How to solve the problem of Chinese garbled characters when converting php hexadecimal to string

When using PHP to convert hexadecimal to string, the problem of Chinese garbled characters sometimes occurs. This problem may occur in many situations, such as when reading data from the database, or when accepting user input. This article will introduce some common Chinese garbled problems and provide some solutions.

1. Chinese garbled characters appear when reading data from the database

If garbled characters appear when reading data containing Chinese from the database, it may be Because the database character set is incorrectly set. Generally, we need to set the character set of the database to utf8mb4 to display Chinese characters correctly.

You can set the character set when connecting to the database:

$conn = new mysqli($host, $user, $password, $db_name);
$conn->set_charset("utf8mb4");

In addition, you also need to set the character set to utf8mb4 when creating a database table:

CREATE TABLE `my_table` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `name` VARCHAR(50) CHARACTER SET utf8mb4,
  ...
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;

2. Chinese garbled characters appear when converting hexadecimal to a string

If your PHP code needs to convert a hexadecimal string to a Unicode string, and Chinese characters appear during the process Garbled characters may be caused by incorrect conversion of hexadecimal strings into Unicode strings.

A correct method is to first convert the hexadecimal string to a binary string and then convert it to a Unicode string. For example:

function hex2str($hex) {
    $bin = hex2bin($hex);
    return mb_convert_encoding($bin, 'UTF-8', 'UCS-2BE');
}

In the above code, the hex2bin() function converts a hexadecimal string to a binary string, and then the mb_convert_encoding() function converts it to a Unicode string.

In addition to the above solutions, there are some other methods to solve the problem of Chinese garbled characters. It is necessary to choose the appropriate method according to the specific situation.

In short, dealing with Chinese garbled characters in PHP requires special attention to character set settings and encoding conversion. Only by correctly setting the character set and adopting the correct encoding conversion method can the problem of Chinese garbled characters be avoided.

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