php json convert array object

In PHP development, JSON (JavaScript Object Notation) format is often used to process data. JSON is a lightweight data exchange format whose syntax is similar to data types in JavaScript, such as strings, numbers, arrays, objects, etc. When processing JSON data, we usually need to convert it into an array or object in PHP. Below are some examples of converting JSON data into arrays and objects using PHP.

1. Convert JSON string into array

We can use the json_decode() function in PHP to convert JSON string into array. This function can accept two parameters. The first parameter is the JSON string to be processed. The second parameter is an optional parameter of Boolean type. If the value of this parameter is true, the JSON string is converted into an associative array. ; If the value of this parameter is false or this parameter is not passed in, the JSON string will be converted into an index array.

The following is an example of converting a JSON string into an index array:

$json_str = '[{"name":"张三","age":20},{"name":"李四","age":22}]';
$array = json_decode($json_str);
print_r($array);

Output result:

Array
(
    [0] => stdClass Object
        (
            [name] => 张三
            [age] => 20
        )

    [1] => stdClass Object
        (
            [name] => 李四
            [age] => 22
        )

)

As you can see, we successfully converted the JSON string into An indexed array containing two objects. If we set the second parameter of the json_decode() function to true, we can convert the JSON string into an indexed array containing an associative array.

2. Convert JSON strings into objects

We can also use the json_decode() function in PHP to convert JSON strings into objects. When converting a JSON string into an object, we need to set the second parameter of the json_decode() function to false or not pass in this parameter.

The following is an example of converting a JSON string into an object:

$json_str = '{"name":"张三","age":20}';
$obj = json_decode($json_str);
echo $obj->name;
echo $obj->age;

Output result:

张三
20

As you can see, we successfully converted the JSON string into an An object containing two properties whose values ​​we can access just like object properties.

3. Convert an array into a JSON string

We can use the json_encode() function in PHP to convert an array or object into a JSON string. This function has two parameters. The first parameter is the array or object to be processed. The second parameter is an optional parameter used to control the format and indentation of the generated JSON string.

The following is an example of converting an array into a JSON string:

$array = array(
    array("name" => "张三", "age" => 20),
    array("name" => "李四", "age" => 22)
);
$json_str = json_encode($array);
echo $json_str;

Output result:

[{"name":"张三","age":20},{"name":"李四","age":22}]

As you can see, we successfully converted the array into a JSON character string.

4. Convert the object into a JSON string

Similarly, we can use the json_encode() function in PHP to convert the object into a JSON string.

The following is an example of converting an object into a JSON string:

class Person {
    public $name;
    public $age;

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

$p = new Person("张三", 20);
$json_str = json_encode($p);
echo $json_str;

Output result:

{"name":"张三","age":20}

As you can see, we successfully converted the object into a JSON character string.

Summary

The above are some examples of converting JSON data into PHP arrays and objects. In actual development, we often need to transfer data between PHP and JavaScript, and then we need to use JSON format. Therefore, it is important to understand how to handle JSON data in PHP.

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