The trait_exists Function
The trait_exists function checks if the specified trait exists in the current scope. The first parameter is the trait name as a string, the second (optional) is a flag indicating whether to use autoloading.
Syntax
trait_exists(string $traitname, bool $autoload = true): bool
Example
Check if a trait exists:
<?php
trait MyTrait {
public function sayHello() {
echo 'Hello';
}
}
$res = trait_exists('MyTrait');
var_dump($res);
?>
Code execution result:
true
Example
Check a non-existent trait with autoloading disabled:
<?php
$res = trait_exists('NonExistentTrait', false);
var_dump($res);
?>
Code execution result:
false
Example
Using the function in a conditional statement:
<?php
if (trait_exists('Loggable')) {
echo 'Trait exists';
} else {
echo 'Trait does not exist';
}
?>
Code execution result (if the trait is not declared):
'Trait does not exist'
See Also
-
the class_exists function,
which checks a class -
the interface_exists function,
which checks an interface -
the get_declared_traits function,
which returns traits -
the class_uses function,
which returns class traits
