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Re: PHP Newbie can't evaluate numerical string as number [message #175922 is a reply to message #175919] Mon, 07 November 2011 22:49 Go to previous messageGo to previous message
Thomas 'PointedEars'  is currently offline  Thomas 'PointedEars'
Messages: 701
Registered: October 2010
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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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