Trait to dynamically bind methods to a class.

bind_methods.php

<?php

trait BindMethods
{
    private $boundMethods = [];

    public function bindMethod($methodName, $method) {
        $this->boundMethods[$methodName] = Closure::bind($method, $this, get_class());
    }

    function __call($method, $args) {
        if (is_callable('parent::__call')) {
            parent::__call($method, $args);
        }

        if(is_callable($this->boundMethods[$method]))
        {
            return call_user_func_array($this->boundMethods[$method], $args);
        }
    }
}

Example usage:

class ExampleClass
{
    use BindMethods;

    public function __construct($example)
    {
        $this->example = $example;
    }
}

$a = new ExampleClass('This is an');

$a->bindMethod('test', function() {
    return "{$this->example} example of using the trait.";
});

echo $a->test(); // Returns "This is an example of using the trait."