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<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
/**
* CodeIgniter
*
* An open source application development framework for PHP 5.2.4 or newer
*
* NOTICE OF LICENSE
*
* Licensed under the Open Software License version 3.0
*
* This source file is subject to the Open Software License (OSL 3.0) that is
* bundled with this package in the files license.txt / license.rst. It is
* also available through the world wide web at this URL:
* http://opensource.org/licenses/OSL-3.0
* If you did not receive a copy of the license and are unable to obtain it
* through the world wide web, please send an email to
* licensing@ellislab.com so we can send you a copy immediately.
*
* @package CodeIgniter
* @author EllisLab Dev Team
* @copyright Copyright (c) 2008 - 2012, EllisLab, Inc. (http://ellislab.com/)
* @license http://opensource.org/licenses/OSL-3.0 Open Software License (OSL 3.0)
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/

/**
* Form Validation Class
*
* @package CodeIgniter
* @subpackage Libraries
* @category Validation
* @author EllisLab Dev Team
* @link http://codeigniter.com/user_guide/libraries/form_validation.html
*/
class CI_Form_validation {

/**
* Reference to the CodeIgniter instance
*
* @var object
*/
protected $CI;

/**
* Validation data for the current form submission
*
* @var array
*/
protected $_field_data = array();

/**
* Validation rules for the current form
*
* @var array
*/
protected $_config_rules = array();

/**
* Array of validation errors
*
* @var array
*/
protected $_error_array = array();

/**
* Array of custom error messages
*
* @var array
*/
protected $_error_messages = array();

/**
* Start tag for error wrapping
*
* @var string
*/
protected $_error_prefix = '<p>';

/**
* End tag for error wrapping
*
* @var string
*/
protected $_error_suffix = '</p>';

/**
* Custom error message
*
* @var string
*/
protected $error_string = '';

/**
* Whether the form data has been validated as safe
*
* @var bool
*/
protected $_safe_form_data = FALSE;

/**
* Custom data to validate
*
* @var array
*/
protected $validation_data = array();

/**
* Initialize Form_Validation class
*
* @param array $rules
* @return void
*/
public function __construct($rules = array())
{
$this->CI =& get_instance();

// applies delimiters set in config file.
if (isset($rules['error_prefix']))
{
$this->_error_prefix = $rules['error_prefix'];
unset($rules['error_prefix']);
}
if (isset($rules['error_suffix']))
{
$this->_error_suffix = $rules['error_suffix'];
unset($rules['error_suffix']);
}

// Validation rules can be stored in a config file.
$this->_config_rules = $rules;

// Automatically load the form helper
$this->CI->load->helper('form');

// Set the character encoding in MB.
if (MB_ENABLED === TRUE)
{
mb_internal_encoding($this->CI->config->item('charset'));
}

log_message('debug', 'Form Validation Class Initialized');
}

// --------------------------------------------------------------------

/**
* Set Rules
*
* This function takes an array of field names and validation
* rules as input, validates the info, and stores it
*
* @param mixed $field
* @param string $label
* @param mixed $rules
* @return object
*/
public function set_rules($field, $label = '', $rules = '')
{
// No reason to set rules if we have no POST data
// or a validation array has not been specified
if ($this->CI->input->method() !== 'post' && empty($this->validation_data))
{
return $this;
}

// If an array was passed via the first parameter instead of individual string
// values we cycle through it and recursively call this function.
if (is_array($field))
{
foreach ($field as $row)
{
// Houston, we have a problem...
if ( ! isset($row['field'], $row['rules']))
{
continue;
}

// If the field label wasn't passed we use the field name
$label = isset($row['label']) ? $row['label'] : $row['field'];

// Here we go!
$this->set_rules($row['field'], $label, $row['rules']);
}

return $this;
}

// Convert an array of rules to a string
if (is_array($rules))
{
$rules = implode('|', $rules);
}

// No fields? Nothing to do...
if ( ! is_string($field) OR ! is_string($rules) OR $field === '')
{
return $this;
}

// If the field label wasn't passed we use the field name
$label = ($label === '') ? $field : $label;

