synthesization.php

<?php

class Synthesization {

    private function signatureIsGetter($signature) {
        if (preg_match('/^get/', $signature))
            return true;
        return false;
    }

    private function signatureIsSetter($signature) {
        if (preg_match('/^set/', $signature))
            return true;
        return false;
    }

    private function getPropertyFromMethodSignature($signature) {
        return lcfirst(preg_replace('/^(g|s)et/', '', $signature));
    }

    public function __call($method, $params) {
        $property = $this->getPropertyFromMethodSignature($method);
        if (property_exists($this, $property)) {
            if ($this->signatureIsGetter($method))
                return $this->{$property};
            else if ($this->signatureIsSetter($method))
                return $this->{$property} = $params[0];
        }
        return false;
    }

}

synthesization_reflection.php

<?php

class Synthesization {

    private function signatureIsGetter($signature) {
        return preg_match('/^get/', $signature) ? true : false;
    }

    private function signatureIsSetter($signature) {
        return preg_match('/^set/', $signature) ? true : false;
    }

    private function getPropertyFromMethodSignature($signature) {
        return lcfirst(preg_replace('/^(g|s)et/', '', $signature));
    }

    public function __call($method, $params) {
        $property = $this->getPropertyFromMethodSignature($method);
        $reflector = new ReflectionClass(get_class($this));
        if ($reflector->hasProperty($property)) {
            $prop = $reflector->getProperty($property);
            $prop->setAccessible(true);
            if ($this->signatureIsGetter($method))
                return $prop->getValue($this);
            else if ($this->signatureIsSetter($method))
                return $prop->setValue($this, $params[0]);
            $prop->setAccessible(false);
        }
        return false;
    }

}

Example use case:

class MyClass extends Synthesization {

    protected $a;

    public function __construct() {
        $this->setA('hest');
    }

}

$mc = new MyClass();

echo $mc->getA();