param (
    $p1,
    [String]$Input_1
)

function test {
    $args
    foreach($arg in $args) {
        switch($arg) {
            '-h' { 'I got: -h' }
            '--help' { 'I got: --help' }
            default { "I got something: $arg" }
        }
    }
}

test($p1)