diff --git a/system/libraries/Form_validation.php b/system/libraries/Form_validation.php
new file mode 100644
index 0000000..fd0c22e
--- /dev/null
+++ b/system/libraries/Form_validation.php
@@ -0,0 +1,1220 @@
+<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+/**
+ * CodeIgniter
+ *
+ * An open source application development framework for PHP 4.3.2 or newer
+ *
+ * @package CodeIgniter
+ * @author ExpressionEngine Dev Team
+ * @copyright Copyright (c) 2006, EllisLab, Inc.
+ * @license http://codeigniter.com/user_guide/license.html
+ * @link http://codeigniter.com
+ * @since Version 1.0
+ * @filesource
+ */
+
+// ------------------------------------------------------------------------
+
+/**
+ * Form Validation Class
+ *
+ * @package CodeIgniter
+ * @subpackage Libraries
+ * @category Validation
+ * @author ExpressionEngine Dev Team
+ * @link http://codeigniter.com/user_guide/libraries/form_validation.html
+ */
+class CI_Form_validation {
+
+ var $CI;
+ var $_field_data = array();
+ var $_config_rules = array();
+ var $_error_array = array();
+ var $_error_messages = array();
+ var $_error_prefix = '<p>';
+ var $_error_suffix = '</p>';
+ var $error_string = '';
+ var $_safe_form_data = FALSE;
+
+
+ /**
+ * Constructor
+ *
+ */
+ function CI_Form_validation($rules = array())
+ {
+ $this->CI =& get_instance();
+
+ // Validation rules can be stored in a config file.
+ $this->_config_rules = $rules;
+
+ // Automatically load the form helper
+ $this->CI->load->helper('form');
+
+ log_message('debug', "Validation Class Initialized");
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Rules
+ *
+ * This function takes an array of field names and validation
+ * rules as input, validates the info, and stores it
+ *
+ * @access public
+ * @param mixed
+ * @param string
+ * @return void
+ */
+ function set_rules($field, $label = '', $rules = '')
+ {
+ // No reason to set rules if we have no POST data
+ if (count($_POST) == 0)
+ {
+ return;
+ }
+
+ // If an array was passed via the first parameter instead of indidual 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']) OR ! isset($row['rules']))
+ {
+ continue;
+ }
+
+ // If the field label wasn't passed we use the field name
+ $label = ( ! isset($row['label'])) ? $row['field'] : $row['label'];
+
+ // Here we go!
+ $this->set_rules($row['field'], $label, $row['rules']);
+ }
+ return;
+ }
+
+ // No rules or fields? Nothing to do...
+ if ( ! is_string($field) OR ! is_string($rules) OR $field == '' OR $rules == '')
+ {
+ return;
+ }
+
+ // If the field label wasn't passed we use the field name
+ $label = ($label == '') ? $field : $label;
+
+ // Is the field name an array? We test for the existence of a bracket "[" in
+ // the field name to determine this. If it is an array, we break it apart
+ // into its components so that we can fetch the corresponding POST data later
+ if (strpos($field, '[') !== FALSE AND 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; $i < count($matches['0']); $i++)
+ {
+ if ($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' => $indexes,
+ 'postdata' => NULL,
+ 'error' => ''
+ );
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Error Message
+ *
+ * Lets users set their own error messages on the fly. Note: The key
+ * name has to match the function name that it corresponds to.
+ *
+ * @access public
+ * @param string
+ * @param string
+ * @return string
+ */
+ function set_message($lang, $val = '')
+ {
+ if ( ! is_array($lang))
+ {
+ $lang = array($lang => $val);
+ }
+
+ $this->_error_messages = array_merge($this->_error_messages, $lang);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set The Error Delimiter
+ *
+ * Permits a prefix/suffix to be added to each error message
+ *
+ * @access public
+ * @param string
+ * @param string
+ * @return void
+ */
+ function set_error_delimiters($prefix = '<p>', $suffix = '</p>')
+ {
+ $this->_error_prefix = $prefix;
+ $this->_error_suffix = $suffix;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Get Error Message
+ *
+ * Gets the error message associated with a particular field
+ *
+ * @access public
+ * @param string the field name
+ * @return void
+ */
+ function error($field = '', $prefix = '', $suffix = '')
+ {
+ if ( ! isset($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;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Error String
+ *
+ * Returns the error messages as a string, wrapped in the error delimiters
+ *
+ * @access public
+ * @param string
+ * @param string
+ * @return str
+ */
+ 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)
+ {
+ $str .= $prefix.$val.$suffix."\n";
+ }
+
+ return $str;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Run the Validator
+ *
+ * This function does all the work.
