How can proper variable assignment and initialization prevent undefined variable errors in PHP code?

Improper variable assignment and initialization can lead to undefined variable errors in PHP code. To prevent this, always make sure to assign a value to a variable before using it in any operations or conditions. Initializing variables with default values can also help avoid undefined variable errors.

// Incorrect code that may lead to undefined variable error
$number;
$result = $number * 2; // Error: $number is not defined

// Corrected code with proper variable assignment and initialization
$number = 5;
$result = $number * 2; // No error as $number is properly initialized