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

    Description

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

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

    Parameters

    callback

    The function to register.

    args

    Return Values

    Returns true on success or false on failure.

    Examples

    Example #1 register_tick_function() example

    <?php
    declare(ticks=1);

    // using a function as the callback
    register_tick_function('my_function', true);

    // using an object->method
    $object = new my_class();
    register_tick_function(array($object, 'my_method'), true);
    ?>

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    User Contributed Notes 2 notes

    up
    3
    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());

    ?>
    up
    0
    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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