php changes url request into array

PHP, as a scripting language, is often used in web development and can easily realize the development of dynamic web pages. In actual projects, we often need to convert URL request parameters into arrays to process data. This article will introduce how to use PHP to convert URL requests into arrays for processing.

1. The format of the URL request

Before we start to explain how to convert the URL request into an array, we need to first understand the format of the URL request. Usually, the format of a URL request consists of two parts: the requested page address and the request parameters. For example:

http://example.com/index.php?id=100&page=2

In this URL request, the requested page address is: http://example.com/ index.php, the request parameters are: id=100&page=2. Among them, the ? symbol is used to separate the request address and request parameters, and the & symbol is used to separate each parameter.

2. Use PHP to convert URL requests into arrays

PHP provides two methods to convert URL requests into arrays, using the $_GET and parse_str() functions.

1. Use $_GET

$_GET is a built-in global variable in PHP, which stores all the parameters obtained from the URL request. It can be used to easily make the URL request Convert to array. The sample code is as follows:

// 获取请求参数数组
$params = $_GET;

// 输出数组内容
var_dump($params);

When we output the $params variable, we can see the following results:

array(2) {
  ["id"]=>
  string(3) "100"
  ["page"]=>
  string(1) "2"
}

As can be seen from the above output results, the obtained $params array contains All parameters of the request, and the value of each parameter is of string type.

2. Use the parse_str() function

The parse_str() function is a built-in function of PHP that can convert the parameters in the URL request into an array format. The sample code is as follows:

// 定义请求参数
$params = 'id=100&page=2';

// 解析请求参数，并将结果存储到$params_array数组中
parse_str($params, $params_array);

// 输出数组内容
var_dump($params_array);

The output result is as follows:

array(2) {
  ["id"]=>
  string(3) "100"
  ["page"]=>
  string(1) "2"
}

As can be seen from the above output results, using the parse_str() function can also obtain the same results as using $_GET, which can realize the URL The request is converted to an array.

3. Processing Array Data

When we convert the URL request into an array, we can easily operate on the data. For example, we can use array values ​​to construct SQL query statements, or use values ​​to output HTML pages, etc.

The sample code is as follows:

// 定义请求参数
$params = 'id=100&page=2';

// 解析请求参数，并将结果存储到$params_array数组中
parse_str($params, $params_array);

// 根据请求参数构造SQL查询语句
$sql = 'SELECT * FROM `table` WHERE `id` = '.$params_array['id'].' AND `page` = '.$params_array['page'];

// 输出SQL语句
echo $sql;

When we run the above code, we can see that the output SQL statement is:

SELECT * FROM `table` WHERE `id` = 100 AND `page` = 2

As can be seen from the above example, we can Conveniently use the data converted into arrays to complete various tasks.

4. Summary

In web development, obtaining parameters from URL requests is a very common and important task. PHP provides a variety of methods to convert URL requests into arrays. This article introduces two of them: using the $_GET and parse_str() functions. By using these methods, we can process URL request parameters more conveniently and complete various web development tasks.

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