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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.
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