php语言中使用json的技巧及json的实现代码详解

$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5);echo json_encode($arr);

$obj->body      = 'another post';$obj->id       = 21;$obj->approved    = true;$obj->favorite_count = 1;$obj->status     = NULL;echo json_encode($obj);

{　　　　"body":"another post",　　　　　"id":21,　　　　"approved":true,　　　　"favorite_count":1,　　　　"status":null}

$arr = Array('one', 'two', 'three');echo json_encode($arr);

$arr = Array('1'=>'one', '2'=>'two', '3'=>'three');echo json_encode($arr);

{"1":"one","2":"two","3":"three"}

json_encode( (object)$arr );

json_encode ( $arr, JSON_FORCE_OBJECT );

class Foo {　　　　const   ERROR_CODE = '404';　　　　public  $public_ex = 'this is public';　　　　private  $private_ex = 'this is private!';　　　　protected $protected_ex = 'this should be protected';　　　　public function getErrorCode() {　　　　　　return self::ERROR_CODE;　　　　}}

$foo = new Foo;$foo_json = json_encode($foo);echo $foo_json;

$json = '{"foo": 12345}';　　$obj = json_decode($json);　print $obj->{'foo'}; // 12345

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';　　var_dump(json_decode($json));

object(stdClass)#1 (5) {　　　　　　["a"] => int(1)　　　　["b"] => int(2)　　　　["c"] => int(3)　　　　["d"] => int(4)　　　　["e"] => int(5)　　}

$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}';var_dump(json_decode($json,true));

array(5) {　　　　 　　["a"] => int(1)　　 　　["b"] => int(2)　　 　　["c"] => int(3)　　 　　["d"] => int(4)　　 　　["e"] => int(5)　　}　

$bad_json = "{ 'bar': 'baz' }";$bad_json = '{ bar: "baz" }';　　$bad_json = '{ "bar": "baz", }';

var_dump(json_decode("Hello World")); //null

<?php /* * ****************************************************************************  * $base: $  *  * $Author: $  *   Berlin Qin  *  * $History: base.js $  *   Berlin Qin  //     created  *  * $contacted  *   webfmt@gmail.com  *   www.webfmt.com  *  * *************************************************************************** */ /* ===========================================================================  * license  *  * 、Open Source Licenses  * webfmt is distributed under the GPL, LGPL and MPL open source licenses.  * This triple copyleft licensing model avoids incompatibility with other open source licenses.  * These Open Source licenses are specially indicated for:  *  Integrating webfmt into Open Source software;  *  Personal and educational use of webfmt;  *  Integrating webfmt in commercial software,  * taking care of satisfying the Open Source licenses terms,  *  while not able or interested on supporting webfmt and its development.  *  * 、Commercial License  fbis source Closed Distribution License - CDL  * For many companies and products, Open Source licenses are not an option.  * This is why the fbis source Closed Distribution License (CDL) has been introduced.  * It is a non-copyleft license which gives companies complete freedom  * when integrating webfmt into their products and web sites.  * This license offers a very flexible way to integrate webfmt in your commercial application.  * These are the main advantages it offers over an Open Source license:  *   Modifications and enhancements doesn't need to be released under an Open Source license;  *   There is no need to distribute any Open Source license terms alongside with your product  * and no reference to it have to be done;  *   No references to webfmt have to be done in any file distributed with your product;  *   The source code of webfmt doesn't have to be distributed alongside with your product;  *   You can remove any file from webfmt when integrating it with your product.  * The CDL is a lifetime license valid for all releases of webfmt published during  * and before the year following its purchase.  * It's valid for webfmt releases also. It includes year of personal e-mail support.  *  * ************************************************************************************************************************************************* */ function jsonDecode($json) {   $result = array();   try   {     if (PHP_VERSION_ID > )     {       $result = (array) json_decode($json);     }     else     {       $json = str_replace(array("////", "///""), array("&#;", "&#;"), $json);       $parts = preg_split("@(/"[^/"]*/")|([/[/]/{/},:])|/s@is", $json, -, PREG_SPLIT_NO_EMPTY | PREG_SPLIT_DELIM_CAPTURE);       foreach ($parts as $index => $part)       {         if (strlen($part) == )         {           switch ($part)           {             case "[":             case "{":               $parts[$index] = "array(";               break;             case "]":             case "}":               $parts[$index] = ")";               break;             case ":":               $parts[$index] = "=>";               break;             case ",":               break;             default:               break;           }         }       }       $json = str_replace(array("&#;", "&#;", "$"), array("////", "///"", "//$"), implode("", $parts));       $result = eval("return $json;");     }   }   catch (Exception $e)   {     $result = array("error" => $e->getCode());   }   return $result; } function valueTostr($val) {   if (is_string($val))    {     $val = str_replace('/"', "///"", $val);     $val = str_replace("//", "////", $val);     $val = str_replace("/", "///", $val);     $val = str_replace("/t", "//t", $val);     $val = str_replace("/n", "//n", $val);     $val = str_replace("/r", "//r", $val);     $val = str_replace("/b", "//b", $val);     $val = str_replace("/f", "//f", $val);     return '"' . $val . '"';   }   elseif (is_int($val))     return sprintf('%d', $val);   elseif (is_float($val))     return sprintf('%F', $val);   elseif (is_bool($val))     return ($val ? 'true' : 'false');   else     return 'null'; } function jsonEncode($arr) {   $result = "{}";   try   {     if (PHP_VERSION_ID > )     {       $result = json_encode($arr);     }     else     {       $parts = array();       $is_list = false;       if (!is_array($arr))       {         $arr = (array) $arr;       }       $end = count($arr) - ;       if (count($arr) > )       {         if (is_numeric(key($arr)))         {           $result = "[";            for ($i = ; $i < count($arr); $i++)           {             if (is_array($arr[$i]))             {               $result = $result . jsonEncode($arr[$i]);             }             else             {               $result = $result . valueTostr($arr[$i]);             }             if ($i != $end)             {               $result = $result . ",";             }           }           $result = $result . "]";         }         else         {           $result = "{";            $i = ;           foreach ($arr as $key => $value)           {             $result = $result . '"' . $key . '":';             if (is_array($value))             {               $result = $result . jsonEncode($value);             }             else             {               $result = $result . valueTostr($value);             }             if ($i != $end)             {               $result = $result . ",";             }             $i++;           }           $result = $result . "}";         }       }       else       {         $result = "[]";       }     }   }   catch (Exception $e)   {   }   return $result; } ?>