+ *
+ * @access public
+ * @return bool
+ */
+ function run($group = '')
+ {
+ // Do we even have any data to process? Mm?
+ if (count($_POST) == 0)
+ {
+ return FALSE;
+ }
+
+ // Does the _field_data array containing the validation rules exist?
+ // If not, we look to see if they were assigned via a config file
+ if (count($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 != '' AND isset($this->_config_rules[$uri]))
+ {
+ $this->set_rules($this->_config_rules[$uri]);
+ }
+ else
+ {
+ $this->set_rules($this->_config_rules);
+ }
+
+ // We're 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 $_POST array and cache it in the _field_data array.
+ // Depending on whether the field name is an array or a string will determine where we get it from.
+
+ if ($row['is_array'] == TRUE)
+ {
+ $this->_field_data[$field]['postdata'] = $this->_reduce_array($_POST, $row['keys']);
+ }
+ else
+ {
+ if (isset($_POST[$field]))
+ {
+ $this->_field_data[$field]['postdata'] = $_POST[$field];
+ }
+ }
+
+ $this->_execute($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
+ $this->_reset_post_array();
+
+ // No errors, validation passes!
+ if ($total_errors == 0)
+ {
+ return TRUE;
+ }
+
+ // Validation fails
+ return FALSE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Traverse a multidimensional $_POST array index until the data is found
+ *
+ * @access private
+ * @param array
+ * @param array
+ * @param integer
+ * @return mixed
+ */
+ function _reduce_array($array, $keys, $i = 0)
+ {
+ if (is_array($array))
+ {
+ if (isset($keys[$i]))
+ {
+ if (isset($array[$keys[$i]]))
+ {
+ $array = $this->_reduce_array($array[$keys[$i]], $keys, ($i+1));
+ }
+ else
+ {
+ return NULL;
+ }
+ }
+ else
+ {
+ return $array;
+ }
+ }
+
+ return $array;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Re-populate the _POST array with our finalized and processed data
+ *
+ * @access private
+ * @return null
+ */
+ function _reset_post_array()
+ {
+ foreach ($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
+ {
+ $post = '$_POST["';
+
+ if (count($row['keys']) == 1)
+ {
+ $post .= current($row['keys']);
+ $post .= '"]';
+ }
+ else
+ {
+ $i = 0;
+ foreach ($row['keys'] as $val)
+ {
+ if ($i == 0)
+ {
+ $post .= $val.'"]';
+ $i++;
+ continue;
+ }
+
+ $post .= '["'.$val.'"]';
+ }
+ }
+
+ if (is_array($row['postdata']))
+ {
+ $array = array();
+ foreach ($row['postdata'] as $k => $v)
+ {
+ $array[$k] = $this->prep_for_form($v);
+ }
+
+ $post .= ' = $array;';
+ }
+ else
+ {
+ $post .= ' = "'.$this->prep_for_form($row['postdata']).'";';
+ }
+
+ eval($post);
+ }
+ }
+ }
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Executes the Validation routines
+ *
+ * @access private
+ * @param array
+ * @param array
+ * @param mixed
+ * @param integer
+ * @return mixed
+ */
+ 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, $cycles);
+ $cycles++;
+ }
+
+ return;
+ }
+
+ // --------------------------------------------------------------------
+
+ // If the field is blank, but NOT required, no further tests are necessary
+ if ( ! in_array('required', $rules, TRUE) AND is_null($postdata))
+ {
+ return;
+ }
+
+ // --------------------------------------------------------------------
+
+ // Isset Test. Typically this rule will only apply to checkboxes.
+ if (is_null($postdata))
+ {
+ if (in_array('isset', $rules, TRUE) OR in_array('required', $rules))
+ {
+ if ( ! isset($this->_error_messages['isset']))
+ {
+ if (FALSE === ($line = $this->CI->lang->line('isset')))
+ {
+ $line = 'The field was not set';
+ }
+ }
+ else
+ {
+ $line = $this->_error_messages['isset'];
+ }
+
+ // Build the error message
+ $message = sprintf($line, $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 AND 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
+ {
+ $postdata = $this->_field_data[$row['field']]['postdata'];
+ }
+
+ // --------------------------------------------------------------------
+
+ // Is the rule a callback?
