How to convert php array to json and send it to the front desk

In front-end development, it is often necessary to obtain data from the back-end. In back-end development, it is often necessary to convert the array into JSON format and transmit it to the front-end through the network.

As one of the most commonly used languages ​​in back-end development, PHP provides many convenient methods to complete this task. This article will introduce how to use PHP to convert an array to JSON and pass it to the front end.

1. Convert array to JSON format in PHP

PHP provides a built-in function json_encode() to convert array to JSON format. Using this function is very simple, just pass it the array to be converted as a parameter.

The following is a simple example:

$data = array(
    'name' => 'John',
    'age' => 30,
    'gender' => 'male'
);

echo json_encode($data);

The above code will output the following JSON string:

{"name":"John","age":30,"gender":"male"}

2. Pass JSON data to the front end

In PHP, you can use some methods to pass JSON data to the front end. The most common method is to output a JSON string into an HTTP response. In this way, the front end can obtain JSON data through Ajax requests.

The following is a simple PHP code example for outputting JSON data:

$data = array(
    'name' => 'John',
    'age' => 30,
    'gender' => 'male'
);

header('Content-Type: application/json');
echo json_encode($data);

The above code will output the following HTTP response:

{
    "name": "John",
    "age": 30,
    "gender": "male"
}

Please note that we are in the header Content-Type is set to application/json. This tells the browser that the returned data is in JSON format and can be parsed correctly.

3. Handling JSON data in the front-end

In the front-end, JSON data can be parsed by using the JSON object built into modern browsers. Here is a simple example of getting the JSON data from the above code and parsing it into a JavaScript object:

var xhr = new XMLHttpRequest();
xhr.open('GET', 'your-php-script.php', true);
xhr.onload = function() {
    if (xhr.status === 200) {
        var data = JSON.parse(xhr.responseText);
        console.log(data.name); // 输出 "John"
    }
};
xhr.send();

The above code first gets the JSON data from our PHP script via an Ajax request. We then use the JSON.parse() method to parse the JSON string into a JavaScript object. Finally, we can access the data obtained through the name attribute.

4. Passing JSON data directly into JavaScript

If you don’t want to use Ajax requests to get JSON data from PHP, you can also pass JSON data directly as variables into JavaScript. The following is a simple example:

<script>
var data = <?php echo json_encode($data); ?>;
console.log(data.name); // 输出 "John"
</script>

In this example, we convert the $data array to JSON format, and then use PHP's echo statement to output the JSON data into JavaScript code. As long as you convert the variables to JSON format in the PHP code, you can easily pass the JSON data into the JavaScript code in the front-end.

Summary

In this article, we introduced how to use PHP to convert an array into JSON format and pass it to the front-end. We also demonstrated how to parse JSON data using a modern browser's JSON object, and showed a way to pass JSON data directly into JavaScript. Hopefully you now understand how to make and process JSON data in PHP.

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