Question

How to count the numbers with even number of digits in an array with PHP

Answer 1

function count_even_numbers($arr) {
    $result = 0;
    $size = count($arr);
    
    for ($i = 0; $i < $size; $i++) {
        $total_digits = (int)(log10($arr[$i])) + 1;
        if ($total_digits % 2 == 0) {
            $result++;
        }
    }
    
    return $result;
}
        
$array = array(564, 90, 7, 1248, 47325, 834921, 1234567);
        
echo count_even_numbers($array);



/*
run:

3

*/

 

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