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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

Thomas 'PointedEars'
Messages: 701
Registered: October 2010

Karma:

Senior Member

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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[Message index]

		PHP Newbie can't evaluate numerical string as number By: Graham on Mon, 07 November 2011 16:25
		Re: PHP Newbie can't evaluate numerical string as number By: The Natural Philosoph on Mon, 07 November 2011 16:56
		Re: PHP Newbie can't evaluate numerical string as number By: Denis McMahon on Mon, 07 November 2011 17:52
		Re: PHP Newbie can't evaluate numerical string as number By: Graham on Tue, 08 November 2011 08:41
		Re: PHP Newbie can't evaluate numerical string as number By: Erwin Moller on Tue, 08 November 2011 08:56
		Re: PHP Newbie can't evaluate numerical string as number By: Graham on Tue, 08 November 2011 09:35
		Re: PHP Newbie can't evaluate numerical string as number By: Denis McMahon on Tue, 08 November 2011 09:57
		Re: PHP Newbie can't evaluate numerical string as number By: Tim Streater on Tue, 08 November 2011 10:08
		Re: PHP Newbie can't evaluate numerical string as number By: Denis McMahon on Tue, 08 November 2011 17:49
		Re: PHP Newbie can't evaluate numerical string as number By: Graham on Tue, 08 November 2011 10:27
		Re: PHP Newbie can't evaluate numerical string as number By: Thomas 'PointedEars' on Mon, 07 November 2011 22:49
		Re: PHP Newbie can't evaluate numerical string as number By: Jonathan Stein on Tue, 08 November 2011 10:19

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