HighFile-scopePHP Plug & play

Validate array keys before accessing

Use isset()/array_key_exists() or null coalescing (??) before reading array keys that may be absent.

Why this matters

Prevents undefined index notices and documents expected defaults.

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

Avoid

$city = $payload['user']['address']['city'];

Prefer

$city = $payload['user']['address']['city'] ?? 'unknown';

Bad

$v = $a['k'];

Good

$v = $a['k'] ?? null;

From the same buckets as this rule.

Critical
Avoid equality operators in loop termination conditions
Check if loops use equality operators (== or !=) in termination conditions. These can lead to infinite loops if the condition is never met exactly. Instead, use relational operators like < or > for safer loop termination.
error-handlingreadability-refactor
Critical
Avoid Returning Null in Non-Async Task Methods
Returning null from a Task or Task<T> method causes a NullReferenceException if awaited. Use Task.CompletedTask or Task.FromResult<T>(null) instead.
error-handlingreadability-refactor+1
Critical
Avoid Using Boolean Expressions in `except` Statements
Detect `except` clauses that use `or` or `and` to catch multiple exceptions. This does not work as intended. Recommend using a tuple of exceptions instead.
error-handlingstack-python