Echo only the duplicate values of array_count_values result php

Question

After both myself and a friend searching for hours upon end, and trying numerous things we are unable to find out how to echo only the duplicate values of array_count_values result. I will break it down:

We have numerous select boxes, which build the array when sent via GET, for example:

    <div class="form-group col-sm-2 mb-sm">
            <select name="select[]" class="form-control">
                <option value="" disabled="" selected="">Select</option>
                <option value="optionOne">Option 1</option>
                <option value="optionTwo">Option 2</option>
            </select>
        </div>
        <div class="form-group col-sm-2 mb-sm">
            <select name="select[]" class="form-control">
                <option value="" disabled="" selected="">Select</option>
                <option value="optionOne">Option 1</option>
                <option value="optionTwo">Option 2</option>
            </select>
        </div>
        <div class="form-group col-sm-2 mb-sm">
            <select name="select[]" class="form-control">
                <option value="" disabled="" selected="">Select</option>
                <option value="optionOne">Option 1</option>
                <option value="optionTwo">Option 2</option>
            </select>
        </div>

We are then doing the following:

if (max(array_count_values($_GET['select'])) == 2) {
   $twoSelected = '2 of the selections are the same, which were (DUPLICATE SELECTION HERE)';
}

We have tried a foreach loop, but can't seem to get it to work.

Any help will be very much appreciated.

Kind Regards

can post your get parameter $_GET['select'] array value here — JYoThI
– JYoThI, Commented Jun 22, 2017 at 10:22
All you need to do is loop over the result of array_count_values, and output all the keys that have a value > 1. — C3roe
– C3roe, Commented Jun 22, 2017 at 10:29
@JYoThI Thank you but I have accepted an answer, I would've thought you could tell what the var_dump would output from the select boxes that I added in to the post, sorry. — DisplayName
– DisplayName, Commented Jun 22, 2017 at 10:37

MisterX · Accepted Answer · 2017-06-22 10:26:33Z

2

Try this one

$array = array("test", "hello", "test", "world", "hello");

$duplicatedValuesArray = array_keys(array_filter(array_count_values($array), function($v) {
    return $v > 1;
}));

echo implode(', ',$duplicatedValuesArray);

answered Jun 22, 2017 at 10:26

MisterX

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1 Comment

DisplayName Over a year ago

This is perfect thank you. I would up-vote it but someone down-voted my post for some reason without even mentioning why so I now have less than 15 rep...

Avinash Kumar Singh · Accepted Answer · 2017-06-22 10:25:36Z

0

I think below code is helpful for you to get duplicate value.

$array = array(1=>'12334',2=>'123345',3 =>'Helloo' ,4=>'hello', 5=>'helloo');

// Convert every array value to uppercase, and remove all duplicate values
$notdublicates = array_unique(array_map("strtoupper", $array));

// The difference in the original array $array, and the $notdublicates array
// will be the duplicate values
$getduplicates = array_diff($array, $notdublicates);
print_r($getduplicates);

answered Jun 22, 2017 at 10:25

Avinash Kumar Singh

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