HTMLIntField.php

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<?php

class HTMLIntField extends HTMLFloatField {
    function validate( $value, $alldata ) {
        $p = parent::validate( $value, $alldata );

        if ( $p !== true ) {
            return $p;
        }

        # http://dev.w3.org/html5/spec/common-microsyntaxes.html#signed-integers
        # with the addition that a leading '+' sign is ok. Note that leading zeros
        # are fine, and will be left in the input, which is useful for things like
        # phone numbers when you know that they are integers (the HTML5 type=tel
        # input does not require its value to be numeric).  If you want a tidier
        # value to, eg, save in the DB, clean it up with intval().
        if ( !preg_match( '/^((\+|\-)?\d+)?$/', trim( $value ) )
        ) {
            return $this->msg( 'htmlform-int-invalid' )->parseAsBlock();
        }

        return true;
    }
}