How to convert php array to json format

PHP array to JSON formatting

Data transfer is an important aspect when developing websites and applications. JSON format is a universal data exchange format, which is widely used in front-end and back-end data interaction. As a PHP developer, we need to master the method of converting PHP arrays into JSON format in order to develop RESTful APIs and other work.

PHP's method of converting an array into JSON is very simple, just use a function json_encode(). Below we will introduce how to use this function to convert a PHP array into JSON format.

Syntax
json_encode($array, $options)

Parameters

• $array: required Converted PHP array
• $options: Optional, constant containing options for conversion

Return value

• Returns the corresponding JSON format string, returns false when the conversion fails

Sample code

<?php // PHP数组
$array = array(
    "name" => "张三",
    "age" => 20,
    "gender" => "男"
);

// 将PHP数组转化为JSON格式
$json = json_encode($array);

// 输出JSON格式字符串
echo $json;
?>

In this example, we define a PHP array and use it The json_encode() function converts it into a JSON format string. Finally, we output this JSON format string, and the result is as follows:

{
    "name": "张三",
    "age": 20,
    "gender": "男"
}

As you can see, the converted JSON format string is very similar to the original PHP array, except that all keys and values ​​are enclosed in double quotes. , while colons are used to separate keys and values.

We can also pass some commonly used options to the json_encode() function to ensure the accuracy of the JSON format string. For example, we can use JSON_PRETTY_PRINT to format the output JSON string to make it more readable. The sample code is as follows:

<?php // PHP数组
$array = array(
    "name" => "张三",
    "age" => 20,
    "gender" => "男"
);

// 将PHP数组转化为格式化的JSON格式
$json = json_encode($array, JSON_PRETTY_PRINT);

// 输出格式化的JSON格式字符串
echo $json;
?>

In this example, we pass a constant named JSON_PRETTY_PRINT to the json_encode() function to make the output JSON format string Easier to read. The results here are as follows:

{
    "name": "张三",
    "age": 20,
    "gender": "男"
}

As you can see, this output JSON format string is more readable, making it easier for us to understand the content.

Summary
In this article, we learned how to use the json_encode() function in PHP to convert a PHP array into a JSON format string. As a PHP developer, this is one of the skills we use frequently. In actual work, we also need to understand how to convert JSON format strings into PHP arrays for data processing and subsequent development work.

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