Convert php array object to url parameters

In PHP development, sometimes it is necessary to convert arrays or objects into URL parameters. For example, when we use cURL to send an HTTP request, we need to convert the request parameters into URL parameter format. Let's learn how to convert array objects to URL parameters in PHP.

1. PHP array to URL parameter

Use the http_build_query function to convert a PHP array into a URL parameter string. The code example is as follows:

$params = array('name' => '张三', 'age' => 18);
$queryString = http_build_query($params);
echo $queryString; // 输出：name=%E5%BC%A0%E4%B8%89&age=18

The first parameter of the http_build_query function is an array, the second parameter is the prefix, and the third parameter is the delimiter. If there is no prefix and delimiter, these two parameters do not need to be passed in.

2. PHP object to URL parameters

For PHP objects, we can first convert them into arrays, and then use the http_build_query function to convert them into URL parameters. The code example is as follows:

class User {
  public $name;
  public $age;
  public function __construct($name, $age) {
    $this->name = $name;
    $this->age = $age;
  }
}
$user = new User('张三', 18);
$params = (array)$user; // 将对象转换成数组
$queryString = http_build_query($params);
echo $queryString; // 输出：name=%E5%BC%A0%E4%B8%89&age=18

3. Handling special characters

When using the http_build_query function to convert, you need to pay special attention to whether the parameters contain special characters. For example, characters such as spaces, , / and so on need to be escaped into a specific encoding format in URL parameters. The code example is as follows:

$params = array('name' => '张三 王五', 'age' => 18);
$queryString = http_build_query($params);
echo $queryString; // 输出：name=%E5%BC%A0%E4%B8%89+%E7%8E%8B%E4%BA%94&age=18

In the above example, the parameters contain spaces, and the http_build_query function escapes them into plus signs ( ). If you need to convert to UTF-8 encoding format, you can use the urlencode function:

$params = array('name' => '张三 王五', 'age' => 18);
$queryString = http_build_query($params);
$queryString = str_replace('+', '%20', $queryString); // 将加号替换成UTF-8编码格式的空格
echo $queryString; // 输出：name=%E5%BC%A0%E4%B8%89%20%E7%8E%8B%E4%BA%94&age=18

Summary:

Through the above examples, we have learned how to convert array objects to URL parameters in PHP. Specifically, we can use the http_build_query function to convert a PHP array into a URL parameter string, or we can first convert the object into an array and then use this function to convert it. At the same time, when processing special characters, you need to consider whether you need to use the urlencode function for encoding conversion.

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