Is it bad practice to declare a class's ctor 'final' in PHP?

[mfi]

If I have a parent class that is extended by lots and lots of other classes, and I want to make sure the parent class's constructor is ALWAYS run, is it a bad idea to declare the constructor \[code\]final\[/code\]?I was thinking of doing something like this:\[code\]class ParentClass { public final function __construct() { //parent class initialization... $this->construct(); } protected function init() { echo 'constructing<br>'; }}class ChildClass extends ParentClass { protected function init() { //child class initialization echo 'constructing child<br>'; }}\[/code\]that way the child class can have a sort-of constructor, and the parent class's constructor will always execute. Is this bad practice?