register_tick_function

A working example with variable input for validating the asymptotic analysis of your algorithm:<?php$n = 1000; // Size of your inputdeclare(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());?>

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<?phpdeclare(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