Re: Frustation with data validation
| From: | Joshua Moore-Oliva | Date: | Sun, 23 Feb 2003 21:59:11 +0000 |
| Subject: | Re: Frustation with data validation | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-136759@lists.php.net to get a copy of this message | ||
any $_POST data is actually string data. Use these functions from a class of
mine I plan on making public when I have it thoroughly tested.
function isString( $var_name, $var ) {
/*Nothing else I can do in this case.. I don't think any other data type
can have a length of zero.
If I jsut check for is_string and empty string will not register as a
string.*/
if ( strlen( $var ) == 0 ) {
return;
}
if ( !is_string( $var ) ) {
$this->{$this->log_func} ( "$var_name, '$var', does not contain valid
string data." );
}
}
function strIsInt( $str ) {
$this->isString( 'str', $str );
if ( strlen( $str ) == 0 ) {
return FALSE;
}
for ( $i = 0; $i < strlen($str); $i++ ) {
if ( !ctype_digit ( $str[$i] ) && $str[$i] != '-' ) {
return FALSE;
}
}
return TRUE;
}
On February 23, 2003 05:02 pm, Robert E. Harvey, M.D. wrote:
> First, thanks to all who offered suggestions with my "simple ereg
> question". I have been unable to get anything to work "properly" in
> spite of many good suggestions. The problem I want to solve is to
> ensure that input fields have either an integer number or are blank
> before the program proceeds. I am approaching the problem thusly:
>
> for ($i=1;$i<=3;$i++)
> {
> echo $_POST["grass_$i"]; // Pollen name
> echo $_POST["gamt_$i"]; // Pollen amount
> if (is_int($_POST["gamt_$i"]))
> {
> continue;
> }
> else
> {
> die("Non-numeric data entered in grass entry field(s).");
> }
> }
>
> The two echo statements accurately return what data is in the two input
> fields. The program dies when there is integer data returned in the
> echo $POST["gamt_$i"] statement.
>
> If I negate the expression in the if statement like so : if
> (!is_int($_POST["gamt_$i"]))
> the program runs. Isn't that a bit weird?
>
> It gets weirder. If I enter an alpha character with if
> (!is_int($_POST["gamt_$i"])), the program still runs but treats the
> alpha character as a 0.
>
> How should I construct that if statement so that the program will only
> run with integer data or no data entered into the input fields?
>
> TIA
>
> Bob Harvey