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    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

    Descrizione

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

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

    Elenco dei parametri

    callback

    The function to register.

    args

    Valori restituiti

    Restituisce true in caso di successo, false in caso di fallimento.

    Esempi

    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);
    ?>

    Vedere anche:

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    User Contributed Notes 5 notes

    up
    4
    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
    up
    -10
    Jeremy
    17 years ago
    I tried the following on an IIS 6/PHP 5 machine:

    <?php
       
        set_time_limit    (0);
       
        function     profiler($return = false)
        {
            static     $m = 0;
            if(    $return) return $m . " bytes";
            if((    $mem = memory_get_usage()) > $m) $m = $mem;
        }
       
            register_tick_function('profiler');
        declare(    ticks = 1);
       
            $numbers = array();
        for(    $i=0; $i<1000000; $i++)
        {
            print(    $i . "<br />");
        }
       
        print(    profiler(true));
       
    ?>

    ...and got the following errors:

    1) PHP has encountered an Unhandled Exception Code -1073741674 at 0435EC5A
    2) PHP has encountered an Access Violation at 02727891
    3) PHP has encountered an Access Violation at 02727879
    4) PHP has encountered an Access Violation at 00000000

    So far the code hasn't crashed the web server, but like the warning says, "register_tick_function() should not be used with threaded web server modules. Ticks are not working in ZTS mode and may crash your web server."

    Strangely enough, the code does execute successfully every once in a while.
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    -13
    Ahmad Samiei
    11 years ago
    put in in your index to find where your code exited. find die o exit

    function shutdown_find_exit()
    {
    var_dump($GLOBALS['dbg_stack']);
    }
    register_shutdown_function('shutdown_find_exit');
    function write_dbg_stack()
    {
    $GLOBALS['dbg_stack'] = debug_backtrace();
    }
    register_tick_function('write_dbg_stack');
    declare(ticks=1);
    up
    -22
    rob dot eyre at gmail dot com
    13 years ago
    It looks like register_tick_function() can accept an anonymous function, but unregister_tick_function() cannot
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