存在空格，因为您输入了空格；）

Space is there, because you entered it ;)

使用示例：

$var2 = "Name\Branch\\$var";
$var2 = "Name\Branch\\" . $var;
$var2 = 'Name\Branch\\' . $var;
$var2 = "Name\Branch\\{$var}";
$var2 = trim("Name\Branch\ ") . $var;