// Is the field name an array? If it is an array, we break it apart
// into its components so that we can fetch the corresponding POST data later
if (preg_match_all('/\[(.*?)\]/', $field, $matches))
{
// Note: Due to a bug in current() that affects some versions
// of PHP we can not pass function call directly into it
$x = explode('[', $field);
$indexes[] = current($x);

for ($i = 0, $c = count($matches[0]); $i < $c; $i++)
{
if ($matches[1][$i] !== '')
{
$indexes[] = $matches[1][$i];
}
}

$is_array = TRUE;
}
else
{
$indexes = array();
$is_array = FALSE;
}

// Build our master array
$this->_field_data[$field] = array(
'field' => $field,
'label' => $label,
'rules' => $rules,
'is_array' => $is_array,
'keys' => $indexes,
'postdata' => NULL,
'error' => ''
);

return $this;
}

// --------------------------------------------------------------------

/**
* By default, form validation uses the $_POST array to validate
*
* If an array is set through this method, then this array will
* be used instead of the $_POST array
*
* Note that if you are validating multiple arrays, then the
* reset_validation() function should be called after validating
* each array due to the limitations of CI's singleton
*
* @param array $data
* @return void
*/
public function set_data($data = '')
{
if ( ! empty($data) && is_array($data))
{
$this->validation_data = $data;
}
}

// --------------------------------------------------------------------

/**
* Set Error Message
*
* Lets users set their own error messages on the fly. Note:
* The key name has to match the function name that it corresponds to.
*
* @param array
* @param string
* @return object
*/
public function set_message($lang, $val = '')
{
if ( ! is_array($lang))
{
$lang = array($lang => $val);
}

$this->_error_messages = array_merge($this->_error_messages, $lang);
return $this;
}

// --------------------------------------------------------------------

/**
* Set The Error Delimiter
*
* Permits a prefix/suffix to be added to each error message
*
* @param string
* @param string
* @return object
*/
public function set_error_delimiters($prefix = '<p>', $suffix = '</p>')
{
$this->_error_prefix = $prefix;
$this->_error_suffix = $suffix;
return $this;
}

// --------------------------------------------------------------------

/**
* Get Error Message
*
* Gets the error message associated with a particular field
*
* @param string the field name
* @param string the html start tag
* @param strign the html end tag
* @return string
*/
public function error($field = '', $prefix = '', $suffix = '')
{
if (empty($this->_field_data[$field]['error']))
{
return '';
}

if ($prefix === '')
{
$prefix = $this->_error_prefix;
}

if ($suffix === '')
{
$suffix = $this->_error_suffix;
}

return $prefix.$this->_field_data[$field]['error'].$suffix;
}

// --------------------------------------------------------------------

/**
* Get Array of Error Messages
*
* Returns the error messages as an array
*
* @return array
*/
public function error_array()
{
return $this->_error_array;
}

// --------------------------------------------------------------------

/**
* Error String
*
* Returns the error messages as a string, wrapped in the error delimiters
*
* @param string
* @param string
* @return string
*/
public function error_string($prefix = '', $suffix = '')
{
// No errrors, validation passes!
if (count($this->_error_array) === 0)
{
return '';
}

if ($prefix === '')
{
$prefix = $this->_error_prefix;
}

if ($suffix === '')
{
$suffix = $this->_error_suffix;
}

// Generate the error string
$str = '';
foreach ($this->_error_array as $val)
{
if ($val !== '')
{
$str .= $prefix.$val.$suffix."\n";
}
}

return $str;
}

// --------------------------------------------------------------------

/**
* Run the Validator
*
* This function does all the work.
*
* @param string $group
* @return bool
*/
public function run($group = '')
{
// Do we even have any data to process? Mm?
$validation_array = empty($this->validation_data) ? $_POST : $this->validation_data;
if (count($validation_array) === 0)
{
return FALSE;
}

// Does the _field_data array containing the validation rules exist?
// If not, we look to see if they were assigned via a config file
if (count($this->_field_data) === 0)
{
// No validation rules? We're done...
if (count($this->_config_rules) === 0)
{
return FALSE;
}

