unregister_tick_function()

(PHP 4 >= 4.0.3, PHP 5, PHP 7)

De-register a function for execution on each tick

说明

unregister_tick_function(string $function_name): void

De-registers the function named by$function_nameso it is no longer executed when atickis called.

参数

$function_name: The function name, as a string.

返回值

没有返回值。

参见

register_tick_function()Register a function for execution on each tick

You can unregister closure-function:
declare(ticks = 1000);
$startTime = microtime(true);
$tick = true;
$closure = function () use ($startTime, &$tick) {
  if (((microtime(true) - $startTime) > 5) && $tick) {
    $tick = false;
    throw new \Exception('Time to run code left');
  }
};
try {
      register_tick_function($closure);
      //do your code
      $result = 1;
      return $result;
    } catch (\Exception $e) {
      throw $e;
    } finally {
      unregister_tick_function($closure);
}

It's not so clear, but, at least as of PHP 5.3.13, you cannot use this inside of the handler itself as it will throw an error:
<?php
declare(ticks=2);
function tick_handler()
{
  unregister_tick_function('tick_handler');
}
register_tick_function('tick_handler');
set_time_limit(0);
usleep(500000);
?>
results in:
warning: unregister_tick_function(): Unable to delete tick function executed at the moment in [filename]
So if you want to unregister it must be done outside of the handler.

Note that unregister_tick_function() can also accept a callback in the form of an array (either static, like array($className, $methodName) or instance, like array(&$this, $methodName)).
It cannot accept an anonymous function, however.