Trait Singleton and invocation examples in PHP

Trait single case

Examples are as follows

<?phptrait Singleton {/** * private construct, generally defined by us ing class *///private function construct () {} public static function getinstance () {static $_instan        CE = NULL;        $class = class;    Return $_instance?: $_instance = new $class; Public Function Clone () {trigger_error (' cloning ').    CLASS. ' is not allowed. ', e_user_error); The Public Function wakeup () {trigger_error (' unserializing ').    CLASS. ' is not allowed. ', e_user_error);        }}/*** Example usage*/class foo {use singleton;    Private Function construct () {$this->name = ' foo ';        }}class Bar {use singleton;    Private Function construct () {$this->name = ' bar '; }} $foo = Foo::getinstance (), echo $foo->name; $bar = Bar::getinstance (); Echo $bar->name; 

Calling the Trait method

Although not obvious, if the trait method can be defined as a static method in a normal class, it can be called

Examples are as follows

<?php trait Foo {     function bar () {         return ' Baz ';     }} Echo Foo::bar (), "\\n";?>

Class and trait

Class returns the class name,trait of Use trait returns trait name

Examples such as the following

<?phptrait testtrait {public Function TestMethod () {echo "Class:". CLASS.        Php_eol; echo "Trait:". TRAIT.    Php_eol; }}class BaseClass {use testtrait;} Class TestClass extends BaseClass {} $t = new TestClass (); $t->testmethod ();//class:baseclass//trait:testtrait