Why do the Write-Host outside of the function work different than inside of the function?
It seems like somehow the parameters variables are changing from what I declared it to be...
function a([string]$svr, [string]$usr) {
    $x = "$svr\$usr"
    Write-Host $x
}
$svr = 'abc'
$usr = 'def'
Write-Host "$svr\$usr"  # abc\def
a($svr, $usr)           # abc def
                PowerShell uses the parameter value order to associate each parameter value with a parameter in the function. When you use positional parameters, type one or more values after the function name. Positional parameter values are assigned to the $args array variable.
Passing arguments in PowerShell is the same as in any other shell: you just type the command name, and then each argument, separated by spaces. If you need to specify the parameter name, you prefix it with a dash like -Name and then after a space (or a colon), the value.
% is an alias for the ForEach-Object cmdlet. An alias is just another name by which you can reference a cmdlet or function.
Don't call functions or cmdlets in PowerShell with parentheses and commas (only do this in method calls)!
When you call a($svr, $usr) you're passing an array with the two values as the single value of the first parameter. It's equivalent to calling it like a -svr $svr,$usr which means the $usr parameter is not specified at all. So now $x equals the string representation of the array (a join with spaces), followed by a backslash, followed by nothing.
Instead call it like this:
a $svr $usr
a -svr $svr -usr $usr
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