How to convert php array into json string

In PHP, you can use the json_encode() function to convert an array into a json string, with the syntax "json_encode(array)". The json_encode() function can JSON encode variables and convert arrays into data in json string format.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Convert php array to json string

<?php
header(&#39;content-type:text/html;charset=utf-8&#39;);
$arr=[&#39;a&#39;=>10,&#39;b&#39;=>100,&#39;c&#39;=>&#39;Hello&#39;];
$str=json_encode($arr); //将数组转json格式的数据
var_dump($arr); 
var_dump($str); 
?>

Output:

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Description:

json_encode() is used to JSON encode variables, and can convert the data format of objects and arrays into json string format data.

Syntax:

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

Note:

1. $value is the value to be encoded, and this function is only valid for UTF8 encoded data;

2. options: a binary mask composed 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;

3. The second parameter is generally not needed;

4. JSON data is actually a string. You can use var_dump() to print it out to see the data type.

Return value: If the execution is successful, JSON data is returned, otherwise FALSE is returned.

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