Introduction
More than one namespaces can be defined in a single file with .php extension. There are two diferent methods prescribed for the purpose. combination syntax and bracketed syntax
Multiple Namespaces with Combination Syntax
In this example two namespaces are defined one below the other. Resources in first namespace are available till second definition begins. If you want to make a namespace as current load it with use keyword.
Example
<?php
namespace myspace1;
function hello() {
echo "Hello World from space1\n";
}
echo "myspace1 : ";
hello();
namespace myspace\space2;
function hello(){
echo "Hello World from space2\n";
}
echo "myspace2 : ";
hello();
use myspace1;
hello();
use myspace2;
hello();
?>Output
Above code shows following output
myspace1 : Hello World from space1 myspace2 : Hello World from space2 Hello World from space2 Hello World from space2
Multiple Namespaces with bracketed Syntax
In following example two namespaces are defined with their scope marked by curly brackets
Example
<?php
namespace myspace1{
function hello() {
echo "Hello World from space1\n";
}
echo "myspace1 : ";
hello();
}
namespace myspace\space2{
function hello(){
echo "Hello World from space2\n";
}
echo "myspace2 : ";
hello();
}
?>Output
Above code shows following output
myspace1 : Hello World from space1 myspace2 : Hello World from space2
Bracketed syntax for multiple namespaces is recommended over combined syntax. Bracketed and unbracketed namespaces can not be mixed. Except for an opening declare statement, no other PHP code may exist outside of the namespace brackets. If you have to combone global namespace with named namespace, only bracketed syntax is allowed.