register_tick_function

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

register_tick_function — 注册一个函数以便在每个 tick 上执行

说明

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

注册给定的 callback，以便在 tick 被调用时执行。

参数

callback: 需要注册的函数。
args

返回值

成功时返回 true，或者在失败时返回 false。

示例

示例 #1 register_tick_function() 示例

<?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);
?>

参见

declare
unregister_tick_function() - 注销每个 tick 上需要执行的函数

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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());

?>

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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