What are the input functions on the php page?

php page input functions include "$_GET[]" function, "$_POST[]" function, "$_REQUEST[]" function, "$_COOKIE[]" function, and "$_SERVER[]" function , "file_get_contents()" function and "fgets()" function, etc., detailed introduction: 1. "$_GET[]" function is used to obtain data passed through URL parameters; 2. "$_POST[]" function is used to obtain Data passed via POST request, etc.

The operating system of this tutorial: Windows10 system, PHP version 8.1.3, DELL G3 computer.

PHP is a very popular scripting language used for developing web applications. It has easy-to-learn syntax and powerful features. In PHP, input data is very important, which requires the use of input functions to process user input. This article will introduce some commonly used input functions in PHP.

1. `$_GET[]` Function: Used to obtain data passed through URL parameters. A GET request appends data to the URL and sends it to the server in the form of a query string. These data can be obtained through the `$_GET[]` function. For example, if the `name` parameter is passed through the URL, you can use `$_GET['name']` to get the value of this parameter.

2. `$_POST[]` Function: Used to obtain the data passed through the POST request. A POST request places data in the request body and sends it to the server. This data can be obtained through the `$_POST[]` function. For example, if the `username` field is submitted through a form, you can use `$_POST['username']` to get the value of the field.

3. `$_REQUEST[]` Function: Can obtain data passed in two ways: GET and POST. As mentioned before, `$_GET[]` is used to get data passed through URL parameters, and `$_POST[]` is used to get data passed through POST request. Using the `$_REQUEST[]` function, you can obtain the data passed in both ways at the same time.

4. `$_COOKIE[]` Function: Used to obtain cookie data stored in the client browser. In PHP, you can use the `setcookie()` function to set a cookie, and then you can use the `$_COOKIE[]` function to get the cookie value. For example, if a cookie named `username` is set, you can use `$_COOKIE['username']` to get its value.

5. `$_SERVER[]` Function: Used to obtain server-related information in HTTP requests. For example, information about the browser used by the user can be obtained through `$_SERVER['HTTP_USER_AGENT']`. The client's IP address can be obtained through `$_SERVER['REMOTE_ADDR']`.

6. `file_get_contents()` Function: Used to get the contents of the file. You can pass the path to a file as a parameter to this function and return the file's contents as a string. For example, `$content = file_get_contents('path/to/file.txt');` will read the contents of the specified file and store it in the `$content` variable.

7. `fgets()` Function: Used to read the content line by line from the file. This function requires two parameters, the first parameter is the open file handle, and the second parameter is the number of bytes read. For example, `$handle = fopen('path/to/file.txt', 'r'); $line = fgets($handle);` will open the file and read the contents of the first line.

The above are some commonly used input functions in PHP. These functions can handle different types of input data, including URL parameters, POST requests, cookies, file contents, etc. Developers can choose appropriate functions to process input data based on their needs, allowing for better user interaction and data processing.

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