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. 記錄複雜算法或數(shù)學(xué)公式，如復(fù)利計(jì)算；3. 標(biāo)記待辦事項(xiàng)或臨時(shí)修復(fù)，用// TODO:或// FIXME；4. 在公共方法上使用有用且簡潔的PHPDoc說明意圖而非重複語法——總之，當(dāng)他人可能困惑“為什麼這樣寫”時(shí)才註釋，否則保持代碼乾淨(jìng)。

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 (eg, 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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