// Is there a validation rule for the particular URI being accessed?
$uri = ($group === '') ? trim($this->CI->uri->ruri_string(), '/') : $group;

if ($uri !== '' && isset($this->_config_rules[$uri]))
{
$this->set_rules($this->_config_rules[$uri]);
}
else
{
$this->set_rules($this->_config_rules);
}

// Were we able to set the rules correctly?
if (count($this->_field_data) === 0)
{
log_message('debug', 'Unable to find validation rules');
return FALSE;
}
}

// Load the language file containing error messages
$this->CI->lang->load('form_validation');

// Cycle through the rules for each field, match the
// corresponding $_POST item and test for errors
foreach ($this->_field_data as $field => $row)
{
// Fetch the data from the corresponding $_POST or validation array and cache it in the _field_data array.
// Depending on whether the field name is an array or a string will determine where we get it from.
if ($row['is_array'] === TRUE)
{
$this->_field_data[$field]['postdata'] = $this->_reduce_array($validation_array, $row['keys']);
}
elseif (isset($validation_array[$field]) && $validation_array[$field] !== '')
{
$this->_field_data[$field]['postdata'] = $validation_array[$field];
}

// Don't try to validate if we have no rules set
if (empty($row['rules']))
{
continue;
}

$this->_execute($row, explode('|', $row['rules']), $this->_field_data[$field]['postdata']);
}

// Did we end up with any errors?
$total_errors = count($this->_error_array);
if ($total_errors > 0)
{
$this->_safe_form_data = TRUE;
}

// Now we need to re-set the POST data with the new, processed data
$this->_reset_post_array();

return ($total_errors === 0);
}

// --------------------------------------------------------------------

/**
* Traverse a multidimensional $_POST array index until the data is found
*
* @param array
* @param array
* @param int
* @return mixed
*/
protected function _reduce_array($array, $keys, $i = 0)
{
if (is_array($array) && isset($keys[$i]))
{
return isset($array[$keys[$i]]) ? $this->_reduce_array($array[$keys[$i]], $keys, ($i+1)) : NULL;
}

return $array;
}

// --------------------------------------------------------------------

/**
* Re-populate the _POST array with our finalized and processed data
*
* @return void
*/
protected function _reset_post_array()
{
foreach ($this->_field_data as $field => $row)
{
if ( ! is_null($row['postdata']))
{
if ($row['is_array'] === FALSE)
{
if (isset($_POST[$row['field']]))
{
$_POST[$row['field']] = $this->prep_for_form($row['postdata']);
}
}
else
{
// start with a reference
$post_ref =& $_POST;

// before we assign values, make a reference to the right POST key
if (count($row['keys']) === 1)
{
$post_ref =& $post_ref[current($row['keys'])];
}
else
{
foreach ($row['keys'] as $val)
{
$post_ref =& $post_ref[$val];
}
}

if (is_array($row['postdata']))
{
$array = array();
foreach ($row['postdata'] as $k => $v)
{
$array[$k] = $this->prep_for_form($v);
}

$post_ref = $array;
}
else
{
$post_ref = $this->prep_for_form($row['postdata']);
}
}
}
}
}

// --------------------------------------------------------------------

/**
* Executes the Validation routines
*
* @param array
* @param array
* @param mixed
* @param int
* @return mixed
*/
protected function _execute($row, $rules, $postdata = NULL, $cycles = 0)
{
// If the $_POST data is an array we will run a recursive call
if (is_array($postdata))
{
foreach ($postdata as $key => $val)
{
$this->_execute($row, $rules, $val, $key);
}

return;
}

// If the field is blank, but NOT required, no further tests are necessary
$callback = FALSE;
if ( ! in_array('required', $rules) && is_null($postdata))
{
// Before we bail out, does the rule contain a callback?
if (preg_match('/(callback_\w+(\[.*?\])?)/', implode(' ', $rules), $match))
{
$callback = TRUE;
$rules = array(1 => $match[1]);
}
else
{
return;
}
}

