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PHP Validate a string is a valid currency decimal

Posted on 2010-09-10
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Last Modified: 2012-05-10
Hi,

Given some user input I want to validate a string is an integer and convert this to a (foat,decimal) number to 2 d.p.

Input examples

7 ==> 7.00
70 ==> 70.00
70.3 ==> 70.30
70.35 ==> 70.35
40.995 ==> 41.00
40.994 ==> 40.99
70.54p ==> not valid
$70.00 ==> Not valid ($)
70GBP ==> Not valid (GBP)

Many thanks,




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Question by:bigMlittleC
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2 Comments
 
LVL 6

Assisted Solution

by:Mike D
Mike D earned 800 total points
ID: 33644566
Hi bigMlittleC,

I realize you're asking for PHP but since I found this under JS and my code should work similar in PHP here it is (I did this for a german customer hence the ',' [comma] and you would have to include a rounding function for 3 digits behind the decimal point scenario):

if(tot_price.indexOf(".") != -1) {
      fancy_tot_price = tot_price.substring(0, tot_price.indexOf(".")) + "," + tot_price.substring(tot_price.indexOf(".")+1, tot_price.length) + '0'      
}
else
      fancy_tot_price = tot_price + ',00'


Hope this helps!

greets
JD
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LVL 12

Accepted Solution

by:
Mohamed Abowarda earned 1200 total points
ID: 33644598
First, you have to use is_numeric function to insure that the input is a number, then you can use strpos function to check if the string contains dot "." so you can know if it's decimal or integer.

is_numeric:
http://php.net/manual/en/function.is-numeric.php

strrpos:
http://php.net/manual/en/function.strrpos.php
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