如何转义名称空间字符串

Question

New to namespace in php and trying to call a dummy class. Here is the code below

include "App/Controllers/Home.php";
// This code works but I commented it out to try it the otherway
//$home = new \App\Controllers\Home();

$namespace = "\App\Controllers\\";
$home = new  $namespace . Home();
$home->index();

It shows error

Fatal error: Uncaught Error: Class '\\App\\Controllers\\' not found in C:\\xampp\\htdocs\\namespace\\index.php:16 Stack trace: #0 {main} thrown in C:\\xampp\\htdocs\\namespace\\index.php on line 16

I believe I am not escaping the namespace right, can you help?

Answer 1

As misorude suggest you can try :

$namespace = "\\App\Controllers\\";
$classname = $namespace . 'Home';
$home = new  $classname();
$home->index();

Answer 2

You should prefer using single-quote for namespaces - using double quote may result some surprising effects since some sequences have special meaning if they're enclosed in double-quotes. With single-quotes you need to care only about trailing \\ since \\' will work as escaped ' and it will not be interpreted as end of the string:

$namespace = 'App\Controllers\\';

But this is unusual situation, usually you're using FQN, so there is no such problem:

$className = 'App\Controllers\Home';
$home = new $className();

Or just use ::class - this is more IDE and SCA firendly:

$className = \App\Controllers\Home::class;
$home = new $className();