php中json_decode()和json_encode()用法与中文不显示解决办法

本文章介绍了关于php中json_decode()和json_encode()用法与中文不显示解决办法，有需要的朋友可以参考一下下。

php中json_decode()和json_encode()

1.json_decode()

json_decode
(PHP 5 >= 5.2.0, PECL json >= 1.2.0)

json_decode — 对 JSON 格式的字符串进行编码

说明
mixed json_decode ( string $json [, bool $assoc ] )
接受一个 JSON 格式的字符串并且把它转换为 PHP 变量

参数

json
待解码的 json string 格式的字符串。

assoc
当该参数为 TRUE 时，将返回 array 而非 object 。

返回值
Returns an object or if the optional assoc parameter is TRUE, an associative array is instead returned.

范例

Example #1 json_decode() 的例子

代码如下

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$json = '{"a":1,"b":2,"c":3,"d":4,"e":5}'; var_dump(json_decode($json)); var_dump(json_decode($json, true)); ?> 上例将输出： object(stdClass)#1 (5) { ["a"] => int(1) ["b"] => int(2) ["c"] => int(3) ["d"] => int(4) ["e"] => int(5) } array(5) { ["a"] => int(1) ["b"] => int(2) ["c"] => int(3) ["d"] => int(4) ["e"] => int(5) } $data='[{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""},{"Name":"a1","Number":"123","Contno":"000","QQNo":""}]'; echo json_decode($data); 结果为： Array ( [0] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => stdClass Object ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )

可以看出经过json_decode()编译出来的是对象,现在输出json_decode($data,true)试下

代码如下	复制代码
echo json_decode($data,true); 结果： Array ( [0] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [1] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) [2] => Array ( [Name] => a1 [Number] => 123 [Contno] => 000 [QQNo] => ) )

可以看出 json_decode($data,true)输出的一个关联数组,由此可知json_decode($data）输出的是对象,而json_decode("$arr",true)是把它强制生成PHP关联数组.

2.json_encode()

json_encode
(PHP 5 >= 5.2.0, PECL json >= 1.2.0)

json_encode — 对变量进行 JSON 编码

Report a bug 说明
string json_encode ( mixed $value [, int $options = 0 ] )
返回 value 值的 JSON 形式

Report a bug 参数

value
待编码的 value ，除了resource 类型之外，可以为任何数据类型

该函数只能接受 UTF-8 编码的数据

options
由以下常量组成的二进制掩码： JSON_HEX_QUOT, JSON_HEX_TAG, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT, JSON_UNESCAPED_UNICODE.

Report a bug 返回值
编码成功则返回一个以 JSON 形式表示的 string 或者在失败时返回 FALSE 。

Report a bug 更新日志
版本 说明
5.4.0 options 参数增加常量： JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, 和 JSON_UNESCAPED_UNICODE。
5.3.3 options 参数增加常量：JSON_NUMERIC_CHECK。
5.3.0 增加 options 参数.

Report a bug 范例

Example #1 A json_encode() 的例子

代码如下

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$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5); echo json_encode($arr); ?> 以上例程会输出： {"a":1,"b":2,"c":3,"d":4,"e":5} Example #2 json_encode() 函数中 options 参数的用法 $a = array('',"'bar'",'"baz"','&blong&', "xc3xa9"); echo "Normal: ", json_encode($a), "n"; echo "Tags: ", json_encode($a, JSON_HEX_TAG), "n"; echo "Apos: ", json_encode($a, JSON_HEX_APOS), "n"; echo "Quot: ", json_encode($a, JSON_HEX_QUOT), "n"; echo "Amp: ", json_encode($a, JSON_HEX_AMP), "n"; echo "Unicode: ", json_encode($a, JSON_UNESCAPED_UNICODE), "n"; echo "All: ", json_encode($a, JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE), "nn"; $b = array(); echo "Empty array output as array: ", json_encode($b), "n"; echo "Empty array output as object: ", json_encode($b, JSON_FORCE_OBJECT), "nn"; $c = array(array(1,2,3)); echo "Non-associative array output as array: ", json_encode($c), "n"; echo "Non-associative array output as object: ", json_encode($c, JSON_FORCE_OBJECT), "nn"; $d = array('foo' => 'bar', 'baz' => 'long'); echo "Associative array always output as object: ", json_encode($d), "n"; echo "Associative array always output as object: ", json_encode($d, JSON_FORCE_OBJECT), "nn"; ?> 以上例程会输出： Normal: ["","'bar'",""baz"","&blong&","u00e9"] Tags: ["u003Cfoou003E","'bar'",""baz"","&blong&","u00e9"] Apos: ["","u0027baru0027",""baz"","&blong&","u00e9"] Quot: ["","'bar'","u0022bazu0022","&blong&","u00e9"] Amp: ["","'bar'",""baz"","u0026blongu0026","u00e9"] Unicode: ["","'bar'",""baz"","&blong&","é"] All: ["u003Cfoou003E","u0027baru0027","u0022bazu0022","u0026blongu0026","é"] Empty array output as array: [] Empty array output as object: {} Non-associative array output as array: [[1,2,3]] Non-associative array output as object: {"0":{"0":1,"1":2,"2":3}} Associative array always output as object: {"foo":"bar","baz":"long"} Associative array always output as object: {"foo":"bar","baz":"long"}

