奥门新浦京官方网站php中json_decode的使用方法_php技巧_脚本之家

json_decode对JSON格式的字符串进行编码而json_encode对变量进行 JSON
编码,需要的朋友可以参考下。

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 复制代码 代码如下: 上例将输出:
复制代码 代码如下: object { [“a”] =>
int [“c”] => int [“e”] => int { [“a”] => int [“c”]
=> int [“e”] => int } 复制代码
代码如下:
$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; 结果为: 复制代码
代码如下: 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试下
复制代码 代码如下: echo json_decode;
结果: 复制代码 代码如下: 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输出的一个关联数组,由此可知json_decode输出的是对象,而json_decode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 $options = 0 ] ) 返回 value 值的
JSON 形式 Report a bug 参数 value 待编码的 value ,除了resource
类型之外,可以为任何数据类型 该函数只能接受 UTF-8 编码的数据 options
由以下常量组成的二进制掩码: JSON_HEX_QUOT, JSON_HEX_TAG,
JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK,
JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, JSON_FORCE_OBJECT,
JSON_UNESCAPED_UNICODE. Report a bug 返回值 编码成功则返回一个以 JSON
形式表示的 string 或者在失败时返回 FALSE 。 Report a bug 更新日志 版本
说明 5.4.0 options 参数增加常量: JSON_PRETTY_PRINT,
JSON_UNESCAPED_SLASHES, 和 JSON_UNESCAPED_UNICODE。 5.3.3 options
参数增加常量:JSON_NUMERIC_CHECK。 5.3.0 增加 options 参数. Report a
bug 范例 Example #1 A json_encode() 的例子 复制代码 代码如下:
1,’b’=>2,’c’=>3,’d’=>4,’e’=>5); echo json_encode; ?>
以上例程会输出: 复制代码 代码如下:
{“a”:1,”b”:2,”c”:3,”d”:4,”e”:5} Example #2 json_encode() 函数中
options 参数的用法 复制代码 代码如下:
‘,”‘bar'”,'”baz”‘,’&blong&’, “xc3xa9”); echo “Normal: “,
json_encode, “n”; echo “Tags: “, json_encode, “n”; echo “Apos: “,
json_encode, “n”; echo “Quot: “, json_encode, “n”; echo “Amp: “,
json_encode, “n”; echo “Unicode: “, json_encode($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”; $b = array(); echo “Empty array
output as array: “, json_encode, “n”; echo “Empty array output as
object: “, json_encode($b, JSON_FORCE_OBJECT), “nn”; $c = array;
echo “Non-associative array output as array: “, json_encode, “n”;
echo “Non-associative array output as object: “, json_encode($c,
JSON_FORCE_OBJECT), “nn”; $d = array(‘foo’ => ‘bar’, ‘baz’
=> ‘long’); echo “Associative array always output as object: “,
json_encode, “n”; echo “Associative array always output as object: “,
json_encode($d, JSON_FORCE_OBJECT), “nn”; ?> 以上例程会输出:
复制代码 代码如下: 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 复制代码 代码如下:
“foo”, 2=>”bar”, 3=>”baz”, 4=>”blong”); var_dump(
$nonsequential, json_encode; 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;
var_dump( $sequential, json_encode; ?> 以上例程会输出: 复制代码 代码如下: 连续数组 array “foo”
[1]=> string “bar” [2]=> string “baz” [3]=> string
“blong” } string “[“foo”,”bar”,”baz”,”blong”]” 非连续数组 array “foo”
[2]=> string “bar” [3]=> string “baz” [4]=> string
“blong” } string “{“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 “foo” [2]=> string
“baz” [3]=> string “blong” } string
“{“0″:”foo”,”2″:”baz”,”3″:”blong”}” 复制代码 代码如下: $obj->Name=
‘a1′;$obj->Number =’123’; $obj->Contno= ‘000’; echo json_encode;
结果为: 复制代码 代码如下: {“Name”:”a1″,
“Number”:”123″, “Contno”:”000″ }
可以看出json_encode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。

1.json_decode()

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

在线JSON代码检验、检验、美化、格式化工具:

json_decode — 对 JSON 格式的字符串进行编码

在线XML/JSON互相转换:

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

json代码在线格式化/美化/压缩/编辑/转换工具:

参数

C语言风格/HTML/CSS/json代码格式化美化工具:

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

<?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) 
}

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

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

<?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&', "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: ["<foo>","'bar'",""baz"","&blong&","u00e9"] 
Tags: ["u003Cfoou003E","'bar'",""baz"","&blong&","u00e9"] 
Apos: ["<foo>","u0027baru0027",""baz"","&blong&","u00e9"] 
Quot: ["<foo>","'bar'","u0022bazu0022","&blong&","u00e9"] 
Amp: ["<foo>","'bar'",""baz"","u0026blongu0026","u00e9"] 
Unicode: ["<foo>","'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

<?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"}"

$obj->Name= 'a1';$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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