Sum Value from a Text String

Question

I have clients you enter bedrooms as 1 + 2 instead of entering the overall total which in this case would be 3. There is method in PHP that will allow me to take a simple string and generate the sum value?

$bedrooms = '1 + 2';

Why not cleanup the validation? So that clients DON'T enter 1+3? Might be the cleaner way to go, as you might open yourself up to something like 1m + 3child, etc; — Jakub, Feb 29 '12 at 18:43
What if I enter '2 & maybe a 3rd'? Require a number, have a comment/textfield for further instructions. — Wrikken, Feb 29 '12 at 18:53
I have to leave it this way as 1 + 2 means one bedroom on main floor and two bedrooms on second floor and this how they like it displayed. Now I am getting into mirroring listings for my clients and the providers I am mirror to do not want it this way. I leave as is and try the answers below. Thanks for the suggestions. — Tim, Feb 29 '12 at 19:02
display and input are not the same thing, get discrete usable input, then format the display any way you like. — , Feb 29 '12 at 19:04

score 3 · Accepted Answer · answered Feb 29 '12 at 18:43

3

You could do something like this:

$bedrooms = array_sum(explode("+", str_replace(" ", "", "1 + 2")));

answered Feb 29 '12 at 18:43

Travesty3

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Oh my you are more savoir. That worked out perfectly. Thank you. – Tim Feb 29 '12 at 19:05

score 2 · Answer 2 · answered Feb 29 '12 at 18:42

2

Look up eval - That should do the trick.

But ensure that you have a good regular expression to ensure that the input will not do any harm

e.g. `^[1-9]+ *(+ [1-9]+)$'

answered Feb 29 '12 at 18:42

Ed Heal

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@T - Knowing the vulnerabilities and still being able to use it safely isn't ;) +1 For the sanitation regex Ed! – Lix Feb 29 '12 at 18:47
Weird thing that eval in Perl makes code safer - it implements exceptions! – Ed Heal Feb 29 '12 at 18:51

score 1 · Answer 3 · answered Feb 29 '12 at 18:43

1

parse that string by + into array add the values

answered Feb 29 '12 at 18:43

Har

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score 0 · Answer 4 · answered Mar 01 '12 at 09:56

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try this

    $bedrooms = 1 + 2;
    $pattern = '/([a-zA-Z \+\-])+/';
    $replacement = '+';
    echo array_sum(explode('+', preg_replace($pattern, $replacement, $bedrooms)));

just to make sure some characters are in the input string

answered Mar 01 '12 at 09:56

Junaid

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Sum Value from a Text String

4 Answers4