Usage of json_decode() and json_encode() in php and solution for Chinese not showing

This article introduces the usage of json_decode() and json_encode() in php and the solution for not displaying Chinese characters. Friends in need can refer to it.

json_decode() and json_encode() in php

1.json_decode()

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

json_decode — Encode a JSON-formatted string

Description
mixed json_decode ( string $json [, bool $assoc ] )
Accepts a JSON formatted string and converts it into a PHP variable

Parameters

json
The string in json string format to be decoded.

assoc
When this parameter is TRUE, an array is returned instead of an object.

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

Example

Example #1 Example of json_decode()

The code is as follows

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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] => ) )

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

var_dump(json_decode($json));

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] => ) )

var_dump(json_decode($json, true)); ?> The above example will output: 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); The result is: 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] => ) ) It can be seen that the object compiled by json_decode() is an object. Now try to output json_decode($data,true)

The code is as follows	Copy code
echo json_decode($data,true); Result: 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] => ) )

You can see that json_decode($data,true) outputs an associative array. From this, we can see that json_decode($data) outputs an object, and json_decode("$arr",true) forces it to generate a PHP associative array. .

2.json_encode()

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

json_encode — JSON encode variables

Report a bug Description
string json_encode ( mixed $value [, int $options = 0 ] )
Returns the JSON form of value

Report a bug parameter

value
The value to be encoded can be any data type except resource type

This function can only accept UTF-8 encoded data

options
Binary mask consisting of the following constants: 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 return value
Returns a string representation in JSON format on success or FALSE on failure.

Report a bug update log
Version Description
5.4.0 options parameter adds constants: JSON_PRETTY_PRINT, JSON_UNESCAPED_SLASHES, and JSON_UNESCAPED_UNICODE.
5.3.3 The options parameter adds a constant: JSON_NUMERIC_CHECK.
5.3.0 Add options parameter.

Report a bug Example

Example #1 A json_encode() example

The code is as follows

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

echo json_encode($arr);
?>

The above routine will output:

{"a":1,"b":2,"c":3,"d":4,"e":5}

Example #2 Usage of options parameter in json_encode() function

$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";
?>

The above routine will output:

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 Example of continuous and non-continuous arrays

The code is as follows

代码如下

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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)
);
?>

Copy code

代码如下

复制代码

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"
}

echo "continuous array".PHP_EOL;

$sequential = array("foo", "bar", "baz", "blong");

var_dump(
$sequential,

json_encode($sequential)

);

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 ) ); ?>

echo PHP_EOL."non-continuous array".PHP_EOL; $nonsequential = array(1=>"foo", 2=>"bar", 3=>"baz", 4=>"blong"); var_dump( $nonsequential, json_encode($nonsequential) ); echo PHP_EOL."A non-continuous array generated by deleting a continuous array value".PHP_EOL; unset($sequential[1]); var_dump( $sequential, json_encode($sequential) ); ?> The above routine will output:

The code is as follows

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Contiguous array array(4) { [0]=> string(3) "foo" [1]=> string(3) "bar" [2]=> string(3) "baz" [3]=> string(5) "blong" } string(27) "["foo","bar","baz","blong"]" Non-contiguous array 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"}" A non-continuous array generated by deleting a continuous array value 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); The result is: {"Name":"a1", "Number":"123", "Contno":"000" } It can be seen that json_encode() and json_decode() are compilation and decompilation processes. Note that json only accepts utf-8 encoded characters, so the parameters of json_encode() must be utf-8 encoded, otherwise you will get null characters or null If it’s in Chinese, be careful Find a solution online:

The code is as follows

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/* Process json_encode Chinese garbled characters */ <🎜> $data = array ('game' => 'Ice and Fire Country', 'name' => 'Thorn Spirit', 'country' => 'Frost Country', 'level' => 45 ); echo json_encode ( $data ); echo "
"; $newData = array (); foreach ( $data as $key => $value ) { $newData [$key] = urlencode ( $value ); } echo urldecode ( json_encode ( $newData ) ); ?>

Later I asked others for advice and found that base64 encoding can also be used, but base64 encoding cannot be placed in the URL. Baidu explained this:

Standard Base64 is not suitable for transmission directly in the URL, because the URL encoder will change the "/" and "+" characters in standard Base64 into the form of "%XX", and these "%" The number needs to be converted when it is stored in the database, because the "%" sign has been used as a wildcard character in ANSI SQL.

However, my data is sent via POST and is not in the HTTP head, but in the message-body, so it is not affected.

json_encode can only accept data in utf-8 format

For example: 'Xu' becomes 'u80e5' after json_encode processing, and the Chinese part of the final json is replaced with unicode encoding. What we have to solve is to convert the object into json and ensure that the Chinese inside the object still appears as normal Chinese in json. Now it seems that only using json_encode cannot achieve the goal.
My solution: first url-encode the Chinese field in the class (urlencode), then json-encode the object (jsonencode), and finally url-decode (urldecode) the json, which is the final json. The Chinese inside is still the same Chinese !
The test code is as follows:

The code is as follows

代码如下

复制代码

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"

Copy code

class myClass {

public $item1 = 1;

Related labels：

decode encode json php No and Chinese about Method and article show usage solve

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