解釋非顯而易見的邏輯，如繞過第三方庫bug或性能優(yōu)化；2. 記錄復(fù)雜算法或數(shù)學(xué)公式，如復(fù)利計算；3. 標(biāo)記待辦事項或臨時修復(fù)，用// TODO:或// FIXME；4. 在公共方法上使用有用且簡潔的PHPDoc說明意圖而非重復(fù)語法——總之，當(dāng)他人可能困惑“為什么這樣寫”時才注釋，否則保持代碼干凈。

You should comment your PHP code when it helps clarify why something is done—not just what is being done. PHP is readable enough that obvious operations (like $total = $price * $quantity;) don’t need comments. But when logic gets tricky, assumptions are made, or business rules are applied, that’s where comments add real value.

1. Explain Non-Obvious Logic

If your code does something clever or unusual—like a workaround for a third-party library bug or a performance optimization—add a comment.

// Skip validation for internal API calls (trusted source)
if ($request->isFromInternalService()) {
    return true;
}

Without that comment, someone might remove the check thinking it’s a security flaw.

2. Document Complex Algorithms or Math

If you’re implementing a formula or algorithm (e.g., tax calculation, pagination logic), a brief explanation helps others (and future you) understand it faster.

// Calculate compound interest: A = P(1   r/n)^(nt)
$amount = $principal * pow(1   ($rate / $compoundsPerYear), $compoundsPerYear * $years);

3. Mark TODOs and Temporary Fixes

Use // TODO: or // FIXME: to flag things that need revisiting.

// TODO: Replace with proper OAuth2 implementation
$token = generateMockToken();

These make technical debt visible without cluttering the codebase.

4. Function/Method-Level DocBlocks (When Useful)

Use PHPDoc for public methods—especially in classes meant for reuse. But keep it concise and accurate.

/**
 * Returns the user's active subscription plan.
 * @return string|null 'premium', 'basic', or null if none
 */
public function getActivePlan()

Avoid auto-generated comments that just repeat the function name. If the method is trivial and the name is clear (getUserEmail()), skip the docblock.

Bottom Line

Comment to explain intent, not syntax.
If another developer would reasonably ask “Why is this here?” or “What’s this doing?”, then comment.
If it’s self-explanatory, leave it clean—noise hurts more than silence.

Basically: when in doubt, ask yourself—would this confuse someone who doesn’t know the context? If yes, write a short, clear note.

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