How to receive array parameters submitted by Ajax in PHP

When writing web applications, you often need to use Ajax to submit forms or use complex data types such as arrays for processing. In PHP, it is easy to receive parameters of basic data types, but receiving parameters of array type requires some special processing. The next article will take you to an in-depth discussion of how PHP receives array parameters submitted by Ajax.

1. Several ways to submit arrays with Ajax

1. Use serialization

When the client uses tools such as jQuery to make Ajax requests, you can The array is serialized and submitted. For example, the following example:

var data = {
    name: 'John',
    age: 25,
    hobbies: ['swimming', 'reading', 'coding']
};
$.ajax({
    type: 'POST',
    url: 'test.php',
    data: {myData: JSON.stringify(data)},
    success: function(res) {
        console.log(res);
    }
});

On the server side, you can use the json_decode() function to restore the received JSON string into an array, as follows:

$data = json_decode($_POST['myData'], true);
$name = $data['name'];
$age = $data['age'];
$hobbies = $data['hobbies'];

This method is simple and direct, but it requires Note: the amount of data submitted cannot be too large, otherwise it will affect performance.

2. Using FormData

Using the FormData object can achieve more flexible form data submission. For example, the following example:

var data = {
    name: 'John',
    age: 25,
    hobbies: ['swimming', 'reading', 'coding']
};
var formData = new FormData();
formData.append('name', data.name);
formData.append('age', data.age);
$.each(data.hobbies, function(index, item) {
    formData.append('hobbies[]', item);
});
$.ajax({
    type: 'POST',
    url: 'test.php',
    data: formData,
    contentType: false,
    processData: false,
    success: function(res) {
        console.log(res);
    }
});

On the server side, you can use $_POST and $_FILES to receive the data submitted by FormData, as follows:

$name = $_POST['name'];
$age = $_POST['age'];
$hobbies = $_POST['hobbies'];

It should be noted that the contentType and processData parameters must be set is false, otherwise the submission will fail.

3. Pass the array directly

If you are using tools such as jQuery for Ajax submission, you can directly pass the array to the data parameter. For example, the following example:

var data = {
    name: 'John',
    age: 25,
    hobbies: ['swimming', 'reading', 'coding']
};
$.ajax({
    type: 'POST',
    url: 'test.php',
    data: data,
    success: function(res) {
        console.log(res);
    }
});

On the server side, you can use $_POST to receive array type parameters, as follows:

$name = $_POST['name'];
$age = $_POST['age'];
$hobbies = $_POST['hobbies'];

This method is simple and efficient, but not flexible enough.

2. Receive array parameters

No matter which method is used to submit array parameters, the server needs special processing. PHP provides multiple methods for receiving array parameters.

1. Use $_POST

If you use serialization or directly pass an array for Ajax submission, you can use $_POST to receive array parameters, as follows:

$name = $_POST['name'];
$age = $_POST['age'];
$hobbies = $_POST['hobbies'];

It should be noted that PHP will only receive the first 1000 array elements by default; in addition, if a multi-dimensional array is submitted, it needs to be processed in JSON format.

2. Use file_get_contents

If the amount of submitted data is relatively large, you can use the file_get_contents function to receive array parameters, as follows:

$data = file_get_contents('php://input');
$jsonData = json_decode($data, true);
$name = $jsonData['name'];
$age = $jsonData['age'];
$hobbies = $jsonData['hobbies'];

This method can Receive large amounts of data and be more flexible.

3. Use php://input

Using php://input can also receive array parameters, as follows:

$data = file_get_contents('php://input');
parse_str($data, $arrayData);
$name = $arrayData['name'];
$age = $jsonData['age'];
$hobbies = $arrayData['hobbies'];

It should be noted that: The data received in this way is of string type and requires some type conversion.

3. Summary

When using Ajax to submit array parameters, you need to pay attention to issues such as the transmission method, the reception method, and the amount of data. If the amount of data is small, you can use serialization or FormData to submit it; if the amount of data is large, you can use functions such as file_get_contents and parse_str to receive it. Through the introduction of this article, I believe readers have already understood how PHP receives array parameters submitted by Ajax. But it should be noted that some filtering and verification need to be done in the code to improve the security of the data.

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