How to solve the problem of garbled characters in PHP image watermarks

When using PHP to add text watermarks, sometimes the text will be garbled. This problem is usually caused by incompatible character encodings. This article will describe several possible causes of this problem and provide possible solutions.

Cause 1: Inconsistent character encoding

When PHP programs use different character encoding formats to process text, garbled characters may occur. For example, if the PHP code adopts UTF-8 encoding format and the watermark text has a different encoding format, such as GBK, garbled characters will appear.

Solution: Make sure that the PHP program and the watermark text use the same encoding format. It is best to use UTF-8 encoding format.

Reason 2: The font does not support certain characters

Some fonts only support specific character sets. If characters that are not supported by the font are used in the watermark, garbled characters will occur.

Solution: Use a font that supports the required characters

Reason three: The PHP interpreter does not support the characters related to the watermark font

Sometimes the PHP interpreter may not recognize the watermark Certain characters in a font, especially if the font is not a standard font.

Solution: Install the required fonts. For example, if you need to use Chinese watermarks, you need to install a Chinese font library, such as Wenquanyi font or Chinese Song font.

Cause 4: The server does not install the required fonts

In some cases, the PHP program can access the required font files, but the server itself does not have the required font library installed.

Solution: Install the required font library on the server

Cause five: Special characters are used in the PHP program

Sometimes, special characters are used in the PHP program, For example, parentheses, curly brackets, equal signs, etc. These characters may be related to the encoding compatibility of the watermark text, resulting in garbled output.

Solution: Use escape symbols to handle special characters, such as adding a backslash "\" before the parentheses, so that the PHP interpreter can correctly recognize these characters.

Summary

Watermarking is an effective means to protect the copyright of images. Using PHP to add watermarks is one of the common ways. However, when text garbled problems occur, you need to carefully examine the cause and take appropriate measures to solve the problem. Through several possible causes and solutions introduced in this article, we can more effectively solve the problem of garbled characters when adding watermarks in PHP.

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