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

Descrizione

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

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

Elenco dei parametri

callback

The function to register.

args

Valori restituiti

Restituisce true in caso di successo, false in caso di fallimento.

Esempi

Example #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);
?>

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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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