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up vote 0 down vote favorite

My input is

$array2 = array("b" => "green","red");

Array for search

$array1 = array("a" => "green", "green","red", "red", "red");

Output of array1:

Array
(
    [0] => green
)

I need a function finds values in the first array which exist at least three times. These values will be unset from the second array.

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1  
My result is empty Array ( ) not green –  Bora Jun 23 at 9:20
    
@bora same here. eval.in/166020 –  Déjà vu Jun 23 at 9:23
    
It's unclear what you're asking. Please rephrase your question. –  nl-x Jun 23 at 9:26
    
Please specify your input and the expected outcome. –  colburton Jun 23 at 9:29
    
Do you want to remove only triple repetition values, not duplicate? –  Bora Jun 23 at 9:32
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2 Answers

up vote 0 down vote 
$array1 = array_unique($array1);

Please do some reserach on your own and provide tangible efforts to solve the issue. In order to remove duplicate entries, there's a pre-written function called array_unique. You can read about it on php.net

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up vote 0 down vote

The function array_count_values returns an array using the values of the input array as keys and their frequency in it as values (see here).

So, to solve your problem you could use the following function, which is based on array_count_values:

function checkDuplicates($filter,$list,$duplicates = 2)
{
    $frequencies = array_count_values($list);
    $uniques = array_unique($list);
    $result = array();
    foreach($uniques as $value)
    {
        if(!in_array($value,$filter) or $frequencies[$value]<$duplicates)
        {
            $result[] = $value;
        }
    }
    return $result;
}

and call it as follows:

checkDuplicates($array2,$array1,3);

See it working here

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