// Isset Test. Typically this rule will only apply to checkboxes.
if (is_null($postdata) && $callback === FALSE)
{
if (in_array('isset', $rules, TRUE) OR in_array('required', $rules))
{
// Set the message type
$type = in_array('required', $rules) ? 'required' : 'isset';

if (isset($this->_error_messages[$type]))
{
$line = $this->_error_messages[$type];
}
elseif (FALSE === ($line = $this->CI->lang->line($type)))
{
$line = 'The field was not set';
}

// Build the error message
$message = sprintf($line, $this->_translate_fieldname($row['label']));

// Save the error message
$this->_field_data[$row['field']]['error'] = $message;

if ( ! isset($this->_error_array[$row['field']]))
{
$this->_error_array[$row['field']] = $message;
}
}

return;
}

// --------------------------------------------------------------------

// Cycle through each rule and run it
foreach ($rules as $rule)
{
$_in_array = FALSE;

// We set the $postdata variable with the current data in our master array so that
// each cycle of the loop is dealing with the processed data from the last cycle
if ($row['is_array'] === TRUE && is_array($this->_field_data[$row['field']]['postdata']))
{
// We shouldn't need this safety, but just in case there isn't an array index
// associated with this cycle we'll bail out
if ( ! isset($this->_field_data[$row['field']]['postdata'][$cycles]))
{
continue;
}

$postdata = $this->_field_data[$row['field']]['postdata'][$cycles];
$_in_array = TRUE;
}
else
{
// If we get an array field, but it's not expected - then it is most likely
// somebody messing with the form on the client side, so we'll just consider
// it an empty field
$postdata = is_array($this->_field_data[$row['field']]['postdata'])
? NULL
: $this->_field_data[$row['field']]['postdata'];
}

// Is the rule a callback?
$callback = FALSE;
if (strpos($rule, 'callback_') === 0)
{
$rule = substr($rule, 9);
$callback = TRUE;
}

// Strip the parameter (if exists) from the rule
// Rules can contain a parameter: max_length[5]
$param = FALSE;
if (preg_match('/(.*?)\[(.*)\]/', $rule, $match))
{
$rule = $match[1];
$param = $match[2];
}

// Call the function that corresponds to the rule
if ($callback === TRUE)
{
if ( ! method_exists($this->CI, $rule))
{
log_message('debug', 'Unable to find callback validation rule: '.$rule);
$result = FALSE;
}
else
{
// Run the function and grab the result
$result = $this->CI->$rule($postdata, $param);
}

// Re-assign the result to the master data array
if ($_in_array === TRUE)
{
$this->_field_data[$row['field']]['postdata'][$cycles] = is_bool($result) ? $postdata : $result;
}
else
{
$this->_field_data[$row['field']]['postdata'] = is_bool($result) ? $postdata : $result;
}

// If the field isn't required and we just processed a callback we'll move on...
if ( ! in_array('required', $rules, TRUE) && $result !== FALSE)
{
continue;
}
}
elseif ( ! method_exists($this, $rule))
{
// If our own wrapper function doesn't exist we see if a native PHP function does.
// Users can use any native PHP function call that has one param.
if (function_exists($rule))
{
$result = ($param !== FALSE) ? $rule($postdata, $param) : $rule($postdata);

if ($_in_array === TRUE)
{
$this->_field_data[$row['field']]['postdata'][$cycles] = is_bool($result) ? $postdata : $result;
}
else
{
$this->_field_data[$row['field']]['postdata'] = is_bool($result) ? $postdata : $result;
}
}
else
{
log_message('debug', 'Unable to find validation rule: '.$rule);
$result = FALSE;
}
}
else
{
$result = $this->$rule($postdata, $param);

if ($_in_array === TRUE)
{
$this->_field_data[$row['field']]['postdata'][$cycles] = is_bool($result) ? $postdata : $result;
}
else
{
$this->_field_data[$row['field']]['postdata'] = is_bool($result) ? $postdata : $result;
}
}

