Viewing file:  compatibility_helper.php (12.69 KB) -rw-r--r--
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<?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) 2008 - 2010, EllisLab, Inc.
* @license http://codeigniter.com/user_guide/license.html
* @link http://codeigniter.com
* @since Version 1.0
* @filesource
*/
// ------------------------------------------------------------------------
/**
* CodeIgniter Compatibility Helpers
*
* This helper contains some functions based on the PEAR PHP_Compat library
* http://pear.php.net/package/PHP_Compat
*
* The PEAR compat library is a little bloated and the code doesn't harmonize
* well with CodeIgniter, so those functions have been refactored.
* We cheat a little and use CI's _exception_handler() to output our own PHP errors
* so that the behavior fully mimicks the PHP 5 counterparts. -- Derek Jones
*
* @package CodeIgniter
* @subpackage Helpers
* @category Helpers
* @author ExpressionEngine Dev Team
* @link http://codeigniter.com/user_guide/helpers/compatibility_helper.html
*/
// ------------------------------------------------------------------------
if ( ! defined('PHP_EOL'))
{
define('PHP_EOL', (DIRECTORY_SEPARATOR == '/') ? "\n" : "\r\n");
}
// ------------------------------------------------------------------------
/**
* file_put_contents()
*
* Writes a string to a file
* http://us.php.net/manual/en/function.file_put_contents.php
* argument 4, $context, not supported
*
* @access public
* @param string file name
* @param mixed data to be written
* @param int flags
* @return int length of written string
*/
if ( ! function_exists('file_put_contents'))
{
function file_put_contents($filename, $data, $flags = NULL)
{
if (is_scalar($data))
{
settype($data, 'STRING');
}
if ( ! is_string($data) && ! is_array($data) && ! is_resource($data))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'file_put_contents(): the 2nd parameter should be either a string or an array', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
// read stream if given a stream resource
if (is_resource($data))
{
if (get_resource_type($data) !== 'stream')
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'file_put_contents(): supplied resource is not a valid stream resource', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
$text = '';
while ( ! feof($data))
{
$text .= fread($data, 4096);
}
$data = $text;
unset($text);
}
// strings only please!
if (is_array($data))
{
$data = implode('', $data);
}
// Set the appropriate mode
if (($flags & 8) > 0) // 8 = FILE_APPEND flag
{
$mode = FOPEN_WRITE_CREATE;
}
else
{
$mode = FOPEN_WRITE_CREATE_DESTRUCTIVE;
}
// Check if we're using the include path
if (($flags & 1) > 0) // 1 = FILE_USE_INCLUDE_PATH flag
{
$use_include_path = TRUE;
}
else
{
$use_include_path = FALSE;
}
$fp = @fopen($filename, $mode, $use_include_path);
if ($fp === FALSE)
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'file_put_contents('.htmlentities($filename).') failed to open stream', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
if (($flags & LOCK_EX) > 0)
{
if ( ! flock($fp, LOCK_EX))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'file_put_contents('.htmlentities($filename).') unable to acquire an exclusive lock on file', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
}
// write it
if (($written = @fwrite($fp, $data)) === FALSE)
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'file_put_contents('.htmlentities($filename).') failed to write to '.htmlentities($filename), $backtrace[0]['file'], $backtrace[0]['line']);
}
// Close the handle
@fclose($fp);
// Return length
return $written;
}
}
// ------------------------------------------------------------------------
/**
* fputcsv()
*
* Format line as CSV and write to file pointer
* http://us.php.net/manual/en/function.fputcsv.php
*
* @access public
* @param resource file pointer
* @param array data to be written
* @param string delimiter
* @param string enclosure
* @return int length of written string
*/
if ( ! function_exists('fputcsv'))
{
function fputcsv($handle, $fields, $delimiter = ',', $enclosure = '"')
{
// Checking for a handle resource
if ( ! is_resource($handle))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'fputcsv() expects parameter 1 to be stream resource, '.gettype($handle).' given', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
// OK, it is a resource, but is it a stream?
