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What could be causing the "Call to undefined function: pdf_open_memory_image()" error in PHP?

The "Call to undefined function: pdf_open_memory_image()" error in PHP is likely caused by the missing or disabled PDF functions in the PHP installation. To solve this issue, you need to enable the PDF extension in your PHP configuration file (php.ini) or install the necessary PDF libraries.

php 
```php
// Enable PDF extension in php.ini file
extension=pdf.so
```
Make sure to restart your web server after making changes to the php.ini file.

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