// Did the rule test negatively? If so, grab the error.
if ($result === FALSE)
{
if ( ! isset($this->_error_messages[$rule]))
{
if (FALSE === ($line = $this->CI->lang->line($rule)))
{
$line = 'Unable to access an error message corresponding to your field name.';
}
}
else
{
$line = $this->_error_messages[$rule];
}

// Is the parameter we are inserting into the error message the name
// of another field? If so we need to grab its "field label"
if (isset($this->_field_data[$param], $this->_field_data[$param]['label']))
{
$param = $this->_translate_fieldname($this->_field_data[$param]['label']);
}

// Build the error message
$message = sprintf($line, $this->_translate_fieldname($row['label']), $param);

// Save the error message
$this->_field_data[$row['field']]['error'] = $message;

if ( ! isset($this->_error_array[$row['field']]))
{
$this->_error_array[$row['field']] = $message;
}

return;
}
}
}

// --------------------------------------------------------------------

/**
* Translate a field name
*
* @param string the field name
* @return string
*/
protected function _translate_fieldname($fieldname)
{
// Do we need to translate the field name?
// We look for the prefix lang: to determine this
if (strpos($fieldname, 'lang:') === 0)
{
// Grab the variable
$line = substr($fieldname, 5);

// Were we able to translate the field name? If not we use $line
if (FALSE === ($fieldname = $this->CI->lang->line($line)))
{
return $line;
}
}

return $fieldname;
}

// --------------------------------------------------------------------

/**
* Get the value from a form
*
* Permits you to repopulate a form field with the value it was submitted
* with, or, if that value doesn't exist, with the default
*
* @param string the field name
* @param string
* @return string
*/
public function set_value($field = '', $default = '')
{
if ( ! isset($this->_field_data[$field], $this->_field_data[$field]['postdata']))
{
return $default;
}

// If the data is an array output them one at a time.
// E.g: form_input('name[]', set_value('name[]');
if (is_array($this->_field_data[$field]['postdata']))
{
return array_shift($this->_field_data[$field]['postdata']);
}

return $this->_field_data[$field]['postdata'];
}

// --------------------------------------------------------------------

/**
* Set Select
*
* Enables pull-down lists to be set to the value the user
* selected in the event of an error
*
* @param string
* @param string
* @param bool
* @return string
*/
public function set_select($field = '', $value = '', $default = FALSE)
{
if ( ! isset($this->_field_data[$field], $this->_field_data[$field]['postdata']))
{
return ($default === TRUE && count($this->_field_data) === 0) ? ' selected="selected"' : '';
}

$field = $this->_field_data[$field]['postdata'];
if (is_array($field))
{
if ( ! in_array($value, $field))
{
return '';
}
}
elseif (($field === '' OR $value === '') OR ($field !== $value))
{
return '';
}

return ' selected="selected"';
}

// --------------------------------------------------------------------

/**
* Set Radio
*
* Enables radio buttons to be set to the value the user
* selected in the event of an error
*
* @param string
* @param string
* @param bool
* @return string
*/
public function set_radio($field = '', $value = '', $default = FALSE)
{
if ( ! isset($this->_field_data[$field], $this->_field_data[$field]['postdata']))
{
return ($default === TRUE && count($this->_field_data) === 0) ? ' checked="checked"' : '';
}

$field = $this->_field_data[$field]['postdata'];
if (is_array($field))
{
if ( ! in_array($value, $field))
{
return '';
}
}
elseif (($field === '' OR $value === '') OR ($field !== $value))
{
return '';
}

return ' checked="checked"';
}

// --------------------------------------------------------------------

/**
* Set Checkbox
*
* Enables checkboxes to be set to the value the user
* selected in the event of an error
*
* @param string
* @param string
* @param bool
* @return string
*/
public function set_checkbox($field = '', $value = '', $default = FALSE)
{
// Logic is exactly the same as for radio fields
return $this->set_radio($field, $value, $default);
}

// --------------------------------------------------------------------

/**
* Required
*
* @param string
* @return bool
*/
public function required($str)
{
return is_array($str) ? (bool) count($str) : (trim($str) !== '');
}

