Do I need to escape backslash in PHP?

echo 'Application\Models\User'; # Prints "Application\Models\User"
echo 'Application\\Models\\User'; # Same output
echo 'Application\Model\'User'; # Gives "Application\Model'User"

So it's an escape character. Shouldn't I need to escape it (\) if I want to refer to Application\Models\User?

php string escaping
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