Numeric operation using string

Question

I have following string.

$option = '+';
$value = '100';

I want create new value using above parameters.

ex:- $newValue = 222 + 100;

How can i do it using above parameters? as following

$newValue = 222 $option $value;

(tip) "The Clean Code Talks -- Inheritance, Polymorphism, & Testing" — Gordon
– Gordon, Commented Oct 25, 2011 at 10:26

Val · Accepted Answer · 2011-10-25 10:25:57Z

10

function operate($a, $b, $opt){
    switch ($opt) {
        case '+':
            $ret = $a + $b;
            break;
        case '-':
            $ret = $a - $b;
            break;
        case '*':
            $ret = $a * $b;
            break;
        case '/':
            $ret = $a / $b;
            break;
        default:
            throw new Exception('Unsupported operation!');
    }
    return $ret;
}

Edit

$option = '+';
echo operate(222,100,$option);

edited Oct 25, 2011 at 10:25

Val

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answered Oct 25, 2011 at 10:19

xdazz

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2 Comments

Val Over a year ago

this is why ur answer is better and my answer is just being lazy :) and assuming user would get it, :) I have edited it a little for you how to call it but +1 for it :)

Val Over a year ago

I wish I could give you another +1 for the throw new Exception :)

Your Common Sense · Accepted Answer · 2011-10-25 10:18:10Z

5

$oldValue = 222;
switch ($option) {
  case '+':
  $newValue = $oldValue + $value;
  break;
}

answered Oct 25, 2011 at 10:18

Your Common Sense

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1 Comment

Sebastian Over a year ago

$newValue = $oldValue + $value;

Can Vural · Accepted Answer · 2011-10-25 10:20:45Z

4

<?php

$option = '+';
$value = '100';

eval("\$newValue=" . 222 . $option . $value . ';'); 
var_dump($newValue);

answered Oct 25, 2011 at 10:20

Can Vural

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2 Comments

Václav Novotný Over a year ago

This is very dangerous way!

Václav Novotný Over a year ago

If you call eval() function be sure you have in $option and $value variables only operators which you want to support and numbers.

Val · Accepted Answer · 2011-10-25 10:18:25Z

4

switch($option){
 case '+':
    $newValue =  222 + $value;
  break;

}


echo $newValue;

hope it helps

answered Oct 25, 2011 at 10:18

Val

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