Why is this an issue?
Any statement (other than a null statement, which means a statement containing only a semicolon
;) which has no side effect and does
not result in a change of control flow will normally indicate a programming error, and therefore should be refactored.
Noncompliant code example
$a == 1; // Noncompliant; was assignment intended?
$a < $b; // Noncompliant; have we forgotten to assign the result to a variable?