"how to make php libraries loosely coupled? [closed]" Code Answer

loose coupling normally means that your components do not expect a concrete instance but just one instance that has a compatible interface.

each collaborator can be replaced then with a different one of the same type. the code is not dependent on a concrete implementation of one of those any longer.

so:

do not use:

global (static) functions
```
foo:bar();
```
class based programming (passing a classname around)
```
stream_wrapper_register("var", "variablestream");
```

global constants

if ( !defined('abspath') )   
    define('abspath', dirname(__file__) . '/');

but:

use objects
```
$foo->bar();
```

program against interfaces

public function __construct(loggerinterface $logger) {

unit-test with mocks

$logger = $this->getmock('loggerinterface', array('log'));

see as well:

don't be stupid: grasp solid! (dec 2011; by nikic)

By Rohit_D on March 1 2022

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