| PHP Newbie can't evaluate numerical string as number [message #175919] |
Mon, 07 November 2011 16:25  |
Graham
Messages: 4
Registered: November 2011
Karma:
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Junior Member |
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I'm a Perl veteran (well almost!) but a PHP newbie. I've got a simple
subtraction formula in 'vars.php' as follows:
<?php
$formula = "!big_number - !small_number";
?>
I then include it in 'test.php' along with a few variables, do a bit of
string replacement, run eval on it, then print it
<?PHP
include 'vars.php';
$big_number = 30000;
$small_number = 3000;
$formula = str_replace("!", "$", $formula);
eval("\$formula = \"$formula\";");
//$formula = intval($formula);
//settype($formula, "integer");
print ("formula = $formula\n");
?>
The above gives me...'formula = 30000 - 3000'
when of course what I want is...'formula = 27000'
A few of the many things I've tried are commented out. Please put me out of
my misery someone!
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