Detailed explanation of PHP JSON format data interaction example code_PHP tutorial

Parsing JSON in PHP mainly uses two PHP JSON functions, json_encode and json_decode, which are much more convenient than PHP parsing XML. The following is a detailed introduction to the use of PHP JSON.
JSON Basics

JSON (JavaScript Object Notation) is a lightweight data exchange format.

JSON mainly has two structures:

　A collection of "name/value" pairs, which can be understood as an associative array (associative array) in PHP.

An ordered list of values. It can be understood as an ordinary array in PHP.

An object is an unordered collection of "name/value" pairs. An object starts with "{" (left bracket) and ends with "}" (right bracket). Each "name" is followed by a ":" (colon); "name/value" pairs are separated by a "," (comma).

An array is an ordered collection of values. An array starts with "[" (left bracket) and ends with "]" (right bracket). Values ​​are separated by "," (comma). Value can be a string, number, true, false, null, object or array enclosed in double quotes. These structures can be nested.

My current understanding of JSON is more towards arrays, similar to associative arrays in PHP. You can convert PHP arrays into JSON format.

For more introduction to JSON, please refer to the JSON official website and IBM’s introduction to JSON

　PHP JSON parsing example

PHP5.2 has included JSON as part of the PHP extension, so there is no need to install JSON separately. In addition, in order to ensure that the following PHP JSON example does not appear Chinese garbled characters, please ensure that your encoding format is UTF8.

JSON is a part of Javascript. First, let’s take a look at how to define JSON in Javascript. var json_obj = {'WebName':'PHP website development tutorial network'};
alert(json_obj.WebName);

var json_arr =[{'WebName':'PHP website development tutorial network','WebSite' :'http://www.jb51.net'},{'ArtTitle':'PHP JSON Example Explanation'}] alert(json_arr[1].ArtTitle); var php_json = [['PHP Website Development Tutorial Network','http://www.jb51.net'],['Article Title','PHP JSON Example Explanation']]; alert(php_json[1][0]);

In this JSON example code, I constructed all JSON forms.
Line 1 defines that JSON exists in the form of an object.
Line 4 defines that JSON exists in the form of an array. , a JSON object is nested, so it is somewhat similar to PHP’s associative array, but it is still an object.
Line 7 specifies that JSON exists in the form of an ordinary array.
Note: Since Javascript is case-sensitive, pay attention to the case of keys when accessing JSON associative array objects.
When PHP interacts with JSON format data, the first step is to convert the PHP array into JSON format data. You can use the json_encode function that comes with PHP5. When PHP parses the passed JSON format data, you need to use the json_decode function for parsing. Convert to a PHP array. The example code for PHP to convert and parse JSON data is as follows

Copy code

The code is as follows:


$json_arr = array('WebName'=>'PHP website development tutorial network','WebSite'=>'http://www.jb51.net');

$php_json = json_encode( $json_arr); echo $php_json; $php_json = json_decode($php_json); print_r($php_json); ?>

Explanation
: The associative array is defined here through PHP, and then converted into JSON format data through json_encode. The converted JSON object can be seen through the echo statement, and the JSON can be decoded through the PHP JSON parsing function json_decode. The formatted data is parsed into a PHP associative array. If the encoding is incorrect, JSON Chinese will appear garbled. If you use Editplus to debug PHP, please note that the encoding is changed from ANSI to UTF8 when saving the file.

Finally, let’s take a look at the complete PHP JSON interaction example

Copy the code

The code is as follows:

$json_arr = array('WebName'=>'PHP website development tutorial network','WebSite'=>'http://www.jb51.net');

$php_json = json_encode($ json_arr); ?>

At this point, the example of PHP converting and parsing JSON format data through the json_encode and json_decode functions has been introduced.

http://www.bkjia.com/PHPjc/322847.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/322847.htmlTechArticleParsing JSON in PHP mainly uses two PHP JSON functions, json_encode and json_decode, which are much more convenient than PHP parsing XML. The following is a detailed introduction to the use of PHP JSON. Basic introduction to JSON JSON(JavaScri...