+ $callback = FALSE;
+ if (substr($rule, 0, 9) == 'callback_')
+ {
+ $rule = substr($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))
+ {
+ continue;
+ }
+
+ // 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) AND $result !== FALSE)
+ {
+ return;
+ }
+ }
+ else
+ {
+ if ( ! method_exists($this, $rule))
+ {
+ /*
+ * Run the native PHP function if called for
+ *
+ * If our own wrapper function doesn't exist we see
+ * if a native PHP function does. Users can use
+ * any native PHP function call that has one param.
+ */
+ if (function_exists($rule))
+ {
+ $result = $rule($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;
+ }
+ }
+
+ continue;
+ }
+
+ $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];
+ }
+
+ // Build the error message
+ $message = sprintf($line, $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']] = $message;
+ }
+
+ return;
+ }
+ }
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Get the value from a form
+ *
+ * Permits you to repopulate a form field with the value it was submitted
+ * with, or, if that value doesn't exist, with the default
+ *
+ * @access public
+ * @param string the field name
+ * @param string
+ * @return void
+ */
+ function set_value($field = '', $default = '')
+ {
+ if ( ! isset($this->_field_data[$field]))
+ {
+ return $default;
+ }
+
+ 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
+ *
+ * @access public
+ * @param string
+ * @param string
+ * @return string
+ */
+ function set_select($field = '', $value = '', $default = FALSE)
+ {
+ if ( ! isset($this->_field_data[$field]) OR ! isset($this->_field_data[$field]['postdata']))
+ {
+ if ($default === TRUE AND count($this->_field_data) === 0)
+ {
+ return ' selected="selected"';
+ }
+ return '';
+ }
+
+ $field = $this->_field_data[$field]['postdata'];
+
+ if (is_array($field))
+ {
+ if ( ! in_array($value, $field, TRUE))
+ {
+ return '';
+ }
+ }
+ else
+ {
+ if (($field == '' OR $value == '') OR ($field != $value))
+ {
+ return '';
+ }
+ }
+
+ return ' selected="selected"';
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Radio
+ *
+ * Enables radio buttons to be set to the value the user
+ * selected in the event of an error
+ *
+ * @access public
+ * @param string
+ * @param string
+ * @return string
+ */
+ function set_radio($field = '', $value = '', $default = FALSE)
+ {
+ if ( ! isset($this->_field_data[$field]) OR ! isset($this->_field_data[$field]['postdata']))
+ {
+ if ($default === TRUE AND count($this->_field_data) === 0)
+ {
+ return ' checked="checked"';
+ }
+ return '';
+ }
+
+ $field = $this->_field_data[$field]['postdata'];
+
+ if (is_array($field))
+ {
+ if ( ! in_array($value, $field, TRUE))
+ {
+ return '';
+ }
+ }
+ else
+ {
+ if (($field == '' OR $value == '') OR ($field != $value))
+ {
+ return '';
+ }
+ }
+
+ return ' checked="checked"';
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Set Checkbox
+ *
+ * Enables checkboxes to be set to the value the user
+ * selected in the event of an error
+ *
+ * @access public
+ * @param string
+ * @param string
+ * @return string
+ */
+ function set_checkbox($field = '', $value = '', $default = FALSE)
+ {
+ if ( ! isset($this->_field_data[$field]) OR ! isset($this->_field_data[$field]['postdata']))
+ {
+ if ($default === TRUE AND count($this->_field_data) === 0)
+ {
+ return ' checked="checked"';
+ }
+ return '';
+ }
+
+ $field = $this->_field_data[$field]['postdata'];
+
+ if (is_array($field))
+ {
+ if ( ! in_array($value, $field, TRUE))
+ {
+ return '';
+ }
+ }
+ else
+ {
+ if (($field == '' OR $value == '') OR ($field != $value))
+ {
+ return '';
+ }
+ }
+
+ return ' checked="checked"';
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Required
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function required($str)
+ {
+ if ( ! is_array($str))
+ {
+ return (trim($str) == '') ? FALSE : TRUE;
+ }
+ else
+ {
+ return ( ! empty($str));
+ }
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Match one field to another
+ *
+ * @access public
+ * @param string
+ * @param field
+ * @return bool
+ */
+ function matches($str, $field)
+ {
+ if ( ! isset($_POST[$field]))
+ {
+ return FALSE;
+ }
+
+ $field = $_POST[$field];
+
+ return ($str !== $field) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Minimum Length
+ *
+ * @access public
+ * @param string
+ * @param value
+ * @return bool
+ */
+ function min_length($str, $val)
+ {
+ if (preg_match("/[^0-9]/", $val))
+ {
+ return FALSE;
+ }
+
+ return (strlen($str) < $val) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Max Length
+ *
+ * @access public
+ * @param string
+ * @param value
+ * @return bool
+ */
+ function max_length($str, $val)
