<?php

/**

 * WordPress implementation for PHP functions missing from older PHP versions.

 *

 * @package PHP

 * @access private

 */

// Added in PHP 5.0

if (!function_exists('http_build_query')) {

	function http_build_query($data, $prefix=null, $sep=null) {

		return _http_build_query($data, $prefix, $sep);

	}

}

// from php.net (modified by Mark Jaquith to behave like the native PHP5 function)

function _http_build_query($data, $prefix=null, $sep=null, $key='', $urlencode=true) {

	$ret = array();

	foreach ( (array) $data as $k => $v ) {

		if ( $urlencode)

			$k = urlencode($k);

		if ( is_int($k) && $prefix != null )

			$k = $prefix.$k;

		if ( !empty($key) )

			$k = $key . '%5B' . $k . '%5D';

		if ( $v === NULL )

			continue;

		elseif ( $v === FALSE )

			$v = '0';

		if ( is_array($v) || is_object($v) )

			array_push($ret,_http_build_query($v, '', $sep, $k, $urlencode));

		elseif ( $urlencode )

			array_push($ret, $k.'='.urlencode($v));

		else

			array_push($ret, $k.'='.$v);

	}

	if ( NULL === $sep )

		$sep = ini_get('arg_separator.output');

	return implode($sep, $ret);

}

if ( !function_exists('_') ) {

	function _($string) {

		return $string;

	}

}

if (!function_exists('stripos')) {

	function stripos($haystack, $needle, $offset = 0) {

		return strpos(strtolower($haystack), strtolower($needle), $offset);

	}

}

if ( !function_exists('hash_hmac') ):

function hash_hmac($algo, $data, $key, $raw_output = false) {

	return _hash_hmac($algo, $data, $key, $raw_output);

}

endif;

function _hash_hmac($algo, $data, $key, $raw_output = false) {

	$packs = array('md5' => 'H32', 'sha1' => 'H40');

	if ( !isset($packs[$algo]) )

		return false;

	$pack = $packs[$algo];

	if (strlen($key) > 64)

		$key = pack($pack, $algo($key));

	$key = str_pad($key, 64, chr(0));

	$ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64));

	$opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64));

	$hmac = $algo($opad . pack($pack, $algo($ipad . $data)));

	if ( $raw_output )

		return pack( $pack, $hmac );

	return $hmac;

}

if ( !function_exists('mb_substr') ):

	function mb_substr( $str, $start, $length=null, $encoding=null ) {

		return _mb_substr($str, $start, $length, $encoding);

	}

endif;

function _mb_substr( $str, $start, $length=null, $encoding=null ) {

	// the solution below, works only for utf-8, so in case of a different

	// charset, just use built-in substr

	$charset = get_option( 'blog_charset' );

	if ( !in_array( $charset, array('utf8', 'utf-8', 'UTF8', 'UTF-8') ) ) {

		return is_null( $length )? substr( $str, $start ) : substr( $str, $start, $length);

	}

	// use the regex unicode support to separate the UTF-8 characters into an array

	preg_match_all( '/./us', $str, $match );

	$chars = is_null( $length )? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );

	return implode( '', $chars );

}

if ( !function_exists( 'htmlspecialchars_decode' ) ) {

	// Added in PHP 5.1.0

	// Error checks from PEAR::PHP_Compat

	function htmlspecialchars_decode( $string, $quote_style = ENT_COMPAT )

	{

		if ( !is_scalar( $string ) ) {

			trigger_error( 'htmlspecialchars_decode() expects parameter 1 to be string, ' . gettype( $string ) . ' given', E_USER_WARNING );

			return;

		}

		if ( !is_int( $quote_style ) && $quote_style !== null ) {

			trigger_error( 'htmlspecialchars_decode() expects parameter 2 to be integer, ' . gettype( $quote_style ) . ' given', E_USER_WARNING );

			return;

		}

		return wp_specialchars_decode( $string, $quote_style );

	}

}

// For PHP < 5.2.0

if ( !function_exists('json_encode') ) {

	function json_encode( $string ) {

		global $wp_json;

		if ( !is_a($wp_json, 'Services_JSON') ) {

			require_once( 'class-json.php' );

			$wp_json = new Services_JSON();

		}

		return $wp_json->encodeUnsafe( $string );

	}

}

if ( !function_exists('json_decode') ) {

	function json_decode( $string ) {

		global $wp_json;

		if ( !is_a($wp_json, 'Services_JSON') ) {

			require_once( 'class-json.php' );

			$wp_json = new Services_JSON();

		}

		return $wp_json->decode( $string );

	}

}

// pathinfo that fills 'filename' without extension like in PHP 5.2+

function pathinfo52($path) {

	$parts = pathinfo($path);

	if ( !isset($parts['filename']) ) {

		$parts['filename'] = substr( $parts['basename'], 0, strrpos($parts['basename'], '.') );

		if ( empty($parts['filename']) ) // there's no extension

			$parts['filename'] = $parts['basename'];

	}

	return $parts;

}