Use PHP's json_encode() function to convert an array or object into a formatted JSON string

Use PHP's json_encode() function to convert an array or object into a formatted JSON string

In PHP development, it is often necessary to convert an array or object It is a JSON string for data transmission or storage. PHP provides the json_encode() function, which can easily convert arrays or objects into JSON format strings. This article will introduce how to use the json_encode() function to achieve this function through specific code examples.

First, we define an array and an object to demonstrate the conversion process:

$arr = array(
    'name' => 'John',
    'age' => 25,
    'gender' => 'male'
);

class Person {
    public $name;
    public $age;
    public $gender;

    public function __construct($name, $age, $gender) {
        $this->name = $name;
        $this->age = $age;
        $this->gender = $gender;
    }
}

$obj = new Person('Jane', 30, 'female');

Next, we use the json_encode() function to convert the array and object into a JSON string, using JSON_PRETTY_PRINT Parameters implement formatted output:

$arr_json = json_encode($arr, JSON_PRETTY_PRINT);
$obj_json = json_encode($obj, JSON_PRETTY_PRINT);

In the above code, $arr_json and $obj_json save the JSON format strings of $arr and $obj respectively.

Finally, we can print out these two JSON strings to view the conversion results:

echo $arr_json;
echo "
";
echo $obj_json;

Execute the above code, the following results will be output:

{
    "name": "John",
    "age": 25,
    "gender": "male"
}
{
    "name": "Jane",
    "age": 30,
    "gender": "female"
}

You can see At this point, the json_encode() function successfully converts arrays and objects into formatted JSON strings, and arranges them according to the format of key-value pairs. At the same time, using the JSON_PRETTY_PRINT parameter can achieve a more readable output effect.

In addition to the JSON_PRETTY_PRINT parameter, the json_encode() function also provides many other parameter options, which can be flexibly set according to actual needs. For example, you can use the JSON_UNESCAPED_UNICODE parameter to avoid escaping Chinese characters, and use the JSON_NUMERIC_CHECK parameter to convert numeric strings into numbers, etc.

Summary:

Through the above code examples, we learned how to use PHP's json_encode() function to convert an array or object into a formatted JSON string. Using this function can easily realize data transmission and storage, and can flexibly set parameters to meet needs. In actual development, we can use the json_encode() function according to specific circumstances to quickly convert arrays or objects into JSON.

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