<?php
trait World {
private static $instance;
protected $tmp;
public static function World()
{
self::$instance = new static();
self::$instance->tmp = get_called_class().' '.__TRAIT__;
return self::$instance;
}
}
if ( trait_exists( 'World' ) ) {
class Hello {
use World;
public function text( $str )
{
return $this->tmp.$str;
}
}
}
echo Hello::World()->text('!!!'); // Hello World!!!
trait_exists
(PHP 5 >= 5.4.0, PHP 7, PHP 8)
trait_exists — Vérifie si un trait existe
Description
trait_exists(string
$trait, bool $autoload = true): bool
Liste de paramètres
-
trait -
Nom du trait à vérifier
-
autoload -
trues'il faut charger le trait dans le cas où ce n'est pas encore fait.
Valeurs de retour
Retourne true si le trait existe, false s'il n'existe pas, null en cas d'erreur.
add a note
User Contributed Notes 3 notes
Lubaev.K ¶
10 years ago
astinus dot eberhard at gmail dot com ¶
7 years ago
Traits are compatible with class autoload mechanism - in fact, if you look at source code of trait_exists function, you will find similar peace of code (see Zend/zend_builtin_functions.c)
valerio dot bozzolan at gmail dot com ¶
8 years ago
What is the default value of $autoload? And in which way traits are autoloaded? Is there something as spl_autoload() for traits?
