register_tick_function

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

register_tick_function — Enregistre une fonction exécutée à chaque tick

Description

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

register_tick_function() enregistre la fonction callback pour être exécutée à chaque fois qu'un tick survient.

Liste de paramètres

callback: La fonction à enregistrer.
args

Valeurs de retour

Cette fonction retourne true en cas de succès ou false si une erreur survient.

Exemples

Exemple #1 Exemple avec register_tick_function()

<?php
declare(ticks=1);

// Utilisation d'une fonction de callback
register_tick_function('my_function', true);

// Utilisation d'une méthode d'objet
$object = new my_class();
register_tick_function(array($object, 'my_method'), true);
?>

Voir aussi

declare
unregister_tick_function() - Annule la fonction exécutée à chaque tick

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User Contributed Notes 2 notes

down

Carlos Granados ¶

7 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());

?>

down

Peter Featherstone ¶

7 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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