How to get an array of input parameters in php

PHP is a scripting language widely used in Web development. One of its functions is to receive and process user input. When implementing this function, PHP provides a series of built-in functions and syntax structures, including methods for obtaining input parameter arrays.

In PHP, there are two main ways to obtain the input parameter array, namely using superglobal variables and using functions. Next we will explain these two methods in detail.

1. Use super global variables

In PHP, super global variables are variables that can be accessed in any scope of the script, that is, they are global. PHP provides some built-in superglobal variables, among which $_GET and $_POST are the two most commonly used superglobal variables to obtain user input parameter arrays. The

$_GET variable is used to obtain the parameter array submitted through the GET method. These parameters usually appear at the end of the URL, such as http://www.example.com/index.php?id=1&name=John. To get these parameters, we can use the $_GET array to access them. For example, to get the id and name parameters in the URL above, you can use the following code:

$id = $_GET['id'];
$name = $_GET['name'];

Similarly, the $_POST variable is used to get the parameter array submitted through the POST method. These parameters are usually included in the body of the request. middle. The method of using the $_POST array to obtain parameters is the same as using $_GET. For example, to obtain the username and password submitted through the POST method, you can use the following code:

$username = $_POST['username'];
$password = $_POST['password'];

In addition to $_GET and $_POST, there are other commonly used superglobal variables, including $_REQUEST, $_SESSION, $_COOKIE wait. They are used to obtain request parameters, session parameters and cookie parameters respectively. For specific usage methods, please refer to the PHP official documentation.

It should be noted that there may be some security issues when using super global variables to obtain parameters. For example, users can tamper with parameters by modifying the URL, or use tools such as postman to send malicious requests. In order to avoid these security issues, we need to filter and verify the obtained parameters to ensure the legality of the parameters.

2. Use functions

In addition to using super global variables, PHP also provides some built-in functions for obtaining the user's input parameter array. The most commonly used are the following three functions:

1. $_SERVER['argv']: used to obtain the command line parameter array, that is, the input parameters of the script executed in PHP cli mode. For example:

php /path/to/script.php arg1 arg2 arg3

Among them, arg1, arg2, and arg3 are command line parameters, which can be obtained through the $_SERVER['argv'] array.

2. $_REQUEST: used to obtain the request parameter array, including GET, POST and COOKIE. For example:

$param = $_REQUEST['param'];

This way you can get the parameter named param in all request types.

3. file_get_contents('php://input'): used to obtain the parameter array in the HTTP request body, mainly used in RESTful API development. Code example:

$inputData = json_decode(file_get_contents('php://input'), true);

This will parse the JSON string in the HTTP request body into a PHP array.

It should be noted that from a security perspective, using functions to obtain user input parameter arrays is not the safest method. Therefore, we need to strictly filter and verify the user's input parameters before using these functions to ensure the validity and security of the data.

Summary

As a widely used Web development language, PHP has many methods for obtaining user input parameter arrays. Whether using superglobal variables or functions, you can easily obtain the input parameter array. However, when using these methods, we need to pay attention to security, filter and verify user parameters, and ensure the reliability and security of the program.

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