Piotr Zaniewicz » Web

Fractions in PHP and whole numbers

Piotr Zaniewicz — Tue, 20 Apr 2010 16:52:38 +0000

I have been searching for a good PHP class for fraction handling and found Math_Fraction in the PEAR database.
However, it was still lacking a possibility to display the whole numbers of a fraction and I had to rewrite the last function in the Fraction.php file.
Here it is:

function toString($whole=false)
{
    $n = $this->getNum();
    $d = $this->getDen();
    if (($whole == false) || ($n<$d)) {
        return "$n/$d";
    }
    else {
        if ($n==$d || $d==1) {
            return floatval($n / $d);
        }
        else {
            $w = floor($n/$d);
            $n = ($n-($d*$w));
            return "$w $n/$d";
        }
    }
 
}

I have also informed the maintainer about it, so he might update it some time.
Meanwhile I invite you to use this simple, yet effective solution.

php strpos array

Piotr Zaniewicz — Thu, 26 Mar 2009 05:57:20 +0000

I needed a PHP function to check whether a string contained one of the array values. As we know strpos does’t accept input as an array so I had to tweak it bit. Below is an example of what I did:

function strpos_array($string, $values) {
    $hits = 0; //will give number of values found in a string
    foreach ($values as $try) {
        $pos = strpos($string, $try);
        if ($pos !== false){
            $hits++; // you can do array_push here to get the values
        }
    }
    if ($hits==0) { //if none value from array was found returns false
        return false;
    }
    else { //I just needed a simple true/false boolean
       return true;
    }
}

FPDF polskie wolne czcionki

Piotr Zaniewicz — Mon, 19 Jan 2009 11:13:26 +0000

Postanowiłem wreszcie trochę uporządkować czcionki używane do generowania dokumentów pdf oraz obrazków wykorzystujących czcionki ttf. Załączam zestaw gotowej do zainstalowania czytelnej czcionki z pakietu liberation-fonts. Które są upowszechnione na licencji GPL.

Pobierz

Suhosin and maximum $_POST variables limit

Piotr Zaniewicz — Wed, 23 Apr 2008 21:30:54 +0000

I had a problem of more than 200 $_POST variables in one of my php scripts. Something was limiting the script not to process more than 200 in the $_POST array.

After unsuccessfully trying to find some info about how to change it in php.ini or apache.conf I found a solution using Suhosin:

You simply add the following to your php.ini file after loading the suhosin module:

[suhosin]
suhosin.post.max_vars = 2000
suhosin.request.max_vars = 2000

That’s easy now

Update: remember to restart Apache after making these changes.

Suhosin – customize php security

Piotr Zaniewicz — Wed, 09 Apr 2008 19:46:37 +0000

I was trying to configure my virtualhosts to have different php options regarding shell access. After some research I came up with Suhosin solution, which solved problems with setting disable_functions per virtualhost. Look it up!

A php function to return random values

Piotr Zaniewicz — Sat, 22 Sep 2007 09:24:14 +0000

I was looking for a method in php that would return unequal numbers using the rand() function. I found an answer on php.net and all credit goes to alishahnovin at hotmail dot com. The method is as follows:

function randiff($min, $max, $num) {
    if ($min<$max && $max-$min+1 >= $num && $num>0) {
        $random_nums = array();
        $i=0;
        while($i<$num) {
            $rand_num = rand($min, $max);
            if (!in_array($rand_num, $random_nums)) {
                $random_nums[] = $rand_num;
                $i++;
            }
        }
        return $random_nums;
    } else {
        return false;
    }
}

Usage:

$nums = randiff(0,10,2);
$var1 = $nums[0];
$var2 = $nums[1];