can you prevent a php while loop from erroring out? - php

Question

I was wondering if there was a way to prevent a while loop from prematurely erroring out or terminating. I've thrown a try/catch in there and it seems to keep terminating. (As to the cause why it's terminating, I'm still debugging).
$stomp = $this->stomp;
if(isset($queue) && strlen($queue) > 0) {
error_log('Starting Monitor for: '.$queue);
$stomp->subscribe($queue);
while(true) {
$frame = $stomp->readFrame();
if ($frame != null) {
// Callback must be an array: array('Class','Method);
if(is_array($callback) && count($callback) == 2) {
try {
$body = $frame->body;
$callFunct = call_user_func_array($callback,array($body,$arguments));
$stomp->ack($frame);
} catch(StompException $e) {
$msg = 'Stomp Monitor readFrame() Callback Fail: '.$e->getMessage();
$this->context->reportError('STOMP',array('errorDetails'=>$msg));
}
} else {
error_log('Invalid Stomp Callback');
}
}
}
} `
Thanks,
Steve

Answer 1

There's nothing to break out of the loop, so while(true) will carry on until it hits a timeout or some form of error condition. As a fallback, it's worth setting either a break to break out of the loop on condition, or use a while condition that you can set to false;
while (true) {
// do some things
break;
}
or
$x = true;
while ($x) {
// do some things
$x = false;
}
that way, exit from the loop is under your control
However, timeouts and other fatal errors still terminate the script as normal
If your code is breaking out of the while loop, you should be seeing some error, unless you have an error handler suppressing it