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

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    用户贡献的备注 2 notes

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    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());

    ?>
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    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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