How Can I Efficiently Detect and Display Duplicate Values and Their Counts in a PHP Array?

Detect and Display Duplicate Values in an Array

Working with an array in PHP, the task at hand is to identify and count duplicate values, presenting the results in a clear manner. Given an array containing various fruit names, the desired output is a format that displays each unique value with the number of its occurrences.

For instance, consider the following array:

$array = [
    'apple',
    'orange',
    'pear',
    'banana',
    'apple',
    'pear',
    'kiwi',
    'kiwi',
    'kiwi'
];

The expected output would resemble the following:

apple (2)
orange
pear (2)
banana
kiwi (3)

Solution: Utilizing the array_count_values Function

To achieve this, we can effectively utilize the array_count_values function. This function takes an array as its input and returns an array where the keys represent the original array's values, and the values represent the number of occurrences for each key.

Implementing this function is straightforward. Consider the following PHP code:

$array = [
    'apple',
    'orange',
    'pear',
    'banana',
    'apple',
    'pear',
    'kiwi',
    'kiwi',
    'kiwi'
];

$counts = array_count_values($array);

foreach ($counts as $fruit => $count) {
    echo "$fruit ($count)\n";
}

Executing this code will produce the desired output:

apple (2)
orange (1)
pear (2)
banana (1)
kiwi (3)

Conclusion

The array_count_values function provides an efficient means to determine the number of occurrences for each unique value within an array. By employing this function, developers can easily detect and count duplicate values, enabling more comprehensive analysis and manipulation of array data.

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