Garbled characters when opening php program

When using PHP programs to develop websites, we often encounter garbled characters when opening the page. This has a great impact on the normal operation of the website, so we need to solve this problem in time. This article will introduce the reasons and solutions for PHP programs to open garbled characters. I hope it will be helpful to your development work.

1. Reasons for garbled codes

1. Different encoding formats

In the process of developing the website, in order to facilitate interaction and transmission, we will all use specific encoding formats. However, sometimes the encoding formats of the server and the client are not the same, resulting in garbled characters. For example, the server uses UTF-8 encoding format, but the client uses GBK encoding format. At this time, garbled characters will appear when opening the page on the client.

2. The database encoding format is not uniform

Sometimes, when we operate the database, the database encoding format and the PHP program encoding format are inconsistent, which will also cause data transmission errors, resulting in page generation. Garbled characters. For example, if the PHP program uses UTF-8 encoding format, but the database uses GBK encoding format, garbled characters will occur.

3. Wrong HTTP header information

If you forget to set the HTTP header information or set the information incorrectly when outputting content in the PHP program, garbled characters will also appear. The browser cannot parse the page normally, resulting in garbled characters.

2. Solution to garbled codes

1. Set the encoding format

In order to solve the garbled code problem, we need to set the encoding format in the PHP program. Generally speaking, UTF-8 encoding format is more commonly used, and the following code should be set at the beginning of the PHP file:

header("Content-type: text/html; charset=utf-8");

This line of code tells the browser that the current page uses UTF-8 encoding format, so that the page content can be displayed normally.

2. Unified encoding format

In order to avoid the problem of garbled codes caused by inconsistent encoding formats, we need to use the same encoding format on both the server and the client. For example, we can set the encoding format in the MySQL database, so that the encoding format between the PHP program and the database is consistent.

3. Modify HTTP header information

If there is a garbled problem caused by HTTP header information error, we can set the HTTP header information in the PHP program. We need to set the following code at the beginning of the PHP file:

header("Content-type: text/html; charset=utf-8");

This line of code tells the browser that currently The page uses UTF-8 encoding format and the content can be displayed normally.

4. Convert encoding format

If garbled characters have appeared, we can solve the problem by converting the encoding format. Sometimes, when we operate the database, we can perform encoding conversion in MySQL. We can use the following command to modify the encoding format of the database:

ALTER DATABASE database name CHARACTER SET character set;

If the problem cannot be solved, we can convert it in the PHP program. For example, we can use the iconv() function and mb_convert_encoding() function to convert the string into the specified encoding format to eliminate garbled characters.

Summary

Garbled characters are a common problem in website development. There are many reasons for it, and the solution is also complicated. In order to avoid the occurrence of garbled characters, we need to set the correct encoding format during the development process, unify the encoding formats of the server and client, and set the correct HTTP header information in the PHP program. If garbled characters appear, we can solve the problem by converting the encoding format. Once you master these solutions, you can successfully develop a high-quality website.

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