What error message is commonly encountered when trying to set a function in a class variable in PHP?

When trying to set a function in a class variable in PHP, a common error message encountered is "Cannot use 'function' as a class constant". This error occurs because PHP does not allow functions to be assigned directly to class variables. To solve this issue, you can define the function separately and then assign it to the class variable. 

class MyClass {
    public $myFunction;

    public function myFunction() {
        // Function code here
    }

    public function __construct() {
        $this->myFunction = [$this, 'myFunction'];
    }
}

Keywords

error message function class variable PHP encountered

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