set_time_limit does not work

Question

I have a bigint class in php, to calculate big numbers. It works well, except the time limit.

I set the time limit with

set_time_limit(900);

in my bigint.php file, and it works in localhost. But in my web host, when I try to calculate 999^999, it yields the error

Fatal error: Maximum execution time of 10 seconds exceeded in /home/vhosts/mysite.com/http/bigint/bigint.php on line 156

This is my code:

public function Multiply_Digit($digit){ //class function of bigint
if($digit==0){$this->str="0";}
else
{
$len=$this->length();
$Result = new bigint("0");
                $carry=0;
                $current;
/*line 156:*/   for ($i = 0; $i < $len; $i++)
                {
                    $current = $this->str[$len-$i-1] * $digit;                    
                    if ($i == 0) { $Result->str = ""+(($current + $carry) % 10); }
                    else{ $Result->str .= ""+(($current + $carry) % 10); }                                        
                    $carry = (($current+$carry) - ($current+$carry)%10)/10;
                }
                $Result->str .= ""+$carry;                
                $Result->str = strrev($Result->str);
                $Result->TrimLeadingZeros();                
                $this->str = $Result->str;//sacma oldu.
                }//else. digit not zero
}//Multiply_Digit()

I tried putting set_time_limit(900); in both starting of php file and the constructor of class, none worked.

I thought it was a session issue, closed my browser and re-opened the page, still it takes 10 seconds as time limit.

What am I doing wrong here?

Answer 1

"This function has no effect when PHP is running in safe mode. There is no workaround other than turning off safe mode or changing the time limit in the php.ini." - http://php.net/manual/en/function.set-time-limit.php

Check it.