php database save garbled code

The problem of garbled characters when PHP is stored in the database has always been one of the headaches for developers. This problem may result in data being incomplete or not being processed correctly, especially when multiple languages ​​or character sets are involved. This article will introduce common causes and solutions for garbled characters stored in PHP databases.

1. Encoding problem

Encoding problem is the main reason why PHP stores garbled characters in the database. Because the character set used by PHP by default is ASCII encoding, when we store data in other encodings, garbled characters may occur. The best way to solve this problem is to make sure you use the same character set.

In PHP, you can set the character set in the following way:

mysqli_set_charset($connect, "utf8");

Of course, you must also set the same character set in your database:

alter database dbname character set utf8;

2. Using incorrect functions

In PHP, there are three commonly used functions that can be used to store data into the database: mysqli_query(), mysqli_stmt_execute() and PDO::exec(). If you choose the wrong function, the data stored in the database may be garbled.

The mysqli_query() function is the most commonly used function to store data in the MySQL database. If the data you want to store is plain text, then use the mysqli_query() function. However, if the data you want to store contains binary data (such as pictures or other files), then it is more appropriate to use the mysqli_stmt_execute() or PDO::exec() function. These functions support binary stream and BLOB type data.

Using the correct function can avoid garbled data.

3. Data loss

Sometimes when storing data into the database, data loss may occur. The cause of this problem may be that PHP uses string truncation functions when storing data. For example, if you try to store a 100-character string and your database field is only 50 characters long, you will lose 50 characters.

The best way to solve this problem is to check the database field length before storing the data. If your data length is larger than the database field length, you can split the data into two parts and store them in two different fields. If your data is not important, you can also choose to ignore it.

4. Data type issues

In PHP, there are several different data types that can be used to store data in the database, including strings, integers and floating point numbers. If you try to store a floating point number into an integer type field, you're likely to run into some problems. On the contrary, if you try to store an integer into a string field, it may also cause the data to be garbled.

To avoid this problem, you should check the data type of the database field before storing the data. If you try to store data of a different data type, then you should convert the data to the corresponding type before storing. For example, if you want to store a floating point number, you can use the (float) or (double) function to convert it to a floating point number type.

5. PHP version issues

Some PHP versions may have some problems, such as some old versions that do not support UTF-8 encoding. If you encounter these problems, then you may consider upgrading your PHP version. Alternatively, you can solve these problems by introducing some patches and solutions.

6. Use the ORM framework

The ORM framework is a library that simplifies the use of databases. It treats database tables as objects, allowing you to store and obtain data more conveniently. Using the ORM framework can make it easier for you to solve the problem of garbled characters when PHP is stored in the database.

By using an ORM framework, you can avoid using outdated functions and wrong data types. The ORM framework can automatically type convert data, solve encoding problems, and ensure data integrity.

7. Summary

The above are the common reasons and solutions for garbled characters when PHP is stored in the database. If you encounter this problem, then you can solve it by checking encoding, using correct functions, avoiding data loss, checking data types, upgrading PHP version and using ORM framework. Of course, the most important thing is to fully understand the nature of the data and encoding, and choose the right method based on your needs.

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