(PHP 5 >= 5.4.0, PHP 7)
trait_exists — Checks if the trait exists
trait_exists ( string $traitname [, bool $autoload ] ) : bool
traitname
Name of the trait to check
autoload
Whether to autoload if not already loaded.
Returns true if trait exists, false if not, null in case of an error.
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https://www.php.net/manual/en/function.trait-exists.php