Solution to PHP Fatal error: Call to undefined function imagettftext()

PHP is a commonly used server-side scripting language that is open source and easy to learn and use. In PHP applications, we often use image processing related functions. However, when we call the imagettftext() method, sometimes the error message "PHP Fatal error: Call to undefined function imagettftext()" appears. This error message means that the imagettftext() method was not found in PHP, so the image processing task cannot be performed normally. This article will focus on the causes and some solutions to this error message.

1. Cause Analysis

When the error message "PHP Fatal error: Call to undefined function imagettftext()" appears, it is probably because your PHP running environment does not have It is caused by a mismatch in the installation of the GD library or the version of the GD library. The GD library is an image processing library that provides a set of interfaces for image processing operations, such as splicing images, cropping, and rotating. imagettftext() is a method provided by the GD library distribution, which can be used to draw TrueType font text on the image.

2. GD library installation

The installation of GD library is very simple. If you are in a Windows environment, you can find the extension=php_gd2.dll line in the php.ini file. Make sure that this line is not commented out and that the DLL file has been placed in the PHP ext directory. If you are in a Linux environment, you can use the following command to install the GD library:

CentOS/RHEL 6:

yum install php-gd

CentOS/RHEL 7:

yum install php-gd

Debian/Ubuntu：

sudo apt-get install php-gd

After the installation is complete, restart the Apache server or PHP -FPM service.

3. GD library version matching

If you have installed the GD library, but the error message "PHP Fatal error: Call to undefined function imagettftext()" still appears , may be caused by a mismatch in PHP's GD library version. In PHP 5.6 and PHP 7.x versions, the default version of the GD library is 2.x. If you are using an old GD library version in PHP 7.x, this error message may appear. If you are using an older version of the GD library, please update to version 2.x.

4. PHP Configuration

If you have installed the GD library but still get the error message "PHP Fatal error: Call to undefined function imagettftext()", then maybe It is caused by PHP configuration problem. Please make sure you enable the GD library extension in the php.ini file and set the following options:

[gd]
extension=gd.so
gd.jpeg_ignore_warning=1

If you are using PHP-FPM, you need to set the following options for the PHP-FPM service in the php-fpm.conf file:

extension=gd.so

Restart Apache Or after PHP-FPM is served, execute the program again to see if the error message still appears.

5. Conclusion

The above are the reasons and solutions for the "PHP Fatal error: Call to undefined function imagettftext()" error message. If you encounter this problem, please follow the above methods to troubleshoot the problem one by one. If there are other methods, please leave a message in the comment area.

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