Description:
------------
On Ubuntu installed php7.1.9 (PHP Version 7.1.9-1+ubuntu14.04.1+deb.sury.org+1) no special configuration. Have one file and request to that file not return result, apache version is Apache/2.4.7 (Ubuntu). If I chnage anything  in code it work properly. If disable opcode than it work fine.



Test script:
---------------
<?php

class PlanService
{


    public function generatePlanImage()
    {
        if ($abc > 5) {
            $abc = 5;
        }

        for ($row = 0; $row < $abc; $row++) {

            for ($col = 0; $col < $numCols; $col++) {

                $this->getPossibleRatio( $abc);

            }
        }

    }

    public function getPossibleRatio( $abc)
    {
    }

}
var_dump('worked');exit;

Expected result:
----------------
expected to get response

Actual result:
--------------
apache not return any result,CPU is going to 99% and  request hangs.