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Why is PHP's Fileinfo Function Returning an 'Undefined Function' Error?

Linda Hamilton

Nov 08, 2024 am 08:33 AM

Why is PHP's Fileinfo Function Returning an

PHP's Fileinfo Function Returns an Error Message: 'Undefined Function'

When attempting to retrieve the mime content type in PHP, an error message appears, indicating that the 'finfo' class or 'finfo_open' function is not recognized. The accompanying code does not seem to work either.

Root of the Issue:

The cause of this issue lies in the PHP configuration. Specifically, the fileinfo extension is not properly enabled.

Resolution:

Locate the php.ini File: Find the php.ini configuration file on your system. Its location varies depending on the operating system and PHP version.
Enable the Fileinfo Extension: Search for a line similar to "extension=fileinfo.so" (Windows) or "extension=php_fileinfo.dll" (Unix/Linux). If this line is present, uncomment it by removing the semicolon.
Restart PHP: Once the extension is enabled, restart your PHP web server or process to load the new configuration.
Retest the Code: The fileinfo function should now work as intended. Retest your code and verify that it can determine the mime content type successfully.

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