PHP namespace examples illustrate _php tips

Copy Code code as follows:

namespace Bak\ba\ba;
Function Bab () {
echo "BI";
}
namespace KKK;
function K1 () {
echo "K1";
}
\bak\ba\ba\bab ();//Use a different namespace under the KKK namespace, note the previous \
Use \bak\ba\ba as b;//is still under the KKK namespace, but the following methods are correct when using aliases
#use Bak\ba\ba as b;//can not use the \ number before
B\bab ()//The name of the namespace under the alias is not preceded by a number
K1 ()//Call this function without an error, stating that use does not affect the current namespace