Traits in php

Traits in php provide a mechanism for reusing code outside of a class hierarchy. Traits allow you to share functionality across different classes that don’t (and shouldn’t) share a common ancestor in a class hierarchy.

trait traitname [ extends baseclass ]
{
[ use traitname, [ traitname, … ]; ]
[ visibility $property [ = value ]; … ]
[ function functionname (args) {
// code
}
…
]
}

To declare that a class should include a trait’s methods, include the use keyword and any number of traits, separated by commas:

trait Logger
{
 public log($logString)
 {
 $className = __CLASS__;
 echo date("Y-m-d h:i:s", time()) . ": [{$className}] {$logString}";
 }
}
class User
{
 use Logger;
 public $name;
 function __construct($name = '')
 {
 $this->name = $name;
 $this->log("Created user '{$this->name}'");
 }
 function __toString()
 {
 return $this->name;
 }
}
class UserGroup
{
 use Logger;
 public $users = array();
 public addUser(User $user)
 {
 if (!$this->includesUser($user)) {
 $this->users[] = $user;
 $this->log("Added user '{$user}' to group");
 }
 }
}

$group = new UserGroup;
$group->addUser(new User(“Franklin”));
2012-03-09 07:12:58: [User] Created user ‘Franklin’
2012-03-09 07:12:58: [UserGroup] Added user ‘Franklin’ to group