Php json instance Analysis _ PHP Tutorial

PHP uses JSON instance analysis. The PHP-encoded JSON (json_encode) PHPjson_encode () function is used in PHPJSON encoding. This function returns the value in JSON format. if it fails, FALSE is returned. Syntax: stringjson_encode ($ va encoded JSON (json_encode) in PHP)

The PHP json_encode () function is used for JSON encoding in PHP. This function returns the value in JSON format. if it fails, FALSE is returned.

Syntax:

String json_encode ($ value [, $ options = 0]) parameter:

Value: The value to be encoded. this function applies only to data encoded by the UTF-8.

Options: this optional value is a bitmask consisting of JSON_HEX_TAG JSON_HEX_QUOT, JSON_HEX_AMP, JSON_HEX_APOS, JSON_NUMERIC_CHECK, JSON_PRETTY_PRINT, response, JSON_FORCE_OBJECT

Example

The following example demonstrates how to convert a PHP array to JSON:

The code is as follows:
$ Arr = array ('a' => 1, 'B' => 2, 'C' => 3, 'D' => 4, 'E' => 5 ); Echo json_encode ($ arr ); ?> During execution, the following results are generated: {"A": 1, "B": 2, "c": 3, "d": 4, "e": 5}

The following example shows how to convert a PHP object to JSON:

The code is as follows:

Class Emp { Public $ name = ""; Public $ hobbies = ""; Public $ birthdate = ""; } $ E = new Emp (); $ E-> name = "running in "; $ E-> hobbies = "sports "; $ E-> birthdate = date ('m/d/Y h: I: s A', "8/5/1974 12:20:03 p "); $ E-> birthdate = date ('m/d/Y h: I: s A', strtotime ("8/5/1974 12:20:03 ")); Echo json_encode ($ e ); ?> During execution, the following results are generated: {"Name": "coming in", "hobbies": "sports", "birthdate": "08/05/1974 12:20:03 "}

Decoding JSON in PHP (json_decode)

PHP json_decode () function is used to decode JSON in PHP. The return value of this function is decoded from json to the appropriate PHP type.

Syntax:

Mixed json_decode ($ json [, $ assoc = false [, $ depth = 512 [, $ options = 0]) parameter:

Json_string: it must be a UTF-8-encoded data-encoded string

Assoc: when this is a Boolean parameter set to TRUE, the returned object will be converted to an associated array.

Depth: it is an integer parameter that specifies the recursive depth

Options: JSON decoding of a bitmask of the integer type. JSON_BIGINT_AS_STRING is supported.

Example

The following example shows how to use PHP to decode JSON objects:

The code is as follows:
$ Json = '{"a": 1, "B": 2, "c": 3, "d": 4, "e": 5 }'; Var_dump (json_decode ($ json )); Var_dump (json_decode ($ json, true )); ?> During execution, the following results are generated: 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) }

Assume that the JSON data we obtain is as follows: (you can use curl, fsockopen, and so on)

The code is as follows:

{ "Translation": ["Hello world"], "Query": "Hello World ", "ErrorCode": 0, "Web ":[ { "Value": ["hello world"], "Key": "Hello World" }, { "Value": ["Hello World"], "Key": "Hello World" } ] } Use the json_decode function to return the array: Array ( [Translation] => Array ( [0] => Hello world ) [Query] => Hello world [ErrorCode] => 0 [Web] => Array ( [0] => Array ( [Value] => Array ( [0] => hello world ) [Key] => Hello world ) [1] => Array ( [Value] => Array ( [0] => Hello World ) [Key] => Hello world ) ) )

We can use the following methods in PHP to obtain the desired value:

The code is as follows:

/*---------------------------------- $ Data =' { "Translation": ["Hello world"], "Query": "Hello World ", "ErrorCode": 0, "Web ":[ { "Value": ["hello world"], "Key": "Hello World" }, { "Value": ["Hello World"], "Key": "Hello World" } ] } '; -------------------------------------*/ $ Data = < { "Translation": ["Hello world"], "Query": "Hello World ", "ErrorCode": 0, "Web ":[ { "Value": ["hello world"], "Key": "Hello World" }, { "Value": ["Hello World"], "Key": "Hello World" } ] } STR; $ Jsondata = json_decode ($ data, true ); Header ("Content-Type: text/html; charset = UTF-8 "); // Print_r ($ jsondata ); Echo" ". $ Jsondata ['translation'] [0]; // Hello world Echo" ". $ Jsondata ['query']; // Hello, world Echo" ". $ Jsondata ['web'] [0] ['value'] [0]; // hello world Echo" ". $ Jsondata ['web'] [1] ['key']; // Hello, world ?>

Example, combined with database operations

The code is as follows:
Include './include/conn. php'; // Database link file $ SQL _notice = mysql_query ('select * FROM gg_notice where enable = "1" limit 0, 10 '); $ Notice = mysql_fetch_array ($ SQL _notice, MYSQL_ASSOC ); Print_r ($ notice ); ?> Tutorial provided by the first php network-generate the data read by the database in json format