PHP - If Session Active, Else...

    $psScriptPath = 'C:/Apache/PSScripts/' //Path outside Website Root

    $rand = mt_rand(mt_getrandmax(),mt_getrandmax());
   
    //UTF-8 Standard only
    $username = utf8_decode($_POST["username"]);
    $password = utf8_decode($_POST["password"]);

    $base64_username = base64_encode($username); //Transport Layer Base64
    $base64_password = base64_encode($password); //Transport Layer Base64

    //The danger happens here as it is sent to powershell.
    $query = shell_exec('powershell.exe -ExecutionPolicy ByPass -command "' . $psScriptPath . '" < NUL  -rand "' . $rand . '" < NUL -base64_username "' . $base64_username . '" < NUL -base64_password "' . $base64_password . '" < NUL');// Execute the PowerShell script, passing the parameters

#*=============================================================================
#* Script Name: adpwchange2014.ps1
#* Created: 2014-10-07
#* Author:
#* Purpose: This is a simple script that queries AD users.
#* Reference Website: http://theboywonder.co.uk/2012/07/29/executing-powershell-using-php-and-iis/
#* 
#*=============================================================================

#*=============================================================================
#* PARAMETER DECLARATION
#*=============================================================================
param(
[string]$base64_username,
[string]$base64_password,
[string]$rand
)

#*=============================================================================
#* IMPORT LIBRARIES
#*=============================================================================

if ((Get-Module | where {$_.Name -match "ActiveDirectory"}) -eq $null){
	#Loading module
	Write-Host "Loading module AcitveDirectory..."
	Import-Module ActiveDirectory
	}else{
	write-output "Error: Please install ActiveDirectory Module"
	EXIT
	NUL
	Stop-Process -processname powershell*
	}
#*=============================================================================
#* PARAMETERS
#*=============================================================================
$username = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64_username))
$password = [System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($base64_password))
	
#*=============================================================================
#* INITIALISE VARIABLES
#*=============================================================================
# Increase buffer width/height to avoid PowerShell from wrapping the text before
# sending it back to PHP (this results in weird spaces).
$pshost = Get-Host
$pswindow = $pshost.ui.rawui
$newsize = $pswindow.buffersize
$newsize.height = 1000
$newsize.width = 300
$pswindow.buffersize = $newsize

#*=============================================================================
#* EXCEPTION HANDLER
#*=============================================================================

#*=============================================================================
#* FUNCTION LISTINGS
#*=============================================================================

    Function Test-ADAuthentication {
		Param($Auth_User, $Auth_Pass)
		Write-Output "Running Function Test-ADAuthenication"
		$domain = $env:USERDOMAIN
		
		Add-Type -AssemblyName System.DirectoryServices.AccountManagement
		$ct = [System.DirectoryServices.AccountManagement.ContextType]::Domain
		$pc = New-Object System.DirectoryServices.AccountManagement.PrincipalContext($ct, $domain)
		$pc.ValidateCredentials($Auth_User, $Auth_Pass).ToString()
		}

#*=============================================================================
#* SCRIPT BODY
#*=============================================================================
Write-Output $PSVersionTable
Write-Output "	"
$authentication = Test-ADAuthentication "$username" "$password"
if ($authentication -eq $TRUE) {
	Write-Output "Success:$rand Authentication"
	}elseif ($authentication -eq $FALSE) {
	Write-Output "Failed:$rand Authentication"
	}else {
	Write-Output "Error: EOS"
	EXIT
	NUL
	Stop-Process -processname powershell*
	}
	
#*=============================================================================
#* SCRIPT Exit
#*=============================================================================
Write-Output "End Of Script"
EXIT
NUL
Stop-Process -processname powershell*