How to convert array to json array in php

In PHP, we can use arrays to store and manage data, while JSON is a lightweight data exchange format that uses a syntax similar to JavaScript objects, so it is very suitable for use in web applications.

When we need to convert an array into JSON format in PHP, we only need to use the PHP built-in function json_encode() to achieve it.

Let's take a look at how to use the json_encode() function to convert a PHP array into a JSON array.

1. A simple PHP array

First, we assume that we have a simple PHP array containing several elements:

$array = array(
   'name' => 'Tom',
   'age' => 28,
   'gender' => 'male'
);

The above code defines an association Array $array contains three elements: name, age and gender.

2. Use the json_encode() function to convert the array

We can use the json_encode() function to convert the array into JSON format.

$json = json_encode($array);
echo $json;

Run the above code, the output result is as follows:

{"name":"Tom","age":28,"gender":"male"}

3. Convert JSON to PHP array

We can also use json_decode() Function converts JSON format to PHP array.

$phpArray = json_decode($json, true);
print_r($phpArray);

The above code parses the JSON format string $json into a PHP array and outputs the result:

Array
(
    [name] => Tom
    [age] => 28
    [gender] => male
)

Note that the second parameter is true, indicating that the result will be parsed as an array instead of an object. If the second parameter is not passed in, it will be parsed as an object by default.

4. Use the parameters of the json_encode() function

json_encode() The function also supports some parameters that can be used to control the output in JSON format.

$json = json_encode($array, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE);
echo $json;

The above code beautifies the output in JSON format and uses the JSON_UNESCAPED_UNICODE parameter, which means that Unicode characters are not escaped and Chinese characters will not appear when outputting \ The escape sequence for uxxxx.

The output results are as follows:

{
    "name": "Tom",
    "age": 28,
    "gender": "male"
}

5. Summary

In general, the json_encode() function in PHP is very convenient and practical and can help We quickly convert PHP arrays to JSON format.

Of course, we can also use the json_decode() function to convert the JSON format into a PHP array or object, so that we can use JSON data in PHP.

If you usually develop web applications, these two functions are indispensable tools. It is recommended to learn more about them and master their usage.

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