<?php
/******************************************************************
* Projectname: PHP JSON-P Class
* Version: 1.0
* Author: Radovan Janjic <rade@it-radionica.com>
* Last modified: 10 05 2013
* Copyright (C): 2013 IT-radionica.com, All Rights Reserved
* Project: https://github.com/uzi88/PHP_JSONP_Response
*
* GNU General Public License (Version 2, June 1991)
*
* This program is free software; you can redistribute
* it and/or modify it under the terms of the GNU
* General Public License as published by the Free
* Software Foundation; either version 2 of the License,
* or (at your option) any later version.
*
* This program is distributed in the hope that it will
* be useful, but WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*
* Description:
*
* JSONP or "JSON with padding" is a communication technique
* used in JavaScript programs which run in Web browsers.
* It provides a method to request data from a server in a different domain,
* something prohibited by typical web browsers because of the same origin policy.
* Read more on:
* http://en.wikipedia.org/wiki/JSONP
*
* Example:
*
* $JSONP = new JSONP;
* $JSONP->encode(array('asdf', 'asfd'));
*
******************************************************************/
class JSONP {
/** Javascript callback function name
* @var string
*/
var $paramCallback = 'callback';
/** Javascript assinged variable name
* @var string
*/
var $paramAssign = 'assing';
/** Javascript variable name REGEX
* @var string
*/
var $jsVarName = '/^[\p{L}\p{Nl}$_][\p{L}\p{Nl}$\p{Mn}\p{Mc}\p{Nd}\p{Pc}]*$/i';
/** Javascript function name REGEX
* @var string
*/
var $jsFuncName = '/^[$A-Z_][0-9A-Z_\.$]*$/i';
/** JSON-P encode and print with headers
* @param mixed $data
* @param boolean $print
* @param boolean $header
* @return JSON-P formated string
*/
function encode($data, $print = TRUE, $header = TRUE) {
// Define json_encode for PHP < 5.2
if (!function_exists('json_encode')) {
function json_encode($data) {
switch ($type = gettype($data)) {
case 'NULL':
return 'null';
case 'boolean':
return ($data ? 'true' : 'false');
case 'integer':
case 'double':
case 'float':
return $data;
case 'string':
return '"' . addslashes($data) . '"';
case 'object':
return json_encode(get_object_vars($data));
case 'array':
$output_index_count = 0;
$output_indexed = $output_associative = array();
foreach ($data as $key => $value) {
$output_indexed[] = json_encode($value);
$output_associative[] = json_encode($key) . ':' . json_encode($value);
if ($output_index_count !== NULL && $output_index_count++ !== $key) {
$output_index_count = NULL;
}
}
return ($output_index_count !== NULL) ? '[' . implode(',', $output_indexed) . ']' : '{' . implode(',', $output_associative) . '}';
default:
return NULL;
}
}
}
$return = NULL;
$jsonp = TRUE;
if(isset($_GET[$this->paramCallback]) && @preg_match($this->jsFuncName, $_GET[$this->paramCallback], $callback)) {
$return = $callback[0]. '(' . json_encode($data) . ');';
} else {
if (isset($_GET[$this->paramAssign]) && @preg_match($this->jsVarName, $_GET[$this->paramAssign], $assign)) {
$return = 'var ' . $assign[0] . ' = ' . json_encode($data) . ';';
} else {
$jsonp = FALSE;
$return = json_encode($data);
}
}
if ($print) {
if ($header) {
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", FALSE);
header("Pragma: no-cache");
header("Content-Type: application/" . ($jsonp ? "javascript" : "json"));
}
echo $return;
} else {
return $return;
}
}
}
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