Convert php variables to json format data
In the last article we introduced "Mastering arrays in PHP (with code analysis)", in this article we will introduce json
, json
It is a lightweight data exchange format that has been widely used by most languages. When exchanging data with the front end in php
, data in the json
format is used. So how to This article will take you to take a look at how to convert variables into json format in PHP. Using json in php
requires the use of two functions json_encode
and json_decode.
1.json_decode
json_decode ( string $json , bool $assoc = false , int $depth = 512 , int $options = 0 )
$json: A string in json string format to be decoded. This function can only handle UTF-8 encoded data.
assoc: When this parameter is true, array will be returned instead of object.
depth: Specify the recursion depth.
options: A mask composed of constants.
Return value: Returns the data encoded in json via the appropriate PHP type.
2.json_encode
json_encode ( mixed $value , int $options = 0 , int $depth = 512 )
value: value to be encoded, Can be any data type except resource type. The encoding of all string data must be UTF-8.
options: A binary mask consisting of the following constants
depth: Set the maximum depth. Must be greater than 0.
Return value: Returns a JSON-encoded string on success or false on failure.
Code example:
<?php $arr = array ('a'=>"sdf",'b'=>2,'c'=>"dfasd",'d'=>4,'e'=>5); echo json_encode($arr); echo "<br>"; $js=json_encode($arr); var_dump(json_decode($js)); ?>
输出: {"a":"sdf","b":2,"c":"dfasd","d":4,"e":5} object(stdClass)#1 (5) { ["a"]=> string(3) "sdf" ["b"]=> int(2) ["c"]=> string(5) "dfasd" ["d"]=> int(4) ["e"]=> int(5) }
Recommendation: 《 Summary of PHP interview questions in 2021 (Collection)》《php video tutorial》
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