register_tick_function

(PHP 4 >= 4.0.3, PHP 5, PHP 7, PHP 8)

register_tick_function — Register a function for execution on each tick

Beschreibung

function register_tick_function(callable $callback, mixed ...$args): bool

Registers the given callback to be executed when a tick is called.

Parameter-Liste

callback

The function to register.

args

Rückgabewerte

Gibt bei Erfolg true zurück. Bei einem Fehler wird false zurückgegeben.

Changelog

Version Beschreibung
8.5.0 Tick handlers are now deactivated later during request shutdown: after all shutdown functions and destructors have run, and after the output handlers have been cleaned up. Previously they were deactivated at the very beginning of request shutdown, so tick functions were no longer called during shutdown functions, destructors, or output handling. See the migration guide for details.

Beispiele

Beispiel #1 register_tick_function() example

<?php
declare(ticks=1);

function my_tick_function($param) {
    echo "Tick callback function called with param: $param\n";
}

register_tick_function('my_tick_function', true);
?>

Siehe auch

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User Contributed Notes 2 notes

up
3
Carlos Granados
9 years ago
A working example with variable input for validating the asymptotic analysis of your algorithm:

<?php

$n = 1000; // Size of your input

declare(ticks=1);

class Counter {
    private $counter = 0;

    public function increase()
    {
        $this->counter++;
    }
    
    public function print()
    {
        return $this->counter;    
    }
}

$obj = new Counter;

register_tick_function([&$obj, 'increase'], true);

for ($i = 0; $i < 100; $i++)
{
    $a = 3;
}

// unregister_tick_function([&$obj, 'increase']);
// Not sure how to de-register, you can use static methods and members in the Counter instead.

var_dump("Number of basic low level operations: " . $obj->print());

?>
up
1
Peter Featherstone
9 years ago
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

<?php

declare(ticks=1);
$count = 0;

register_tick_function('ticker');
function ticker() {
  global $count;
  $count++;
}

?>

#inc.php

<?php

$baz = "baz";
$qux = "qux";

?>

Running php index.php in the terminal gives:

    PHP 5.6 - 7
    PHP 7.0 - 5
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