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I recently had trouble with this as I was trying to handle destruction specifically for the case where the server experiences a timeout and I wanted to include class data in the error log. I would receive an error when referencing &$this (although I've seen it done in a few examples, possibly a version issue or a symfony side-effect), and the solution I came up with was fairly clean:
class MyClass
{
protected $myVar;
/**
* constructor, registers shutdown handling
*/
public function __construct()
{
$this->myVar = array();
// workaround: set $self because $this fails
$self = $this;
// register for error logging in case of timeout
$shutdown = function () use (&$self) {
$self->shutdown();
};
register_shutdown_function($shutdown);
}
/**
* handle shutdown events
*/
public function shutdown()
{
$error = error_get_last();
// if shutdown in error
if ($error['type'] === E_ERROR) {
// write contents to error log
error_log('MyClass->myVar on shutdown' . json_encode($this->myVar), 0);
}
}
...
Hope this helps!
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