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

    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

    Devuelve true en caso de éxito o false en caso de error.

    Ejemplos

    Ejemplo #1 Ejemplo con register_tick_function()

    <?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
    2
    Carlos Granados
    8 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
    0
    Peter Featherstone
    8 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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