Detailed explanation of how PHP obtains the post value as an array

In PHP, when we send a POST request to the server, we can get the parameter value of the POST request through the $_POST global variable. When the parameter value in the POST request is an array, we need a special way to obtain the array value.

The following are some ways to get the POST value as an array:

1. Get the serialized POST value

We can convert the array in the POST request After serialization, it is sent to the server, and then the value is obtained through the following code:

$array = unserialize($_POST['array']);

Here we need to serialize the array on the client and then send it to the server as a POST request parameter. Deserialize it through the unserialize() function on the server side to obtain the corresponding array value.

2. Get POST value through JSON format

We can convert the array to JSON format on the client side and send it to the server as a POST request parameter, and pass it on the server side The json_decode() function decodes it into a PHP array.

Client-side code example:

var arr = [1,2,3,4];
$.ajax({
    url: "example.php",
    type: "POST",
    data: {
        array: JSON.stringify(arr)
    },
    success: function(response) {
        console.log(response);
    }
});

Server-side code example:

$array = json_decode($_POST['array'], true);

This way we can decode the JSON-formatted parameter value in the POST request into a PHP array.

3. By modifying the request parameter name

We can add square brackets [] after the parameter name to convert the parameter value into an array.

Client code example:

var arr = [1,2,3,4];
$.ajax({
    url: "example.php",
    type: "POST",
    data: {
        'array[]': arr
    },
    success: function(response) {
        console.log(response);
    }
});

Server code example:

$array = $_POST['array'];

So we can read the value of the parameter name array[] in the POST request. Gets the requested array value.

Summary:

The method of obtaining the POST value as an array in PHP is more flexible and diverse, and needs to be selected according to the actual situation. Each method has its advantages and disadvantages and needs to be used appropriately according to specific scenarios.

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