PHP中使用多行註釋的正確方法是用/開始並以/結(jié)束，註釋內(nèi)容不會被解析器執(zhí)行。例如：/ 這是多行註釋，可寫入詳細(xì)說明/。多行註釋適用於解釋複雜邏輯、文檔化函數(shù)或類、為其他開發(fā)者留備註以及臨時(shí)禁用代碼塊。注意事項(xiàng)包括不可嵌套多行註釋、避免在註釋塊內(nèi)出現(xiàn)多餘的*/。最佳實(shí)踐是保持註釋清晰簡潔，避免冗餘，及時(shí)更新註釋，並可在函數(shù)前使用註釋描述功能、參數(shù)及返回值。

When you're just starting with PHP, understanding how to properly use multiline comments can help make your code cleaner and more maintainable. Unlike single-line comments, which are great for quick notes, multiline comments let you write longer explanations or temporarily disable chunks of code during testing.

How to Write Multiline Comments in PHP

The syntax for multiline comments in PHP is straightforward: you start with /* and end with */ . Anything between those markers is treated as a comment and ignored by the interpreter.

For example:

 /*
This is a multiline comment.
You can write as much as you want here,
and it won't affect how the code runs.
*/
echo "Hello, world!";

This kind of comment is especially useful when you want to explain something complex like a function's purpose or logic that isn't immediately obvious from reading the code.

A few things to watch out for:

• Don't nest /* */ comments inside each other — it can cause errors.
• Be careful when commenting out large blocks of existing code that might contain their own */ somewhere — it could break your comment block unintentionally.

When to Use Multiline Comments

There are a few practical situations where using multiline comments makes sense:

• Documenting functions or classes : You can explain what a function does, its parameters, return values, and any assumptions it relies on.
• Leaving notes for future developers (or yourself) : Sometimes you need to explain why a certain approach was taken, especially if it's not the most obvious solution.
• Temporarily disabling code during testing : Instead of deleting or deleting lines one by one, wrapping a section in /* */ lets you quickly turn it off and back on again.

Just remember — while comments are helpful, too many outdated or unnecessary ones can clutter your code instead of clarifying it.

Best Practices for Writing Clear Comments

Writing good comments is just as important as knowing how to format them. Here are a few tips:

• Keep explanations clear and concise.
• Avoid stating the obvious — for example, // set variable to 5 above $var = 5; doesn't really add value.
• Update comments when the code changes — outdated comments can be misleading.
• If needed, include examples or reasoning behind unusual logic.

One common pattern is using multiline comments before a function definition to describe what it does:

 /*
 * Calculates the total price after tax
 * @param float $price - the base price before tax
 * @param float $taxRate - tax percentage (eg, 8.5 for 8.5%)
 * @return float
 */
function calculateTotal($price, $taxRate) {
    return $price ($price * ($taxRate / 100));
}

This helps anyone reading the code understand how to use the function without digging into its internal logic.

基本上就這些。 Multiline comments aren't complicated, but they're a basic tool every beginner should get comfortable with early on.

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