Validating POST data class - php

Question

This is an extension of a question I asked earlier that was deemed to be unsafe practise, due to the use of eval(). So I went for another approach but I have run into a problem. I do not know how to convert it to a class. My attempt ends with an error when I try to use call_user_func_array. it can't find the function in the class. Can you give me some hint so I get going? Thanks!
The error message I get when I try to run my code is Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'testlength' not found or invalid function name but on all validation methods. This is what I don't understand. This is what I want help to understand why it does not work.
class ruleValidator
{
protected $postData = array();
protected $ruleSet = array();
var $exceptions = 'Å,Ä,Þ,å,ä,þ,Ø,Ö,Ð,ø,ö,ð,Æ,Ü,æ,ü,á,é,í,ñ,ó,ú,ü,Á,É,Í,Ñ,Ó,Ê,Ú,Ü,ß';
function __construct(){
$this->exceptions = explode(',',$exceptions);
}
function testlength($string,$threshold)
{
return strlen($string)<$threshold?
'Your %s is too short.': // TRUE
''; // FALSE
}
function testnumeric($string,$offset,$length,$switch=true)
{
if(is_numeric(substr($string,$offset,$length))===$switch)
{
return $switch?
'Your %s has to begin with a character.': // Truely TRUE
'Your %s is containing non numeric characters. Please enter only digits.'; // Falsely TRUE
}
}
function testemail($string)
{
return filter_var($string, FILTER_VALIDATE_EMAIL)?
'': // TRUE
'Your email is not in a valid form.'; // FALSE
}
function testpattern($string,$pattern='/^[0-9]{8,10}$/')
{
return preg_match($pattern, $string)?
'': // TRUE
'Your %s is entered incorrect. Please use the correct format when entering data.'; // FALSE
}
function testequalto($string1,$string2)
{
return $string1==$string2?
'': // TRUE
'Your %s fields do not match eachother.'; // FALSE
}
function testchecked($bool)
{
return $bool===true?
'': // TRUE
'You are required to check this %s to continue.'; // FALSE
}
function testspecchar($string,$excludes=array())
{
if(is_array($excludes)&&!empty($excludes))
{
foreach($excludes as $exclude)
{
$string=str_replace($exclude,'',$string);
}
}
if(preg_match('/[^a-z0-9 ]+/i',$string))
{
return 'Your %s contains illegal characters.'; // TRUE
}
return; // FALSE
}
}
This is an array with how the POST data is recieved in the validator and the rules I use for the different fields in the form.
$exceptions = explode(',','Å,Ä,Þ,å,ä,þ,Ø,Ö,Ð,ø,ö,ð,Æ,Ü,æ,ü,á,é,í,ñ,ó,ú,ü,Á,É,Í,Ñ,Ó,Ê,Ú,Ü,ß');
$postData = array
(
'name' => 'Mikael',
'familyname' => 'Eriksson`',
'username' => 'Mik',
'password' => 'testtest',
'password-confirm' => 'testtesty',
'email' => 'try.to#guess.it,se',
'phone' => '0000000000a',
'policy' => 0
);
$ruleSet = array
(
'name'=>array
(
'testlength'=>2,
'testnumeric'=>array(0,1),
'testspecchar'=>array($exceptions)
),
'familyname'=>array
(
'testlength'=>2,
'testnumeric'=>array(0,1),
'testspecchar'=>array($exceptions)
),
'username'=>array
(
'testlength'=>4,
'testnumeric'=>array(0,1),
'testspecchar'=>array()
),
'email'=>array
(
'testemail'=>array()
),
'phone'=>array
(
'testnumeric'=>array(0,strlen($postData['phone']),false),
'testpattern'=>'/^[0-9]{8,10}$/'
),
'password'=>array
(
'testlength'=>8
),
'password-confirm'=>array
(
'testequalto'=>$postData['password-confirm']
),
'policy'=>array
(
'testchecked'=>array()
)
);
Here is how I validated the data up until now. It works, but I want to make this to a class to streamline the code in my project.
foreach($postData as $key => $value)
{
if(!array_key_exists($key,$ruleSet))
{
$errors[] = "The field `$key` is not part of the form. Only send actual form data.";
break;
}
$slice = array($key=>$ruleSet[$key]);
foreach($slice as $rules => $rule)
{
foreach($rule as $rls => $r)
{
$r = array_merge((array)$value,(array)$r);
$errors[] = sprintf(call_user_func_array($rls,$r),$key);
}
}
}
if(count($errors)>0) return implode(';;',array_filter($errors,'strlen'));

Answer 1

When you want to call a method of a class, you have to make an instance (using new) or call them statically when the methods are declared static.
In both ways, you have to tell call_user_func_array() that you are not calling a function in the global scope, but from within a class.
call_user_func_array(array('ruleValidator', $rls), $r)
Then declare the functions static:
public static function testlength($string,$threshold) {
}
Or with new:
$slice = array($key=>$ruleSet[$key]);
$callbackClass = new ruleValidator();
foreach($slice as $rules => $rule)
/** ... */
call_user_func_array(array($callbackClass, $rls), $r)

Answer 2

Thanks #Deadooshka for providing me with the solution.
call_user_func_array("ruleValidator::$rls", $r)