trait_exists

(PHP 5 >= 5.4.0, PHP 7)

trait_existsChecks if the trait exists

Descrição

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

Parâmetros

traitname

Name of the trait to check

autoload

Whether to autoload if not already loaded.

Valor Retornado

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

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User Contributed Notes 2 notes

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8
Lubaev.K
2 years 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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0
valerio dot bozzolan at gmail dot com
16 days ago
What is the default value of $autoload? And in which way traits are autoloaded? Is there something as spl_autoload() for traits?
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