How can the function getConfigAttribute() be utilized to simplify access to specific attributes within a multidimensional configuration array in PHP?

When dealing with a multidimensional configuration array in PHP, it can be cumbersome to access specific attributes deep within the array. To simplify this process, you can create a function like getConfigAttribute() that takes the configuration array, a key path, and a default value as parameters. This function will traverse the array using the key path and return the value if found, or the default value if not found. 

function getConfigAttribute($config, $keyPath, $default = null) {
    $keys = explode('.', $keyPath);
    $value = $config;
    
    foreach ($keys as $key) {
        if (isset($value[$key])) {
            $value = $value[$key];
        } else {
            return $default;
        }
    }
    
    return $value;
}

// Example usage
$config = [
    'database' => [
        'host' => 'localhost',
        'username' => 'root',
        'password' => 'password123'
    ]
];

$host = getConfigAttribute($config, 'database.host', 'default_host');
echo $host; // Output: localhost

$username = getConfigAttribute($config, 'database.user', 'default_user');
echo $username; // Output: default_user

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