How to convert PHP array to json

In PHP development, we often need to convert arrays into JSON format to facilitate data processing, and this conversion process can be achieved using the json_encode() function provided by PHP. JSON is a lightweight data exchange format. Due to its simplicity, easy to understand, easy to read, easy to write, and easy to debug, it has been widely used in Web front-end development in recent years.

The json_encode() function is a built-in function in PHP that accepts a PHP object or array and converts it into the corresponding JSON string.

The syntax of this function is as follows:

string json_encode(mixed $value, int $options = 0, int $depth = 512)

where $value represents the need to be converted into An array or object of JSON, $options represents the conversion options, and $depth represents the maximum number of levels to convert the nested array.

Let’s look at some examples:

1. Convert array to JSON string

// Define an array
$arr ​​= array("name" => "Zhang San", "age" => 20, "gender" => "Male");

// Will Convert array to JSON string
$json = json_encode($arr);

//Output the converted JSON string
echo $json;

//Output result :{"name":"Zhang San","age":20,"gender":"male"}

?>

In the above example, we defined a name containing , the associative array $arr of age and gender, then convert it into a string in JSON format, and finally output the string value.

2. Convert the array to a JSON array

// Define an array
$arr ​​= array("Zhang San ", 20, "Male");

// Convert the array to a JSON array
$json = json_encode($arr);

// Output the converted JSON array
echo $json;

// Output result: ["Zhang San",20,"Male"]

?>

In the above example, we define Get an ordinary array $arr, then convert it into JSON array form, and finally output the result.

3. Convert to JSON object

// Define an associative array
$arr ​​= array("name" = > "Zhang San", "age" => 20, "gender" => "Male");

// Convert the array into a JSON object
$obj = json_encode($arr , JSON_FORCE_OBJECT);

// Output the converted JSON object
echo $obj;

// Output result: {"name":"Zhang San","age": 20,"gender":"male"}

?>

In the above example, we used the second parameter JSON_FORCE_OBJECT of the json_encode() function. This parameter can convert an ordinary array Convert it into a JSON object, and the final output result is in the form of a JSON object.

Summary: In PHP, it is very convenient to convert an array into a JSON string, just use the built-in json_encode() function. At the same time, we can also set conversion options according to needs, such as converting to JSON objects, etc. I hope the above introduction is helpful to you!

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