Why doesn't mysqldump work in php in a Windows Envinronment?

<?php
require_once '../classes/page.class.php';
 
class dbDump
extends page
{
	public function __construct()
	{
		parent::__construct();
 
		// Instantiate the user object
		$user = new user();
 
		// Make sure the user is logged in properly
		if (!$user->isAuthorized())
		{
			$this->redirect($this->getConfig('login_page'));
		}
 
		// Get requirements and verify they loaded correctly
		if (!stristr($_SERVER['HTTP_REFERER'], 'pages/adminManager.php'))
		{
			$this->append($this->error('Access denied to this location'));
 
			return;
		}
 
		// Get the database credentials
		$db = new db();
		$host = $db->getHost();
		$dbname = $db->getDbName();
		$user = $db->getUserName();
		$pass = $db->getPass();
 
		// Create the dump filename
		$date = date('h:i:s--m-d-Y');
		$backup_path = "../db_dumps/{$host}-{$dbname}-{$date}.sql";
 
		// Attempt the backup for a Linux environment
		$command = "mysqldump -f -C -K --host={$host} --user={$user} --password={$pass} $dbname >{$backup_path}";
		exec($command, $output, $error_code);
 
		// Check for errors
		if ($error_code != 0)
		{
			// Get the path to the mysqldump program
			$command = 'dir /b/s \mysqldump.exe';
			exec($command, $output, $error_code);
 
			// Check for errors
			if ($error_code != 0)
			{
				// Something is wrong but we don't know what
				$this->append($this->error("$command failed with an error code of $error_code"));
 
				return;
			}
 
			// Windows refuses to work with dashes and or colons in the file name
			$date = date('hismdY');
			$base_path = $this->getConfig('base_dir');
			$backup_path = "{$base_path}db_dumps/{$host}{$dbname}{$date}.sql";
 
			// Windows needs back slash paths instead of forward slash paths
			$path_array = explode('/', $backup_path);
			$backup_path = implode('\\', $path_array);
		
			// Attempt the backup for a Windows environment
			$command = "\"{$output[0]}\" -f -C -K --host={$host} --user={$user} --password={$pass} $dbname >\"{$backup_path}\"";
			exec($command, $output, $error_code);
 
			// Check for errrors
			if ($error_code != 0)
			{
				// Something is wrong but we don't know what
				$this->append($this->error("$command failed with an error code of $error_code"));
 
				return;
			}
			if (!file_exists($backup_path))
			{
				// The file that needs to be created cannot be
				$this->append($this->error("The path $backup_path, does not exist"));
 
				return;
			}
			if (sizeof($backup_path) == 0)
			{
				// The file was created but no data was written to it
				$this->append($this->error("The backup file was created but not filled. Try running the command $command from cmd."));
 
				return;
			}
 
		}
 
		header("Location: {$_SERVER['HTTP_REFERER']}");
	}
}
 
$db_dump = new dbDump();
?>

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