LowFile-scopePHP Plug & play

Extract duplicated business logic

Move repeated domain calculations/transformations into named functions or service classes; keep controllers/scripts thin.

Why this matters

Single source of truth reduces bugs and improves testability.

Side-by-side examples engineers can pattern-match during review.

Avoid

$total += $item['price'] * $item['qty']; // repeated in multiple files

Prefer

function lineTotal(array $i): float { return $i['price'] * $i['qty']; }
$total = array_sum(array_map('lineTotal', $items));

Bad

$a['p']*$a['q']

Good

function lineTotal($i){ return $i['p']*$i['q']; }

From the same buckets as this rule.

Critical
Avoid Duplicating String Literals
Store repeated string literals in constants or variables to improve maintainability and reduce redundancy.
duplication-complexitymaintainability
Critical
Avoid Redundant `None` Comparisons
Identify cases where `x is None` or `x is not None` is used redundantly when `x` is always or never `None`. This may indicate a deeper logic issue.
duplication-complexityreadability-refactor+1
High
Avoid Functions That Always Return the Same Value
Identify functions that return the same value regardless of input. This may indicate poor design or a logic error.
duplication-complexityreadability-refactor+1