Question 173852 in PHP Question posted in
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Extracting Reoccurring Values From PHP Array

I have an array that contains duplicate IDs, which need to be extracted, but only if there is a total equal to X.

X will vary and would need to be set as a variable in the function.

In this example, X is equal to 3;

Array
(
    [0] => 189
    [1] => 185
    [2] => 188
    [3] => 178
    [4] => 189
    [5] => 190
    [6] => 185
    [7] => 186
    [8] => 191
    [9] => 188
    [10] => 187
    [11] => 180
    [12] => 182
    [13] => 181
    [14] => 183
    [15] => 184
    [16] => 177
    [17] => 178
    [18] => 189
    [19] => 185
    [20] => 188
    [21] => 180
    [22] => 178
)

As such, the extracted result should be;

Array
(
    [1] => 178
    [2] => 185
    [3] => 188
)

Is there a simple loop or PHP function to handle this type of data extraction?

Many thanks!

Tags:

3

Answers


  1. 0

    You can use array_count_values to get the count of the values. Then use array_filter with a custom call back to return the duplicates.

    Then a simple for each to find and unset values in the array that are less than your passed value.

    Last just return the array_keys from the array.

    $array = [189,185,188,178,189,190,185,186,191,188,187,180,182,181,183,184177,178,189,185,188,180,178];

function justDupes($dupeCount, $array){
    $r = array_filter(array_count_values($array), function($v) { return $v > 1; });
    foreach($r as $k => $v){
        if($v < $dupeCount){
            unset($r[$k]);
        }
    }
    return array_keys($r);
}

print_r(justDupes(3, $array));
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  2. 0 
    $input = [
  189,
  185,
  188,
  178,
  189,
  190,
  185,
  186,
  191,
  188,
  187,
  180,
  182,
  181,
  183,
  184,
  177,
  178,
  189,
  185,
  188,
  180,
  178
];

$x = 3;

$result = array_keys(
  array_filter(
    array_count_values($input),
    static fn(int $count): bool => $count === $x
  )
);
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  3. 0

    You could use array_count_values()

    Here is the solution, and actually you have four values that are duplicated 3 times and not three.

    <?php

$x = 3;

$data = array(
189, 185, 188, 178, 189, 190, 185, 186, 191, 188, 187, 180, 182, 181, 183, 184, 177, 178, 189, 185, 188, 180, 178
);

echo '<pre>';
print_r(extract_duplicated_values($data,$x));



//Function description
function extract_duplicated_values($data, $x)
{
$count = array_count_values($data);
$output = [];
foreach ($count as $key => $value) {
    if ($value == $x) {
        $output[] = $key;
    }
}
return $output;
}
?>
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