[Plugin: Contact Form 7] Filter Form Values

I have a form with a text field for entering phone numbers, and need to strip out any non-numeric characters before using a number in an email address for an SMS gateway:

[email protected]

That would send a text message to 123-123-1234, on TMobile. Most SMS gateways won’t allow any dashes, so I need to remove them.

I tried to do this by adding a filter function to ‘wpcf7_validate_text’. That looks like it works in the browser (and it can validate the number just fine,) but in the mail logs I see that the email is still being sent with the dashes in the number. I would like to avoid relying on Javascript if possible, because if something goes wrong with the JS then the form would be effectively broken.

I would be grateful for any help. Here’s the filter function I’m currently using:


function is_phone( $result, $tag ) { // Validate phone numbers
$type = $tag['type'];
$name = $tag['name'];

if( $name == 'phone' ) {
$stripped = preg_replace( '/\D/', '', $_POST[$name] );
$_POST[$name] = $stripped;
if( strlen( $_POST[$name] ) != 10 ) {
$result['valid'] = false;
$result['reason'][$name] = $_POST[$name] /*'You must enter a 10 digit U.S. phone number.'*/;
}
}
return $result;
}
add_filter( 'wpcf7_validate_text', 'is_phone', 10, 2 );
add_filter( 'wpcf7_validate_text*', 'is_phone', 10, 2 );