How Can I Efficiently Sum the Values in a 2D Array's Column in PHP?

Summing Values in a 2D Array's Column Efficiently

Consider an array of user data with "f_count" and "uid" fields. To sum values in the "f_count" column without using a foreach loop, the following techniques offer effective solutions:

In PHP versions 5.5 , utilize the array_column() and array_sum() functions, which provide an elegant solution:

$value = array_sum(array_column($arr, 'f_count'));

Another efficient approach for PHP 5.4 and above employs array_reduce() in conjunction with an anonymous function:

$value = array_reduce($arr, function ($carry, $item) {
    return $carry + $item['f_count'];
}, 0);

Both techniques avoid iterative loops, resulting in improved performance.

Alternatively, modifying the database query to return a flattened array can also eliminate the need for further processing:

$query = "SELECT SUM(f_count) AS total_f_count FROM users WHERE gid=:gid";

This query will return a single row containing the sum of f_counts, rendering subsequent array manipulation unnecessary.

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