How validate a personal identification number in cakephp - validation

Question

I need to validate a field in my form, this field belongs to the personal identification number of my country, this number has 10 digits
Example: card = 1710034065
2 1 2 1 2 1 2 1 2 (coefficient)
1 7 1 0 0 3 4 0 6 (personal identification number)
2 7 2 0 0 3 8 0 12 = 25 (Multiply each digit of the personal number by the
3 coefficient, if the result > 10 add between digits).
add multiplications
The result of the sum
25/10 = 2, Residue 5, divide 10 - residue 5 = 5 (check digit) ** which equals the last number of identity number**
Now I need is to implement this logic in the framework and I have no idea how,
I have a example code in java to get a better idea of what I need to do.
function check_cedula( form )
{
var cedula = form.cedula.value;
array = cedula.split( "" );
num = array.length;
if ( num == 10 )
{
total = 0;
digito = (array[9]*1);
for( i=0; i < (num-1); i++ )
{
mult = 0;
if ( ( i%2 ) != 0 ) {
total = total + ( array[i] * 1 );
}
else
{
mult = array[i] * 2;
if ( mult > 9 )
total = total + ( mult - 9 );
else
total = total + mult;
}
}
decena = total / 10;
decena = Math.floor( decena );
decena = ( decena + 1 ) * 10;
final = ( decena - total );
if ( ( final == 10 && digito == 0 ) || ( final == digito ) ) {
alert( "La c\xe9dula ES v\xe1lida!!!" );
return true;
}
else
{
alert( "La c\xe9dula NO es v\xe1lida!!!" );
return false;
}
}
else
{
alert("La c\xe9dula no puede tener menos de 10 d\xedgitos");
return false;
}
}

Answer 1

Let's say your model name is User and the field in the database is card, you would do the following;
<?php
class User extends AppModel {
/**
* Validation rules
*/
public $validate = array(
'card' => array(
'validateCard' => array(
'rule' => array('validateCard'),
'message' => 'Card does not validate'
)
)
);
/**
* Custom validation rule
* #return bool
*/
public function validateCard($field) {
$cardNumber = $field['card'];
// Here, perform your logic and return a boolean
}
}
Also, make sure in your view, you're using the FormHelper to output the form inputs and everything should play nice. For example;
<?php
echo $this->Form->create();
echo $this->Form->input('User.card');
echo $this->Form->end();