// --------------------------------------------------------------------

/**
* Performs a Regular Expression match test.
*
* @param string
* @param string regex
* @return bool
*/
public function regex_match($str, $regex)
{
return (bool) preg_match($regex, $str);
}

// --------------------------------------------------------------------

/**
* Match one field to another
*
* @param string
* @param string field
* @return bool
*/
public function matches($str, $field)
{
if ( ! isset($this->_field_data[$field]) )
{
return FALSE;
}

return $str === $this->_field_data[$field]['postdata'];
}

// --------------------------------------------------------------------

/**
* Is Unique
*
* Check if the input value doesn't already exist
* in the specified database field.
*
* @param string
* @param string field
* @return bool
*/
public function is_unique($str, $field)
{
list($table, $field) = explode('.', $field);
if (isset($this->CI->db))
{
$query = $this->CI->db->limit(1)->get_where($table, array($field => $str));
return $query->num_rows() === 0;
}
return FALSE;
}

// --------------------------------------------------------------------

/**
* Minimum Length
*
* @param string
* @param string
* @return bool
*/
public function min_length($str, $val)
{
if ( ! is_numeric($val))
{
return FALSE;
}
else
{
$val = (int) $val;
}

return (MB_ENABLED === TRUE)
? ($val <= mb_strlen($str))
: ($val <= strlen($str));
}

// --------------------------------------------------------------------

/**
* Max Length
*
* @param string
* @param string
* @return bool
*/
public function max_length($str, $val)
{
if ( ! is_numeric($val))
{
return FALSE;
}
else
{
$val = (int) $val;
}

return (MB_ENABLED === TRUE)
? ($val >= mb_strlen($str))
: ($val >= strlen($str));
}

// --------------------------------------------------------------------

/**
* Exact Length
*
* @param string
* @param string
* @return bool
*/
public function exact_length($str, $val)
{
if ( ! is_numeric($val))
{
return FALSE;
}
else
{
$val = (int) $val;
}

return (MB_ENABLED === TRUE)
? (mb_strlen($str) === $val)
: (strlen($str) === $val);
}

// --------------------------------------------------------------------

/**
* Valid Email
*
* @param string
* @return bool
*/
public function valid_email($str)
{
return (bool) filter_var($str, FILTER_VALIDATE_EMAIL);
}

// --------------------------------------------------------------------

/**
* Valid Emails
*
* @param string
* @return bool
*/
public function valid_emails($str)
{
if (strpos($str, ',') === FALSE)
{
return $this->valid_email(trim($str));
}

foreach (explode(',', $str) as $email)
{
if (trim($email) !== '' && $this->valid_email(trim($email)) === FALSE)
{
return FALSE;
}
}

return TRUE;
}

// --------------------------------------------------------------------

/**
* Validate IP Address
*
* @param string
* @param string 'ipv4' or 'ipv6' to validate a specific IP format
* @return bool
*/
public function valid_ip($ip, $which = '')
{
return $this->CI->input->valid_ip($ip, $which);
}

// --------------------------------------------------------------------

/**
* Alpha
*
* @param string
* @return bool
*/
public function alpha($str)
{
return ctype_alpha($str);
}

// --------------------------------------------------------------------

/**
* Alpha-numeric
*
* @param string
* @return bool
*/
public function alpha_numeric($str)
{
return ctype_alnum((string) $str);
}

// --------------------------------------------------------------------

/**
* Alpha-numeric with underscores and dashes
*
* @param string
* @return bool
*/
public function alpha_dash($str)
{
return (bool) preg_match('/^[a-z0-9_-]+$/i', $str);
}

// --------------------------------------------------------------------

/**
* Numeric
*
* @param string
* @return bool
*/
public function numeric($str)
{
return (bool) preg_match('/^[\-+]?[0-9]*\.?[0-9]+$/', $str);

}

// --------------------------------------------------------------------

/**
* Integer
*
* @param string
* @return bool
*/
public function integer($str)
{
return (bool) preg_match('/^[\-+]?[0-9]+$/', $str);
}

