Using PHP's array_count_values() Function to Count Value Occurrences

PHP is a widely used scripting language for web development, command‑line interfaces, and embedded applications, known for its ease of use and efficiency.

In PHP, functions are reusable code blocks; a particularly useful one is array_count_values(), which counts how many times each value appears in an array.

Usage

The syntax of the function is: array_count_values(array $array): array The function accepts an array and returns an associative array where each key is a unique value from the input and each value is the count of occurrences.

Parameter Description

array : required. The array whose values are to be counted.

Return Value

An associative array mapping each unique value to its number of occurrences.

Examples

Example 1 demonstrates counting colors in an array:

$colors = array("red", "blue", "green", "blue", "yellow", "red", "green", "red");
$color_count = array_count_values($colors);
print_r($color_count);

Output:

Array
(
    [red] => 3
    [blue] => 2
    [green] => 2
    [yellow] => 1
)

Example 2 shows counting words in a sentence:

$text = "The quick brown fox jumps over the lazy dog";
$word_array = explode(" ", $text);
$word_count = array_count_values($word_array);
print_r($word_count);

Output:

Array
(
    [The] => 1
    [quick] => 1
    [brown] => 1
    [fox] => 1
    [jumps] => 1
    [over] => 1
    [the] => 1
    [lazy] => 1
    [dog] => 1
)

Notes

The function is case‑insensitive, treating values with different cases as the same key.

It is type‑sensitive; string "2" is converted to integer 2 before counting.

If the argument is not an array, the function returns false.

Conclusion

The array_count_values() function provides a quick way to tally the frequency of each value in a PHP array, making it a valuable tool for developers working on web applications and other PHP projects.