PHP中常用的注釋方式有三種：//、/ /和#，分別適用于不同的場(chǎng)景。1. 使用//進(jìn)行單行注釋，適合快速說(shuō)明或禁用一行代碼，可放在代碼行上方或右側(cè)；2. 使用/ /進(jìn)行多行注釋，適合長(zhǎng)段說(shuō)明或臨時(shí)禁用多行代碼，但需注意不能嵌套；3. 使用#進(jìn)行類Shell風(fēng)格的單行注釋，較少見(jiàn)，主要用于舊項(xiàng)目或混合腳本。建議多解釋代碼邏輯而非功能，避免冗余，同時(shí)保持注釋與代碼同步更新。

In PHP, comments are used to explain your code or temporarily disable parts of it without deleting anything. They don't affect how the script runs since the PHP interpreter ignores them. There are three common ways to write comments: using //, /* */, and #.

Let’s go over when and how to use each one.

1. Single-line Comments with //

Use // when you want to comment out a single line of code or add a quick note above or beside a line.

• Works for inline explanations
• Also good for disabling one line during testing

// This function adds two numbers
function add($a, $b) {
    return $a   $b;
}

$result = add(5, 3); // Store result in $result

You can also place the comment on the same line as code, like the second example above. Just make sure it doesn’t get too crowded or hard to read.

2. Multi-line Comments with /* */

When you need to write longer explanations or comment out multiple lines, wrap them in /* ... */.

• Useful for documenting blocks of code
• Often used for licensing info or complex logic notes
• Can span multiple lines or even be inside a line

/*
This function calculates tax based on:
- Rate provided (default is 10%)
- Applies only if amount is over $100
*/
function calculateTax($amount, $rate = 0.10) {
    if ($amount > 100) {
        return $amount * $rate;
    }
    return 0;
}

A handy trick: You can also use this syntax to temporarily disable large chunks of code:

/*
echo "This part won't run";
$result = someFunction();
*/

Just remember to make sure there are no nested */ inside the block — that’ll break things.

3. Shell-style Comments with #

The # symbol works just like // — it's for single-line comments.

• Less commonly used than //
• Mostly found in older PHP projects or shell scripts

# This is a comment
$x = 10; # Assigning value to x

Unless you're maintaining legacy code or working with shell scripts mixed with PHP, you’ll probably stick with //. It's more standard in modern PHP development.

A Few Things to Keep in Mind

• Use comments to explain why something is done, not just what it does.
• Don’t overdo it — clean code often speaks for itself.
• Update comments when you update the code, or they become misleading.
• IDEs and editors usually have shortcuts to comment/uncomment blocks quickly (like Ctrl /).

基本上就這些。

以上是如何在PHP代碼中使用評(píng)論？ （//，/ * */，＃）的詳細(xì)內(nèi)容。更多信息請(qǐng)關(guān)注PHP中文網(wǎng)其他相關(guān)文章！