here is a simple example to use namespace
<?php
namespace app\a{
class one{
public static function _1(){
echo 'a one _1<br>';
}
}
}
namespace app\b{
class one{
public static function _2(){
echo 'b one _2<br>';
}
}
}
namespace app{
echo a\one::_1();
echo b\one::_2();
echo a\two::_1();
}
namespace app\a{
class two{
public static function _1(){
echo 'a two _1<br>';
}
}
}
prints
a one _1
b one _2
a two _1