What is the reason why php imagettftext is garbled? How to deal with it?

In PHP, we can draw the text in the TrueType font file on the image through the imagettftext() function. Although this function is very convenient, sometimes we encounter the problem of imagettftext garbled characters, that is, the text displayed on the image is inconsistent with what is defined in the original font file, which will seriously affect our application experience.

In this article, we will explore the reasons why imagettftext is garbled and how to solve this problem.

1. The reason why imagettftext is garbled

The reason why imagettftext is garbled is more complicated. Sometimes it may be because the font file is incompatible with the system, and sometimes it may be a version problem of the PHP image library. The following are possible reasons why imagettftext is garbled:

1. The font file is incompatible with the system: TrueType font files are created by font designers and are sometimes incompatible with different systems such as Windows and Linux.

2.PHP image library version problem: Different versions of the image library may have different support for font files. If your PHP is incompatible with the image library version, the imagettftext() function may also have garbled characters.

3. Problem with the font file itself: Before using the imagettftext() function, you need to ensure that your font file is correctly installed on your system/server.

2. Methods to solve imagettftext garbled characters

Although there may be many reasons for imagettftext garbled characters, we can take some measures to solve this problem.

1. Check the font files

First, we need to make sure that our font files are installed correctly on our system/server. Typically, font files should be placed in your project root directory or a fonts folder within your project directory.

In addition, before using the font file, it is recommended that you try to convert it to .ttf format and check whether there are special characters through the command line or a font editor (such as FontForge), which may cause images to garbled code problem.

2. Use feasible fonts

After checking the font files, if you still encounter the problem of imagettftext garbled characters, then you can try to use some known feasible font files. These fonts The file has been widely used and proven to work properly. The following are some commonly used font file recommendations:

• Arial
• Verdana
• Times New Roman
• Courier New

3. Use the mb_convert_encoding() function

If your font file is incompatible with the system/server, you can try to use the mb_convert_encoding() function to solve the problem of imagettftext garbled characters.

mb_convert_encoding() function can convert a string from one character encoding to another. Before using the mb_convert_encoding() function, you need to add the path to the font file to the PHP.ini configuration file. The font path can be set using the following line of code:

ini_set('gd.jpeg_ignore_warning', 1);
putenv('GDFONTPATH=' . realpath('.'));

The steps to use the mb_convert_encoding() function are as follows:

1. Use the mb_detect_encoding() function to detect the encoding method of your string:

$str = 'I am a Chinese character';
$encoding = mb_detect_encoding($str);

2. Use the mb_convert_encoding() function to convert the string from the detected encoding to the specified encoding:

$charset = ' UTF-8';
$output = mb_convert_encoding($str, $charset, $encoding);

3. Generate an image and use the imagettftext() function to draw the text on the image:

$img = imagecreatetruecolor(640, 480);
$black = imagecolorallocate($img, 0, 0, 0);
$text = $output;
$font = 'arialbd.ttf' ; //Use Arial font
imagettftext($img, 24, 0, 10, 50, $black, $font, $text);
header('Content-Type: image/png');
imagepng($img);
imagedestroy($img);

The above is a simple example using the mb_convert_encoding() function, you can change it according to your needs.

Conclusion

In practical applications, we often use the imagettftext() function to draw characters on images. This function is very convenient, but sometimes we encounter the problem of garbled imagettftext, which affects our application experience. In this article, we cover the possible causes of garbled imagettftext and how to fix it. We hope this article can help you solve the imagettftext garbled problem and make your application more beautiful and practical.

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