<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');

/**

 * CodeIgniter

 *

 * An open source application development framework for PHP 5.1.6 or newer

 *

 * @package		CodeIgniter

 * @author		ExpressionEngine Dev Team

 * @copyright	Copyright (c) 2008 - 2011, 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

	 */

	public function __construct($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');



		// Set the character encoding in MB.

		if (function_exists('mb_internal_encoding'))

		{

			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

	 *

	 * @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 $this;

		}



		// 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 $this;

		}



		// 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?  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'				=> ''

		);



		return $this;

	}



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



	/**

	 * 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);



		return $this;

	}



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



	/**

	 * 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;



		return $this;

	}



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



	/**

	 * 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']) OR $this->_field_data[$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)

		{

			if ($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]) AND $_POST[$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

				{

					// 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

	 *

	 * @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

		$callback = FALSE;

		if ( ! in_array('required', $rules) AND is_null($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) AND $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]))

				{

					if (FALSE === ($line = $this->CI->lang->line($type)))

					{

						$line = 'The field was not set';

					}

				}

				else

				{

					$line = $this->_error_messages[$type];

				}



				// 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 ($row['is_array'] == TRUE AND is_array($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)

				{

					continue;

				}

			}

			else

			{

				if ( ! 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 = $rule($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);

					}



					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];

				}



				// 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]) AND isset($this->_field_data[$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

	 *

	 * @access	private

	 * @param	string	the field name

	 * @return	string

	 */

	function _translate_fieldname($fieldname)

	{

		// Do we need to translate the field name?

		// We look for the prefix lang: to determine this

		if (substr($fieldname, 0, 5) == 'lang:')

		{

			// 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

	 *

	 * @access	public

	 * @param	string	the field name

	 * @param	string

	 * @return	void

	 */

	function set_value($field = '', $default = '')

	{

		if ( ! isset($this->_field_data[$field]))

		{

			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

	 *

	 * @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))

			{

				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))

			{

				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))

			{

				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));

		}

	}



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



	/**

	 * Performs a Regular Expression match test.

	 *

	 * @access	public

	 * @param	string

	 * @param	regex

	 * @return	bool

	 */

	function regex_match($str, $regex)

	{

		if ( ! preg_match($regex, $str))

		{

			return FALSE;

		}



		return  TRUE;

	}



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



	/**

	 * 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;

		}



		if (function_exists('mb_strlen'))

		{

			return (mb_strlen($str) < $val) ? FALSE : TRUE;

		}



		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;

		}



		if (function_exists('mb_strlen'))

		{

			return (mb_strlen($str) > $val) ? FALSE : TRUE;

		}



		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;

		}



		if (function_exists('mb_strlen'))

		{

			return (mb_strlen($str) != $val) ? FALSE : TRUE;

		}



		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);

	}



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



	/**

	 * Decimal number

	 *

	 * @access	public

	 * @param	string

	 * @return	bool

	 */

	function decimal($str)

	{

		return (bool) preg_match('/^[\-+]?[0-9]+\.[0-9]+$/', $str);

	}



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



	/**

	 * Greather than

	 *

	 * @access	public

	 * @param	string

	 * @return	bool

	 */

	function greater_than($str, $min)

	{

		if ( ! is_numeric($str))

		{

			return FALSE;

		}

		return $str > $min;

	}



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



	/**

	 * Less than

	 *

	 * @access	public

	 * @param	string

	 * @return	bool

	 */

	function less_than($str, $max)

	{

		if ( ! is_numeric($str))

		{

			return FALSE;

		}

		return $str < $max;

	}



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



	/**

	 * 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("&#39;", "&quot;", '&lt;', '&gt;'), 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 $this->CI->security->xss_clean($str);

	}



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



	/**

	 * Convert PHP tags to entities

	 *

	 * @access	public

	 * @param	string

	 * @return	string

	 */

	function encode_php_tags($str)

	{

		return str_replace(array('<?php', '<?PHP', '<?', '?>'),  array('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;'), $str);

	}



}

// END Form Validation Class



/* End of file Form_validation.php */

/* Location: ./system/libraries/Form_validation.php */

