register_tick_function

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

    register_tick_function — 各 tick で実行する関数を登録する

    説明

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

    tick がコールされた際に実行される callback という名前の関数を登録します。

    パラメータ

    callback

    登録する関数

    args

    戻り値

    成功した場合に true を、失敗した場合に false を返します。

    例

    例1 register_tick_function() の例

    <?php
    declare(ticks=1);

    // 関数をコールバックとして使用します
    register_tick_function('my_function', true);

    // オブジェクトのメソッドを使用します
    $object = new my_class();
    register_tick_function(array($object, 'my_method'), true);
    ?>

    参考

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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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