PHP check trait exists before use it

Question

class Bar {

     //use Foo;
     if ( trait_exists('foo') ) { use \Foo; }

     public function .......
}

I need to check trait exists before "use" it, but i got error. Is anyone know how to achieve this?

Tatsh · Accepted Answer · 2018-08-29 06:49:58Z

1

Only define the class if the trait exists:

if (trait_exists('Foo')) {
    class Bar {
        use \Foo;
    }
} else {
    // define alternative Bar class or throw error
}

answered Aug 29, 2018 at 6:49

Tatsh

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2 Comments

Benjamin W Over a year ago

Bar class still got some other works need to do, it must define

Tatsh Over a year ago

You cannot do that due to the way PHP defines classes. You could dynamically create a class at runtime: if (trait_exists('Foo')) { $bar = new class { use \Foo; /* ... */ }; }. You probably should restructure your code. Traits are probably not the solution to your issue.

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