// --------------------------------------------------------------------

/**
* Decimal number
*
* @param string
* @return bool
*/
public function decimal($str)
{
return (bool) preg_match('/^[\-+]?[0-9]+\.[0-9]+$/', $str);
}

// --------------------------------------------------------------------

/**
* Greater than
*
* @param string
* @param int
* @return bool
*/
public function greater_than($str, $min)
{
return is_numeric($str) ? ($str > $min) : FALSE;
}

// --------------------------------------------------------------------

/**
* Equal to or Greater than
*
* @param string
* @param int
* @return bool
*/
public function greater_than_equal_to($str, $min)
{
return is_numeric($str) ? ($str >= $min) : FALSE;
}

// --------------------------------------------------------------------

/**
* Less than
*
* @param string
* @param int
* @return bool
*/
public function less_than($str, $max)
{
return is_numeric($str) ? ($str < $max) : FALSE;
}

// --------------------------------------------------------------------

/**
* Equal to or Less than
*
* @param string
* @param int
* @return bool
*/
public function less_than_equal_to($str, $max)
{
return is_numeric($str) ? ($str <= $max) : FALSE;
}

// --------------------------------------------------------------------

/**
* Is a Natural number (0,1,2,3, etc.)
*
* @param string
* @return bool
*/
public function is_natural($str)
{
return ctype_digit((string) $str);
}

// --------------------------------------------------------------------

/**
* Is a Natural number, but not a zero (1,2,3, etc.)
*
* @param string
* @return bool
*/
public function is_natural_no_zero($str)
{
return ($str != 0 && ctype_digit((string) $str));
}

// --------------------------------------------------------------------

/**
* Valid Base64
*
* Tests a string for characters outside of the Base64 alphabet
* as defined by RFC 2045 http://www.faqs.org/rfcs/rfc2045
*
* @param string
* @return bool
*/
public function valid_base64($str)
{
return ! preg_match('/[^a-zA-Z0-9\/\+=]/', $str);
}

// --------------------------------------------------------------------

/**
* Prep data for form
*
* This function allows HTML to be safely shown in a form.
* Special characters are converted.
*
* @param string
* @return string
*/
public function prep_for_form($data = '')
{
if (is_array($data))
{
foreach ($data as $key => $val)
{
$data[$key] = $this->prep_for_form($val);
}

return $data;
}

if ($this->_safe_form_data === FALSE OR $data === '')
{
return $data;
}

return str_replace(array("'", '"', '<', '>'), array('&#39;', '&quot;', '&lt;', '&gt;'), stripslashes($data));
}

// --------------------------------------------------------------------

/**
* Prep URL
*
* @param string
* @return string
*/
public function prep_url($str = '')
{
if ($str === 'http://' OR $str === '')
{
return '';
}

if (strpos($str, 'http://') !== 0 && strpos($str, 'https://') !== 0)
{
return 'http://'.$str;
}

return $str;
}

// --------------------------------------------------------------------

/**
* Strip Image Tags
*
* @param string
* @return string
*/
public function strip_image_tags($str)
{
return $this->CI->security->strip_image_tags($str);
}

// --------------------------------------------------------------------

/**
* XSS Clean
*
* @param string
* @return string
*/
public function xss_clean($str)
{
return $this->CI->security->xss_clean($str);
}

// --------------------------------------------------------------------

/**
* Convert PHP tags to entities
*
* @param string
* @return string
*/
public function encode_php_tags($str)
{
return str_replace(array('<?', '?>'), array('&lt;?', '?&gt;'), $str);
}

// --------------------------------------------------------------------

/**
* Reset validation vars
*
* Prevents subsequent validation routines from being affected by the
* results of any previous validation routine due to the CI singleton.
*
* @return void
*/
public function reset_validation()
{
$this->_field_data = array();
$this->_config_rules = array();
$this->_error_array = array();
$this->_error_messages = array();
$this->error_string = '';
}

}

/* End of file Form_validation.php */
/* Location: ./system/libraries/Form_validation.php */
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