register_tick_function

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

register_tick_function — Registra una función ejecutada en cada tick

Descripción

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

register_tick_function() registra la función callback para ser ejecutada cada vez que ocurre un tick.

Parámetros

callback: La función a registrar.
args

Valores devueltos

Esta función retorna true en caso de éxito o false si ocurre un error.

Ejemplos

Ejemplo #1 Ejemplo con register_tick_function()

<?php
declare(ticks=1);
function my_tick_function($param) {
 echo "Función de retorno tick llamada con el parámetro: $param\n";
}
register_tick_function('my_tick_function', true);
?>

Véase también

declare
unregister_tick_function() - Anula la función ejecutada en cada tick

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User Contributed Notes 2 notes

down

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());
?>

down

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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