Calculate_mean_and_concatenate_string.php

<?php
/**
 * You will be given an array which will include both integers and characters.
 * Return an array of length 2 with a[0] representing the mean of the ten integers as a floating point number. 
 * There will always be 10 integers and 10 characters. Create a single string with the characters and return it as a[1] while maintaining the original order.
 * 
 * lst = ['u', '6', 'd', '1', 'i', 'w', '6', 's', 't', '4', 'a', '6', 'g', '1', '2', 'w', '8', 'o', '2', '0']
 * 
 * Here is an example of your return
 * 
 * [3.6, "udiwstagwo"]
 * 
 * In C# and Java the mean return is a double.
 * 
 */

 function mean(array $a): array {
    $numeros = 10;
    $suma = 0;
    $cadena = "";

    foreach ($a as $valor) {
        is_numeric($valor) ? $suma += $valor : $cadena .= $valor;  
    }

    return [$suma / $numeros, $cadena];
}