Example #3 连续与非连续数组示例

代码如下	复制代码
echo "连续数组".PHP_EOL; $sequential = array("foo", "bar", "baz", "blong"); var_dump( $sequential, json_encode($sequential) ); echo PHP_EOL."非连续数组".PHP_EOL; $nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong"); var_dump( $nonsequential, json_encode($nonsequential) ); echo PHP_EOL."删除一个连续数组值的方式产生的非连续数组".PHP_EOL; unset($sequential[1]); var_dump( $sequential, json_encode($sequential) ); ?>

以上例程会输出：

代码如下

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连续数组 array(4) { [0]=> string(3) "foo" [1]=> string(3) "bar" [2]=> string(3) "baz" [3]=> string(5) "blong" } string(27) "["foo","bar","baz","blong"]" 非连续数组 array(4) { [1]=> string(3) "foo" [2]=> string(3) "bar" [3]=> string(3) "baz" [4]=> string(5) "blong" } string(43) "{"1":"foo","2":"bar","3":"baz","4":"blong"}" 删除一个连续数组值的方式产生的非连续数组 array(3) { [0]=> string(3) "foo" [2]=> string(3) "baz" [3]=> string(5) "blong" } string(33) "{"0":"foo","2":"baz","3":"blong"}" $obj->Name= 'a1';$obj->Number ='123'; $obj->Contno= '000'; echo json_encode($obj); 结果为： {"Name":"a1", "Number":"123", "Contno":"000" }

可以看出json_encode()和json_decode()是编译和反编译过程，注意json只接受utf-8编码的字符，所以json_encode()的参数必须是utf-8编码，否则会得到空字符或者null

如果是中文的话就要注意了

在网上找到一种解决方法：

代码如下	复制代码
/* 处理json_encode中文乱码 */ $data = array ('game' => '冰火国度', 'name' => '刺之灵', 'country' => '冰霜国', 'level' => 45 ); echo json_encode ( $data ); echo " "; $newData = array (); foreach ( $data as $key => $value ) { $newData [$key] = urlencode ( $value ); } echo urldecode ( json_encode ( $newData ) ); ?>

后来请教了别人，还可以用base64编码，不过base64编码不可以放在URL中，百度是这样解释的：

标准的Base64并不适合直接放在URL里传输，因为URL编码器会把标准Base64中的“/”和“+”字符变为形如“%XX”的形式，而这些“%”号在存入数据库时还需要再进行转换，因为ANSI SQL中已将“%”号用作通配符。

不过我的数据是要通过POST发送的，并不在HTTP 的head中，而在message-body里，所以不受影响。

json_encode 只能接受utf-8格式的数据

例如：'胥'经过json_encode处理后变为'u80e5'，最终的json中中文部分被替换为unicode编码。我们要解决的就是将对象转换为json并保证对象内部的中文在json中仍然是以正常的中文出现，现在看来只使用json_encode是不能达到目的的。
　　我的解决方法：先将类中的中文字段进行url编码（urlencode），然后再对对象进行json编码（jsonencode），最后url解码（urldecode）json，即最终的json，里面的中文依旧是那个中文！
测试代码如下：

代码如下

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class myClass { public $item1 = 1; public $item2 = '中文'; function to_json() { //url编码,避免json_encode将中文转为unicode $this->item2 = urlencode($this->item2); $str_json = json_encode($this); //url解码,转完json后将各属性返回,确保对象属性不变 $this->item2 = urldecode($this->item2); return urldecode($str_json); } } $c = new myClass(); echo json_encode($c); echo ' '; echo $c->to_json(); echo ' '; echo json_encode($c); echo ' '; echo json_encode('胥'); ?> 程序输出结果： {"item1":1,"item2":"u4e2du6587"} {"item1":1,"item2":"中文"} {"item1":1,"item2":"u4e2du6587"} "u80e5"