multiplay a string of character by an integer

Question

I need to display a fraction in PHP. For that I wrote:

$a = 3;

$b = 2;

$c = "$a/$b";

echo $c; // this displays 3/2 but on the other hand I want to multiply $c by an integer;

echo $c * 2; // this shows me an error

this is what shows me : ( ! ) Notice: A non well formed numeric value encountered

Can someone help me please?

AlainIb · Accepted Answer · 2020-05-07T09:58:52.927

remove the double quote around operations ($a/$b) because it mean it is a string not an integer or float
```
$a = 3;
$b = 2;
$c = $a/$b; 
echo $c * 2;
```
to display fraction it is another story

maybe look at this PHP convert decimal into fraction and back?

or use this function

function decimalToFraction($decimal){

    if ($decimal < 0 || !is_numeric($decimal)) {
        // Negative digits need to be passed in as positive numbers
        // and prefixed as negative once the response is imploded.
        return false;
    }
    if ($decimal == 0) {
        return [0, 0];
    }

    $tolerance = 1.e-4;

    $numerator = 1;
    $h2 = 0;
    $denominator = 0;
    $k2 = 1;
    $b = 1 / $decimal;
    do {
        $b = 1 / $b;
        $a = floor($b);
        $aux = $numerator;
        $numerator = $a * $numerator + $h2;
        $h2 = $aux;
        $aux = $denominator;
        $denominator = $a * $denominator + $k2;
        $k2 = $aux;
        $b = $b - $a;
    } while (abs($decimal - $numerator / $denominator) > $decimal * $tolerance);

    return [
        $numerator,
        $denominator
    ];
}

source https://www.designedbyaturtle.co.uk/converting-a-decimal-to-a-fraction-in-php/

multiplay a string of character by an integer

1 Answers1