trait_exists

(PHP 5 >= 5.4.0)

trait_existsChecks if the trait exists

Descrizione

bool trait_exists ( string $traitname [, bool $autoload ] )

Elenco dei parametri

traitname

Name of the trait to check

autoload

Whether to autoload if not already loaded.

Valori restituiti

Returns TRUE if trait exists, FALSE if not, NULL in case of an error.

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User Contributed Notes 1 note

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2
Lubaev.K
10 months ago
<?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!!!
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