i need to validate a field in a form where a user enters a reference
number this can be letters, numbers and special characters also so i
have not written any special preg match as the username is a combination.
the only check i am doing is if there are any white spaces and if a
user simple presses the space bar and does not enter value i display a
message to enter the reference number and even if there are white
spaces followed by the reference number i have used trim method. i
have checked in the database even if there are white spaces followed
by reference number due to trim() method the data in the table is
being inserted whithout those white spaces.
following is the code i am presently using
$referencenumber = trim($_POST["referencenumber"]);
if(strlen($referencenumber) == 0)
{
$error.="<li>Reference number cannot be blank </li> <br />";
}
this code works perfectly fine and does what it is supposed to,
however i am using techniques to avoid sql injection. following is the
technique i have used
if(get_magic_quotes_gpc())
{
$username = stripslashes($_POST["username"]);
}
else
{
$username = $_POST["username"];
}
due to this even if i use
if(get_magic_quotes_gpc())
{
$lodgementnumber = stripslashes($_POST["lodgementnumber"]);
}
else
{
$lodgementnumber = trim($_POST["lodgementnumber"]);
}
if(strlen($lodgementnumber) == 0)
{
$error.="reference number cannot be blank;
}
the validation is not doing what it does in the code i mentioned at
the begining.
i need to use techniques to avoid sql injection and i also need the
validation to work.
how can i fix this.
please advice.
thanks.
