Difference between two arrays, PHP?

aej1973
aej1973 used Ask the Experts™
on
Hi, I have two arrays:

array1=(200,201,202,203)
array2=(200,201)
 
What do I do to get the difference of the array to be (202,203). When I run the array_diff function I get the result as (200,201) and this is not my desired result. Thanks for the help.

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<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);
?>

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result

Array
(
    [1] => blue
)


source

http://php.net/manual/en/function.array-diff.php
array_idff will give diff only
<?php
$array1 = array("a" => "green", "red", "blue", "red");
$array2 = array("b" => "green", "yellow", "red");
$result = array_diff($array1, $array2);

print_r($result);
?>

refer
http://php.net/manual/en/function.array-diff.php

share your code to see in detail
To anybody wanting a double-sided array_diff - mentioned by rudigier at noxx dot at. Remember, array_diff gives you everything in the first array that isn't in the subsequent arrays.

$array1=array('blue','red','green');
$array2=array('blue','yellow','green');

array_merge(array_diff($array1, $array2),array_diff($array2, $array1));

Result
------
Array
(
    [0] => red
    [1] => yellow
)
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Dave BaldwinFixer of Problems
Most Valuable Expert 2014

Commented:
Works fine from here so you'll have to show some code to see what you're doing differently.

Author

Commented:
Thank you for getting back to me. As I had mentioned in my question I tried array_diff and it does not work. I have attached my code for your reference. Is there any other way this can be done?
 $extens= $_GET['extsn']; //comma seperated values; 200,201
        $extss = explode(",",$extens); //puts it into an array
        echo "The nums to delete :".$extens;

        /**********get existing extens from the DB*********/

         $stmt = $db->query("SELECT val from queues where name='extension' and id='$group_number'");
         $row = $stmt->fetch(PDO::FETCH_ASSOC);
         $existing_exts= implode(",",$row); //200,201,202,203

         echo "Existing nos ".$existing_exts;
        /*****End************/


          $exten_array =array_diff($extss,$row);
          $exten_nos=implode(",",$exten_array);
          echo "difference is :". $exten_nos; //output is 200,201

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Commented:
As per PHP manual, array_diff Returns an array containing all the entries from array1 that are not present in any of the other arrays.


But you can also build your own simple function like this:

function arrDiff($arr1, $arr2){
  foreach($arr1 as $key=>$value){
   if (!array_search($value, $arr2)){
     $result[]=$value;
   }
 }
if (count($result)>0){ // it will only return 0 if $result is NULL, if it's a string it will be 1!!!!
 return $result;
} else {
 return false;
}
}

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Most Valuable Expert 2011
Top Expert 2016
Commented:
Questions like this scream out for SSCCE.
<?php // RAY_temp_aej1973.php
error_reporting(E_ALL);
echo '<pre>';

// http://php.net/manual/en/function.array-diff.php

$array1 = array(200,201,202,203);
$array2 = array(200,201);

var_dump( array_diff($array1, $array2) );
var_dump( array_diff($array2, $array1) );

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Author

Commented:
Hello all, thank you for your inputs. I had made a mistake because of which array_diff was giving me a wrong output, it works now. Thank you.

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