How to solve the problem of garbled characters when reading mysql utf-8 in php

In programming, we often encounter operations of reading databases. MySQL is a commonly used relational database, but garbled characters may occur during data transfer with PHP, especially when it comes to utf. -8 encoding. This article will introduce the solution to the problem of reading MySQL utf-8 garbled characters in PHP.

1. Why do garbled codes appear?

Before understanding the solution to the garbled code problem, let’s first understand how the garbled code problem occurs.

1. Inconsistency between database encoding and table encoding

MySQL supports multiple encodings, and databases and tables between different encodings cannot be seamlessly connected. If the encoding of the MySQL database and table is inconsistent, garbled characters may occur.

2. Database connection encoding setting error

When connecting to the MySQL database, you need to set the connection encoding. If the connection encoding setting is incorrect, garbled characters may appear when reading the database. .

3. PHP file encoding does not meet the utf-8 encoding requirements

PHP files also need to use utf-8 encoding to read the content in the MySQL database. If the PHP file does not If you read the content in the MySQL database according to UTF-8 encoding requirements, garbled characters may occur.

2. Solution

According to the causes of garbled characters, we can solve the problem of utf-8 garbled characters from the following three aspects.

1. Database encoding and table encoding settings

First of all, make sure that the encoding of the MySQL database and table is consistent, otherwise garbled characters will occur no matter how you configure it. Encoding settings need to be made when creating MySQL databases and tables. Under normal circumstances, utf-8 encoding will be selected to ensure that the encoding of the MySQL database and tables is consistent.

2. PHP file encoding settings

In PHP files, you need to set the file encoding to utf-8 to prevent garbled characters.

3. When connecting to the MySQL database, set the connection encoding

When connecting to the MySQL database, you need to set the connection encoding to utf-8 to ensure that the read content is utf-8 Encoded. This setting is generally provided by application frameworks, such as the Laravel framework, which can execute the following code when reading the database:

\DB::statement('set names utf8mb4');

If you are not using a framework, you need to set the connection encoding through the following code:

$conn=mysqli_connect("localhost","my_user","my_password","my_db");
mysqli_set_charset($conn,"utf8");

In the above code, use the mysqli_set_charset() function to set the connection encoding.

In addition to the above-mentioned utf-8 encoding when setting the connection, you can also use the following instructions:

SET character_set_connection=utf8mb4;
SET character_set_client=utf8mb4;
SET character_set_results=utf8mb4;

It should be noted here that the above instructions should be sent before reading the data.

In addition, if you use PDO to connect to the MySQL database, you also need to set it up. You can set the utf-8 encoding when connecting to MySQL through the following code:

$dbh = new PDO('mysql:host=localhost;dbname=mydb', $user, $pass, array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8mb4"));

In this example, when using PDO to connect to the MySQL database, set the connection encoding by setting the MYSQL_ATTR_INIT_COMMAND attribute to "SET NAMES utf8mb4".

In short, in order to ensure that PHP can correctly read the contents of the MySQL database, we need to consider the three aspects of database encoding, PHP file encoding and connection encoding at the same time to ensure that their encoding methods are consistent, so that utf can be avoided -8 The occurrence of garbled code problems.

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