if (get_resource_type($handle) !== 'stream')
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'fputcsv() expects parameter 1 to be stream resource, '.get_resource_type($handle).' given', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
// Checking for an array of fields
if ( ! is_array($fields))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'fputcsv() expects parameter 2 to be array, '.gettype($fields).' given', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
// validate delimiter
if (strlen($delimiter) > 1)
{
$delimiter = substr($delimiter, 0, 1);
$backtrace = debug_backtrace();
_exception_handler(E_NOTICE, 'fputcsv() delimiter must be one character long, "'.htmlentities($delimiter).'" used', $backtrace[0]['file'], $backtrace[0]['line']);
}
// validate enclosure
if (strlen($enclosure) > 1)
{
$enclosure = substr($enclosure, 0, 1);
$backtrace = debug_backtrace();
_exception_handler(E_NOTICE, 'fputcsv() enclosure must be one character long, "'.htmlentities($enclosure).'" used', $backtrace[0]['file'], $backtrace[0]['line']);
}
$out = '';
foreach ($fields as $cell)
{
$cell = str_replace($enclosure, $enclosure.$enclosure, $cell);
if (strpos($cell, $delimiter) !== FALSE OR strpos($cell, $enclosure) !== FALSE OR strpos($cell, "\n") !== FALSE)
{
$out .= $enclosure.$cell.$enclosure.$delimiter;
}
else
{
$out .= $cell.$delimiter;
}
}
$length = @fwrite($handle, substr($out, 0, -1)."\n");
return $length;
}
}
// ------------------------------------------------------------------------
/**
* stripos()
*
* Find position of first occurrence of a case-insensitive string
* http://us.php.net/manual/en/function.stripos.php
*
* @access public
* @param string haystack
* @param string needle
* @param int offset
* @return int numeric position of the first occurrence of needle in the haystack
*/
if ( ! function_exists('stripos'))
{
function stripos($haystack, $needle, $offset = NULL)
{
// Cast non string scalar values
if (is_scalar($haystack))
{
settype($haystack, 'STRING');
}
if ( ! is_string($haystack))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'stripos() expects parameter 1 to be string, '.gettype($haystack).' given', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
if ( ! is_scalar($needle))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'stripos() needle is not a string or an integer in '.$backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
if (is_float($offset))
{
$offset = (int)$offset;
}
if ( ! is_int($offset) && ! is_bool($offset) && ! is_null($offset))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'stripos() expects parameter 3 to be long, '.gettype($offset).' given', $backtrace[0]['file'], $backtrace[0]['line']);
return NULL;
}
return strpos(strtolower($haystack), strtolower($needle), $offset);
}
}
// ------------------------------------------------------------------------
/**
* str_ireplace()
*
* Find position of first occurrence of a case-insensitive string
* http://us.php.net/manual/en/function.str-ireplace.php
* (parameter 4, $count, is not supported as to do so in PHP 4 would make
* it a required parameter)
*
* @access public
* @param mixed search
* @param mixed replace
* @param mixed subject
* @return int numeric position of the first occurrence of needle in the haystack
*/
if ( ! function_exists('str_ireplace'))
{
function str_ireplace($search, $replace, $subject)
{
// Nothing to do here
if ($search === NULL OR $subject === NULL)
{
return $subject;
}
// Crazy arguments
if (is_scalar($search) && is_array($replace))
{
$backtrace = debug_backtrace();
if (is_object($replace))
{
show_error('Object of class '.get_class($replace).' could not be converted to string in '.$backtrace[0]['file'].' on line '.$backtrace[0]['line']);
}
else
{
_exception_handler(E_USER_NOTICE, 'Array to string conversion in '.$backtrace[0]['file'], $backtrace[0]['line']);
}
}
// Searching for an array
if (is_array($search))
{
// Replacing with an array
if (is_array($replace))
{
$search = array_values($search);
$replace = array_values($replace);
if (count($search) >= count($replace))
{
$replace = array_pad($replace, count($search), '');
}
else
{
$replace = array_slice($replace, 0, count($search));
}
}
else
{
// Replacing with a string all positions
$replace = array_fill(0, count($search), $replace);
}
}
else
{
//Searching for a string and replacing with a string.
$search = array((string)$search);
$replace = array((string)$replace);
}
// Prepare the search array
foreach ($search as $search_key => $search_value)
{
$search[$search_key] = '/'.preg_quote($search_value, '/').'/i';
}
// Prepare the replace array (escape backreferences)
foreach ($replace as $k => $v)
{
$replace[$k] = str_replace(array(chr(92), '$'), array(chr(92).chr(92), '\$'), $v);
}
// do the replacement
$result = preg_replace($search, $replace, (array)$subject);
// Check if subject was initially a string and return it as a string
if ( ! is_array($subject))
{
return current($result);
}
// Otherwise, just return the array
return $result;
}
}
// ------------------------------------------------------------------------
/**
* http_build_query()
*
* Generate URL-encoded query string
* http://us.php.net/manual/en/function.http-build-query.php
*
* @access public
* @param array form data
* @param string numeric prefix
* @param string argument separator
* @return string URL-encoded string
*/
if ( ! function_exists('http_build_query'))
{
function http_build_query($formdata, $numeric_prefix = NULL, $separator = NULL)
{
// Check the data
if ( ! is_array($formdata) && ! is_object($formdata))
{
$backtrace = debug_backtrace();
_exception_handler(E_USER_WARNING, 'http_build_query() Parameter 1 expected to be Array or Object. Incorrect value given', $backtrace[0]['file'], $backtrace[0]['line']);
return FALSE;
}
// Cast it as array
if (is_object($formdata))
{
$formdata = get_object_vars($formdata);
}
// If the array is empty, return NULL
if (empty($formdata))
{
return NULL;
}
// Argument separator
if ($separator === NULL)
{
$separator = ini_get('arg_separator.output');
if (strlen($separator) == 0)
{
$separator = '&';
}
}
// Start building the query
$tmp = array();
foreach ($formdata as $key => $val)
{
if ($val === NULL)
{
continue;
}
if (is_integer($key) && $numeric_prefix != NULL)
{
$key = $numeric_prefix.$key;
}
if (is_resource($val))
{
return NULL;
}
// hand it off to a recursive parser
$tmp[] = _http_build_query_helper($key, $val, $separator);
}
return implode($separator, $tmp);
}
// Helper helper. Remind anyone of college?
// Required to handle recursion in nested arrays.
//
// You could shave fractions of fractions of a second by moving where
// the urlencoding takes place, but it's much less intuitive, and if
// your application has 10,000 form fields, well, you have other problems ;)
function _http_build_query_helper($key, $val, $separator = '&')
{
if (is_scalar($val))
{
return urlencode($key).'='.urlencode($val);
}
else
{
// arrays please
if (is_object($val))
{
$val = get_object_vars($val);
}
foreach ($val as $k => $v)
{
$tmp[] = _http_build_query_helper($key.'['.$k.']', $v, $separator);
}
}
return implode($separator, $tmp);
}
}
/* End of file compatibility_helper.php */
/* Location: ./system/helpers/compatibility_helper.php */
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