What does the error "Parse error: parse error, unexpected $" in PHP code indicate?

The error "Parse error: parse error, unexpected $" in PHP code indicates a syntax error caused by an unexpected dollar sign ($) in the code. This typically happens when a variable is not properly declared or used in the code. To fix this error, ensure that all variables are properly declared with a dollar sign ($) before their name.

// Incorrect code causing the parse error
$variable = value;
// Corrected code
$variable = $value;