Fix PHP Fatal Error: Call to Undefined Function (2025 Guide)
Fix PHP Fatal Error: Call to Undefined Function (2025 Guide) Fix PHP Fatal Error: Call to Undefined Function (2025 Guide) Posted on: March 18, 2025 Encountered a "Fatal error: Call to undefined function" in PHP? This error can halt your web app in its tracks. In this 2025 guide, we’ll dive into why it happens and how to fix it with straightforward solutions! What Causes "Fatal Error: Call to Undefined Function" in PHP? This error occurs when PHP tries to call a function that doesn’t exist or isn’t accessible. Here are the main reasons: Typo or Misspelling : You mistyped the function name. Missing Extension : The function belongs to an uninstalled or disabled PHP extension. Scope Issue : The function isn’t defined in the current scope or file. Here’s a simpl...