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Re: PHP Newbie can't evaluate numerical string as number

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Graham wrote:

> I'm a Perl veteran (well almost!) but a PHP newbie. […]
> <?php
> $formula = "!big_number - !small_number";
> ?>
> […]
> $big_number = 30000;
> $small_number = 3000;
> $formula = str_replace("!", "$", $formula);
> eval("\$formula = \"$formula\";");

You don't want a string, so don't make a string – remove the `\"'.
(I don't think Perl is so much different in that regard.)

> […]
> The above gives me...'formula = 30000 - 3000'
> when of course what I want is...'formula = 27000'

HTH

PointedEars
-- 
When all you know is jQuery, every problem looks $olvable.

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PHP Newbie can't evaluate numerical string as number "Graham" <graham.stow@stowassocs.co.uk> - 2011-11-07 16:25 +0000
  Re: PHP Newbie can't evaluate numerical string as number The Natural Philosopher <tnp@invalid.invalid> - 2011-11-07 16:56 +0000
  Re: PHP Newbie can't evaluate numerical string as number Denis McMahon <denismfmcmahon@gmail.com> - 2011-11-07 17:52 +0000
    Re: PHP Newbie can't evaluate numerical string as number "Graham" <graham.stow@stowassocs.co.uk> - 2011-11-08 08:41 +0000
      Re: PHP Newbie can't evaluate numerical string as number Erwin Moller <Since_humans_read_this_I_am_spammed_too_much@spamyourself.com> - 2011-11-08 09:56 +0100
        Re: PHP Newbie can't evaluate numerical string as number "Graham" <graham.stow@stowassocs.co.uk> - 2011-11-08 09:35 +0000
          Re: PHP Newbie can't evaluate numerical string as number Denis McMahon <denismfmcmahon@gmail.com> - 2011-11-08 09:57 +0000
            Re: PHP Newbie can't evaluate numerical string as number Tim Streater <timstreater@greenbee.net> - 2011-11-08 10:08 +0000
              Re: PHP Newbie can't evaluate numerical string as number Denis McMahon <denismfmcmahon@gmail.com> - 2011-11-08 17:49 +0000
            Re: PHP Newbie can't evaluate numerical string as number "Graham" <graham.stow@stowassocs.co.uk> - 2011-11-08 10:27 +0000
  Re: PHP Newbie can't evaluate numerical string as number Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2011-11-07 23:49 +0100
  Re: PHP Newbie can't evaluate numerical string as number Jonathan Stein <jstein@image.dk> - 2011-11-08 11:19 +0100

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