How to convert array to json data in php

In PHP, you can use the json_encode() function to convert the array into json format data. The syntax is "json_encode(array variable, $options)". The json_encode() function can JSON encode PHP variables. If the conversion is successful, it will return JSON format data. If the conversion fails, it will return FALSE.

The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer

php will convert the array Method for json data

In PHP, you can use the json_encode() function to convert the array into json format data.

The json_encode() function can JSON encode PHP variables and return JSON format data; if the conversion fails, FALSE will be returned.

This function accepts one required parameter and one optional parameter:

json_encode ( $value [, $options = 0 ] )

Parameters

• value: The value to encode. This function is only valid for 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

## Description:

• # Returns the string type, which contains the representation of value in JSON form.

• The encoding is affected by the options parameter passed in. In addition, the encoding of floating point values ​​depends on serialize_precision.

Example: Convert array to json format

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);   
$arr = array (&#39;a&#39;=>1,&#39;b&#39;=>2,&#39;c&#39;=>3,&#39;d&#39;=>4,&#39;e&#39;=>5);
var_dump($arr);
echo "数组转json格式：<br><br>";
$json=json_encode($arr);
echo $json;
var_dump($json);
?>

Extended knowledge: json data Convert to array

In PHP, you can use the json_decode() function to decode JSON data and convert the JSON data into the appropriate PHP data type (object or array).

Conversion syntax:

json_decode($json,$assoc)

• $assoc parameter can be omitted, the default value is false;
  If this parameter is omitted, the JSON data will be converted into an object
  If the value is set to TRUE, it will be converted to an array.

Example: Convert json value to array

<?php
header("Content-type:text/html;charset=utf-8");
$json = &#39;{"a":"php","b":"mysql","c":3}&#39;; 
var_dump($json); 
$arr=json_decode($json,TRUE);   
var_dump($arr);
?>

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