PHP Namespaces
Namespaces are qualifiers that help solve two different problems:
They help keep things more organized by putting together classes that work together to do a task.
They let more than one class share the same name.
For example, you might have a set of classes that describe an Test table, like Table, Row, and Cell, and another set of classes that describe furniture, like Table, Chair, and Bed. Namespaces can be used to separate the classes into two groups and keep the Table and Table classes from getting mixed up.
Declaring a Namespace
The namespace keyword is used to declare a namespace at the beginning of a file.
Syntax
Declare a namespace called Test:
<?php
namespace Test;
?>
Note: The first thing in a PHP file must be a namespace declaration. The following code is not correct:
<?php
echo “Welcome to Coderazaa!”;
namespace Test;
…
?>
Example
<?php
namespace Test;
class One {
public $a = “”;
public $rows= 0;
public function message() {
echo “<p>Database ‘{$this->a}’ has {$this->rows} tables.</p>”;
}
}
$data = new One();
$data->a = “My DB”;
$data->rows= 11;
?><!DOCTYPE html>
<html>
<body><?php
$data->message();
?></body>
</html>
Output
Database ‘My DB’ has 11 tables.