convert a string to integer

Hi,

i know this topic is obvious but i have a strange behavior and i'm getting
crazy.

my stored procedure returns me a string.
string can be an email or a message error => '-1', '-2', '-3'

when i check if the string contains only digit, i use ctype_digit(mystring)
but any way it returns me false... i suppose that for -1, -2, -3 the "-" is
taken as character and not a digit.
i tried also to cast it before into integer thanks
ctype_digit((int)mystring), but it does not work.

so how can i solve this issue ?

thx

--
Alain
------------------------------------
Windows XP SP2
PostgreSQL 8.2.4 / MS SQL server 2005
Apache 2.2.4
PHP 5.2.4
C# 2005-2008

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