Articles/PHP

"Undefined variable $x" in PHP — What It Means and How to Fix It

What the PHP error "Undefined variable $x" means and how to fix it.

Published October 30, 2026

"Undefined variable $x" occurs when code reads a variable that was never assigned a value in the current scope.

Key points

  • Check the exact file and line number PHP reports — the mistake is often on or just before that line

Example

echo $name;  // Warning: Undefined variable $name
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