Having run into this issue myself, I created a Latin-9 compatible
validation function for alphanumeric data. Our system is not using
Unicode, so you need to be using Latin-9 (ISO-8859-15) for your
CakePHP installation and database. I assume the approach could be
adapted to UTF-8 quite easily.
I chose to use a function to generate the characters I need for the
regexp, as keeping the actual code ASCII makes it immune to encoding
issues. I decided to keep my "magic string" as a global constant, but
encapsulating it into the validation function would work as well.
=== Put in bootstrap.php -- STARTS ===
// Special non-ascii characters for encoding-proof usage.
global $LATIN_9_EXTCHARS;
$LATIN_9_EXTCHARS = array(
166, // S with caron (hachek)
168, // s with caron (hachek)
180, // Z with caron (hachek)
184, // z with caron (hachek)
188, // Capital ligature OE
189, // Small ligature oe
190, // Y with diaeresis
192, // A Grave
193, // A Acute
194, // A Circumflex
195, // A Tilde
196, // A Diaeresis
197, // A Ring
198, // AE Digraph
199, // C Cedilla
200, // E Grave
201, // E Acute
202, // E Circumflex
203, // E Diaeresis
204, // I Grave
205, // I Acute
206, // I Circumflex
207, // I Diaeresis
208, // Uppercase Eth
209, // N Tilde
210, // O Grave
211, // O Acute
212, // O Circumflex
213, // O Tilde
214, // O Diaeresis
216, // O Slash
217, // U Grave
218, // U Acute
219, // U Circumflex
220, // U Diaeresis
221, // Y Acute
222, // Uppercase Thorn
223, // German Double s
224, // a Grave
225, // a Acute
226, // a Circumflex
227, // a Tilde
228, // a Diaeresis
229, // a Ring
230, // ae Digraph
231, // c Cedilla
232, // e Grave
233, // e Acute
234, // e Circumflex
235, // e Diaeresis
236, // i Grave
237, // i Acute
238, // i Circumflex
239, // i Diaeresis
240, // Lowercase Eth
241, // n Tilde
242, // o Grave
243, // o Acute
244, // o Circumflex
245, // o Tilde
246, // o Diaeresis
248, // o Slash
249, // u Grave
250, // u Acute
251, // u Circumflex
252, // u Diaeresis
253, // y Acute
254, // Lowercase Thorn
255, // y Diaeresis
);
// Function to turn array above into a string.
function _charcodes_to_string($codes) {
$output = '';
foreach($codes as $code) {
$output .= chr($code);
}
return $output;
}
// Special chars character string for validation regexps.
global $LATIN_9_EXTCHARS_STRING;
$LATIN_9_EXTCHARS_STRING = _charcodes_to_string($LATIN_9_EXTCHARS);
=== Put in bootstrap.php -- ENDS ===
Then the actual validation function:
=== Put in app_model.php -- STARTS ===
/**
* Validator function for alphanumeric values with chars
* from the Latin-9 charset.
*
* @param array $data The data containing the field to be validated
as passed by the framework.
* @param boolean $digits Allow digits, true or false.
* @param boolean $spaces Allow spaces, true or false.
* @return boolean true if field validates, false if not.
*/
function latin9AlphaNumeric($data, $digits, $spaces) {
// $data should contain a single element, the field being
validated.
$target = array_pop($data);
// Compile the regexp.
$regex = '/[^A-Z' . $GLOBALS['LATIN_9_EXTCHARS_STRING'];
if ($digits === true) $regex .= '\\d';
if ($spaces === true) $regex .= ' ';
$regex .= ']/i';
// If preg_match returns 0 no offending chars were found, return
true.
// In any other case return false.
return preg_match($regex, $target) == 0 ? true : false;
}
=== Put in app_model.php -- ENDS ===
The validation function has parameters to allow/disallow digits and/or
spaces. I created wrappers (like latin9Alpha(), latin9AlphaNumeric()
etc.) for it to use in my validation definitions without extra
arguments, but it could be called straight as-is as well. Then you
just need to call it with both flags (digits, spaces) defined.
Otherwise CakePHP will pass some extra data as the second argument,
messing up the true/false evaluation for the flags. Refer to custom
validation functions with arguments in the 1.2 docs for details.
Hopefully this is useful to someone else out there! :)
Regards,
Max Romantschuk
http://max.romantschuk.fi/
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