+ {
+ if (preg_match("/[^0-9]/", $val))
+ {
+ return FALSE;
+ }
+
+ return (strlen($str) > $val) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Exact Length
+ *
+ * @access public
+ * @param string
+ * @param value
+ * @return bool
+ */
+ function exact_length($str, $val)
+ {
+ if (preg_match("/[^0-9]/", $val))
+ {
+ return FALSE;
+ }
+
+ return (strlen($str) != $val) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Valid Email
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function valid_email($str)
+ {
+ return ( ! preg_match("/^([a-z0-9\+_\-]+)(\.[a-z0-9\+_\-]+)*@([a-z0-9\-]+\.)+[a-z]{2,6}$/ix", $str)) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Valid Emails
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function valid_emails($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
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function valid_ip($ip)
+ {
+ return $this->CI->input->valid_ip($ip);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Alpha
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function alpha($str)
+ {
+ return ( ! preg_match("/^([a-z])+$/i", $str)) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Alpha-numeric
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function alpha_numeric($str)
+ {
+ return ( ! preg_match("/^([a-z0-9])+$/i", $str)) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Alpha-numeric with underscores and dashes
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function alpha_dash($str)
+ {
+ return ( ! preg_match("/^([-a-z0-9_-])+$/i", $str)) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Numeric
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function numeric($str)
+ {
+ return (bool)preg_match( '/^[\-+]?[0-9]*\.?[0-9]+$/', $str);
+
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Is Numeric
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function is_numeric($str)
+ {
+ return ( ! is_numeric($str)) ? FALSE : TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Integer
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function integer($str)
+ {
+ return (bool)preg_match( '/^[\-+]?[0-9]+$/', $str);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Is a Natural number (0,1,2,3, etc.)
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function is_natural($str)
+ {
+ return (bool)preg_match( '/^[0-9]+$/', $str);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Is a Natural number, but not a zero (1,2,3, etc.)
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function is_natural_no_zero($str)
+ {
+ if ( ! preg_match( '/^[0-9]+$/', $str))
+ {
+ return FALSE;
+ }
+
+ if ($str == 0)
+ {
+ return FALSE;
+ }
+
+ return TRUE;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Valid Base64
+ *
+ * Tests a string for characters outside of the Base64 alphabet
+ * as defined by RFC 2045 http://www.faqs.org/rfcs/rfc2045
+ *
+ * @access public
+ * @param string
+ * @return bool
+ */
+ function valid_base64($str)
+ {
+ return (bool) ! preg_match('/[^a-zA-Z0-9\/\+=]/', $str);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Prep data for form
+ *
+ * This function allows HTML to be safely shown in a form.
+ * Special characters are converted.
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function prep_for_form($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 $data;
+ }
+
+ return str_replace(array("'", '"', '<', '>'), array("'", """, '<', '>'), stripslashes($data));
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Prep URL
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function prep_url($str = '')
+ {
+ if ($str == 'http://' OR $str == '')
+ {
+ return '';
+ }
+
+ if (substr($str, 0, 7) != 'http://' && substr($str, 0, 8) != 'https://')
+ {
+ $str = 'http://'.$str;
+ }
+
+ return $str;
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Strip Image Tags
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function strip_image_tags($str)
+ {
+ return $this->CI->input->strip_image_tags($str);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * XSS Clean
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function xss_clean($str)
+ {
+ return $this->CI->input->xss_clean($str);
+ }
+
+ // --------------------------------------------------------------------
+
+ /**
+ * Convert PHP tags to entities
+ *
+ * @access public
+ * @param string
+ * @return string
+ */
+ function encode_php_tags($str)
+ {
+ return str_replace(array('<?php', '<?PHP', '<?', '?>'), array('<?php', '<?PHP', '<?', '?>'), $str);
+ }
+
+}
+// END Form Validation Class
+
+/* End of file Form_validation.php */
+/* Location: ./system/libraries/Form_validation.php */
\ No newline at end of file