [setimage] => item2.jpg [setname] => item2 [numbersets] => 1 ) 
	[10] => Array ( [setid] => 1 [setimage] => item1.jpg [setname] => item1 [numbersets] => 1 ) )

I found this function [MAN]array_intersect_assoc[/MAN] but it seems to just compare indices. Does anyone have any suggestions? thanks Chuck

[chucklarge]

Hi,
Ok, I have modified array 2 so now the key and value are the same. So is there a function to compare keys of arrays?

array 2 is now like

Array ( [0] => 0  

    [2] => 2  

    [3] => 3 
    [9] => 9 
    [10] => 10)

[chucklarge]

Ahhh, I did find a function that does this
[MAN]array_intersect_key[/MAN] this function is only in the CVS releases however.

To use it in < CVS versions you must define this function

<?php

if (!function_exists("array_intersect_key")) {
  /**
   * Computes the intersection of arrays using keys for comparison
   *
   * implementation of PHP' CVS array_intersect_key()
   *
   * array_intersect_key() returns an array containing all the values
   * of array1 which have matching keys that are present in all the
   * arguments.
   *
   * might not be exactly equivalent with php.net/array_intersect_key
   * since we do not use === for comparison.
   *
   * will trigger an warning and return FALSE if one of the arguments
   * is not an array or if less than one argument is given.
   *
   * @see [url]http://php.net/array_intersect_key[/url]
   *
   * @author: The Anarcat
   * @license: public domain
   */
  function array_intersect_key() {
   $arrays =& func_get_args();
   // if only one array is given as argument, just return it
   if (count($arrays) == 1) return $arrays;
   elseif (count($arrays) < 1) {
     trigger_error("not enough arguments given, ".
                   count($arrays) ." given, > 1 needed", E_USER_WARNING);
     return FALSE;
   }
   $array1 = array_shift($arrays);
   foreach ($array1 as $key => $val) {
     for ($i = 0; $i < count($arrays); $i++) {
       $array =& $arrays[$i];
       if (!is_array($array)) {
         trigger_error("argument $i is not an array", E_USER_WARNING);
         return FALSE;
       }
       if (!isset($array[$key])) {
         unset($array1[$key]);
       }
     }
   }
   return $array1;
  }
}

?>