<?php
// This source code is now part of the PHPLint project, see:
// http://cvs.icosaedro.it:8080/viewvc/public/phplint/stdlib/it/icosaedro/web
// Test code also available under the test/ directory of that project.
namespace it\icosaedro\web;
/*. require_module 'core'; require_module 'pcre'; .*/
/**
* Italian Partita IVA normalization, formatting and validation routines.
* A Partita IVA (PI) is composed of 11 digits; the last digit is the control
* code. Example: 12345678903.
* @author Umberto Salsi <salsi@icosaedro.it>
* @version $Date: 2020/01/23 10:35:47 $
*/
class PartitaIVA {
/**
* Normalizes a PI by removing white spaces.
* Useful to clean-up user's input and to save the result in the DB.
* @param string $pi Raw PI, possibly with spaces.
* @return string Normalized PI.
*/
static function normalize($pi)
{
$pi = (string) str_replace(" ", "", $pi);
$pi = (string) str_replace("\t", "", $pi);
$pi = (string) str_replace("\r", "", $pi);
$pi = (string) str_replace("\n", "", $pi);
return $pi;
}
/**
* Returns the formatted PI. Currently does nothing but normalization.
* @param string $pi Raw PI, possibly with spaces.
* @return string Formatted PI.
*/
static function format($pi)
{
return self::normalize($pi);
}
/**
* Verifies the basic syntax, length and control code of the given PI.
* @param string $pi Raw PI, possibly with spaces.
* @return string NULL if valid, or string describing why this PI must be
* rejected.
*/
static function validate($pi)
{
$pi = self::normalize($pi);
if( strlen($pi) == 0 )
return "Empty.";
else if( strlen($pi) != 11 )
return "Invalid length.";
if( preg_match("/^[0-9]{11}\$/sD", $pi) !== 1 )
return "Invalid characters.";
$s = 0;
for( $i = 0; $i < 11; $i++ ){
$n = ord($pi[$i]) - ord('0');
if( ($i & 1) == 1 ){
$n *= 2;
if( $n > 9 )
$n -= 9;
}
$s += $n;
}
if( $s % 10 != 0 )
return "Invalid checksum.";
return NULL;
}
}
Controllo del codice fiscale e della partita IVA