php中json_decode()和json_encode()的使用方法

本文介绍PHP中json_encode和json_decode函数的基本使用方法,包括如何将PHP变量编码为JSON格式,以及如何将JSON格式的字符串解码为PHP变量。

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1.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 1
Example #1 json_decode() 的例子 

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


范例 2
Example #2 json_decode() 的例子 

$data='[
	{"Name":"a1","Number":"123","Contno":"000","QQNo":""},
	{"Name":"a1","Number":"123","Contno":"000","QQNo":""},
	{"Name":"a1","Number":"123","Contno":"000","QQNo":""}
];
echo json_decode($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object,

现在加参数 ,转换输出关联数组

json_decode($data,true)

$data='[
	{"Name":"a1","Number":"123","Contno":"000","QQNo":""},
	{"Name":"a1","Number":"123","Contno":"000","QQNo":""},
	{"Name":"a1","Number":"123","Contno":"000","QQNo":""}
];
echo json_decode($data,true); 

输出结果:

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()  (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 


参数说明 
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.

Example #1 A json_encode() 的例子 

<?php 
	$arr = array ('a'=>1,'b'=>2,'c'=>3,'d'=>4,'e'=>5); 
	echo json_encode($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 
<?php 
$a = array('<foo>',"'bar'",'"baz"','&blong&', "\xc3\xa9"); 

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), "\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, JSON_FORCE_OBJECT), "\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, JSON_FORCE_OBJECT), "\n\n"; 
?> 
以上例程会输出: 
Normal: ["<foo>","'bar'","\"baz\"","&blong&","\u00e9"] 
Tags: ["\u003Cfoo\u003E","'bar'","\"baz\"","&blong&","\u00e9"] 
Apos: ["<foo>","\u0027bar\u0027","\"baz\"","&blong&","\u00e9"] 
Quot: ["<foo>","'bar'","\u0022baz\u0022","&blong&","\u00e9"] 
Amp: ["<foo>","'bar'","\"baz\"","\u0026blong\u0026","\u00e9"] 
Unicode: ["<foo>","'bar'","\"baz\"","&blong&","é"] 
All: ["\u003Cfoo\u003E","\u0027bar\u0027","\u0022baz\u0022","\u0026blong\u0026","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 
<?php 
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:


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"}" 

Example #4

$obj->Name= 'a1';$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。






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