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] => ) )

结果： 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,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
<div class="codetitle"><a style="CURSOR: pointer" data="91022" class="copybut" id="copybut91022" onclick="doCopy('code91022')"> 代码如下:

PHP $a = array('',"'bar'",'"baz"','&blong&',"\xc3\xa9");

echo "Normal: ",json_encode($a),"\n";
echo "Tags: ",json_encode($a,JSON_HEX_TAG),"\n";
echo "Apos: ",JSON_HEX_APOS),"\n";
echo "Quot: ",JSON_HEX_QUOT),"\n";
echo "Amp: ",JSON_HEX_AMP),"\n";
echo "Unicode: ",JSON_UNESCAPED_UNICODE),"\n";
echo "All: ",JSON_HEX_TAG | JSON_HEX_APOS | JSON_HEX_QUOT | JSON_HEX_AMP | JSON_UNESCAPED_UNICODE),"\n\n";

$b = array();

echo "Empty array output as array: ",json_encode($b),"\n";
echo "Empty array output as object: ",json_encode($b,JSON_FORCE_OBJECT),"\n\n";

$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,"\n\n";

$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,"\n\n";
?>

","\"baz\"","&blong&","\u00e9"] Tags: ["\u003Cfoo\u003E","\u00e9"] Apos: ["","\u0027bar\u0027","\u00e9"] Quot: ["","\u0022baz\u0022","\u00e9"] Amp: ["","\u0026blong\u0026","\u00e9"] Unicode: ["","é"] All: ["\u003Cfoo\u003E","é"]

Empty array output as array: []
Empty array output as object: {}

Non-associative array output as array: [[1,3]]
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"}

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)
);
?>

string(3) "foo" [1]=> string(3) "bar" [2]=> string(3) "baz" [3]=> string(5) "blong" } string(27) "["foo","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"}"

Name= 'a1';$obj->Number ='123'; $obj->Contno= '000'; echo json_encode($obj);

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。

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原文链接：https://www.f2er.com/php/27170.html