How to convert object to json in php

PHP is a very popular programming language that is widely used in web development. In web applications, data exchange between client and server is very important, so it is necessary to use a data format that is readable and easy to parse and process. JSON is a streamlined data exchange format that is very readable and parsable.

In PHP, we can use the built-in function to convert objects into JSON strings. This function is very convenient and practical. In this article, we will introduce how to convert an object into a JSON string.

Use the json_encode() function to convert objects into JSON

In PHP, it is very easy to use the json_encode() function to convert objects into JSON strings. The json_encode() function is used to convert variables in PHP into JSON format strings. Using this function, we can convert any PHP type of data into JSON format, such as objects, arrays, or even simple strings.

The following is a sample code:

class Person {
   public $name = "";
   public $age  = "";
   public $city = "";
}

$person = new Person();
$person->name = "John";
$person->age  = 32;
$person->city = "London";
echo json_encode($person);

After running the code, the following JSON string will be generated:

{"name":"John","age":32,"city":"London"}

The json_encode() function converts the attributes of the Person object we created For the properties and values ​​of the JSON object. This JSON object can be used by clients to parse and display data.

Transcoding Unicode characters

When using the json_encode() function, you need to pay attention to the Unicode characters in the string and need to transcode them according to the specifications. In PHP, UTF-8 encoding is used, so the string needs to be transcoded to ensure the correct encoding.

We can use the htmlspecialchars() function to escape the JSON string:

echo htmlspecialchars(json_encode($person), ENT_QUOTES, 'UTF-8');

After executing the code about escaping, the function will generate the following string:

{"name":"John","age":32,"city":"London"}

This string has been properly escaped and can be reused on the web without errors.

Conclusion

In this article, we have seen how to convert an object into a JSON string using PHP's json_encode() function. JSON is a data exchange format that is very readable and parsable and can be easily used for data exchange between clients and servers in web applications. In summary, PHP provides many functions and methods that make using JSON in web development very convenient and practical.

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