PHP - checking for duplicate values in an array

Question

The values in this array are inserted by pulling XML values (using the simplexml_load_file method) and a foreach loop.

$skuArray(2, 4, 3, 7, 7, 4, 1, 7, 9);

After populating the array, I then need to check to see if any duplicate values exist in the array (IE, 7 and 4 in this case). Product->sku contains the skuArray value (from an XML file) in the foreach loop below. The code below isn't working. Any advice? Thanks!

foreach($XMLproducts->product as $Product) {
if (in_array($Product->sku, $skuArray, > 1) {
// execute code
}
}

what do you want to do with the duplicated? remove? store? count? — user557846
– user557846, Commented Mar 17, 2014 at 23:58
possible duplicate of Php check duplicate values in an array — Mariano Córdoba
– Mariano Córdoba, Commented Mar 18, 2014 at 0:11

John Conde · Accepted Answer · 2014-03-17 23:59:28Z

0

Use array_count_values() to get the number of times a value occurs and then check to see if it is more than one

$skuArray = array(2, 4, 3, 7, 7, 4, 1, 7, 9);
$dupes = array_count_values($skuArray);    
foreach($XMLproducts->product as $Product) {
  if ($dupes[$Product->sku] > 1) {
    // execute code
   }
}

answered Mar 17, 2014 at 23:59

John Conde

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1 Comment

Dean Olsen Over a year ago

Thanks! This code should work, but for some reason it isn't. Perhaps because using the simplexml_load_file method may not be pulling a numeric value to test in the if statement (if > 1).

Community · Accepted Answer · 2017-05-23 10:25:04Z

0

If you need to remove the duplicates then you can use array_unique:

<?php
$input = array(4, 4, 3, 4, 3, 3);
$result = array_unique($input);
// $result = array(4, 3)
?>

If you need only check if there are duplicates then you can do it using array_count_values:

<?php
$input = array(2, 4, 3, 7, 7, 4, 1, 7, 9);
$counts = array_count_values($input);
$duplicates = array();
foreach($counts as $v => $count){
    if($count > 1)
        $duplicates[] = $v;
}

Then you will have an array $duplicates with the duplicated values.

Source: Php check duplicate values in an array

edited May 23, 2017 at 10:25

CommunityBot

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answered Mar 18, 2014 at 0:07

Mariano Córdoba

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2 Comments

Dean Olsen Over a year ago

Thanks! This code should work, but for some reason it isn't. Perhaps because using the simplexml_load_file method may not be pulling a numeric value to test in the if statement (if > 1).

Mariano Córdoba Over a year ago

Are you sure that the format of the array is like array(2, 4, 3, 7, 7, 4, 1, 7, 9)? Here you can see this code working.

David Lin · Accepted Answer · 2014-03-18 00:09:42Z

0

Your code has typo:

if (in_array($Product->sku, $skuArray, > 1) {

in_array expect the first parameter the needle, but you mentioned "Product->sku contains the skuArray value ", anyway, it should be like this:

if (in_array($Product->sku, $skuArray)) {

answered Mar 18, 2014 at 0:09

David Lin

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