register_tick_function()

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

Register a function for execution on each tick

说明

Registers the given$functionto be executed when atickis called.

参数

The function name as a string, or an array consisting of an object and a method.

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

Example #1register_tick_function()example

更新日志

注释

register_tick_function()should not be used with threaded web server modules with PHP 5.2 or lower.

参见

• declare
• unregister_tick_function()De-register a function for execution on each tick

A working example with variable input for validating the asymptotic analysis of your algorithm: 

Due to an implementation bug, the declare(ticks=1) directive leaked into different compilation units prior to PHP 7.0. This is not how declare() directives, which are per-file or per-scope, are supposed to work.
Therefore there are different implementations between PHP 5.6 and the correct implementation has been added in PHP 7.0. This means the below script will return different results
#index.php

#inc.php

Running php index.php in the terminal gives:
  PHP 5.6 - 7
  PHP 7.0 - 5

I tried the following on an IIS 6/PHP 5 machine:

...and got the following errors:
1) PHP has encountered an Unhandled Exception Code -1073741674 at 0435EC5A
2) PHP has encountered an Access Violation at 02727891
3) PHP has encountered an Access Violation at 02727879
4) PHP has encountered an Access Violation at 00000000
So far the code hasn't crashed the web server, but like the warning says, "register_tick_function() should not be used with threaded web server modules. Ticks are not working in ZTS mode and may crash your web server."
Strangely enough, the code does execute successfully every once in a while.

put in in your index to find where your code exited. find die o exit
function shutdown_find_exit()
{
var_dump($GLOBALS['dbg_stack']);
}
register_shutdown_function('shutdown_find_exit');
function write_dbg_stack()
{
$GLOBALS['dbg_stack'] = debug_backtrace();
}
register_tick_function('write_dbg_stack');
declare(ticks=1);

It looks like register_tick_function() can accept an anonymous function, but unregister_tick_function() cannot

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