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

declare
unregister_tick_function() - 各 tick の実行用の関数の登録を解除する

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User Contributed Notes 2 notes

down

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());

?>

down

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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