選擇GET還是POST取決於數(shù)據(jù)傳遞方式、安全性及操作類型。 1. GET通過(guò)URL傳輸數(shù)據(jù)，可見且易被篡改，適合無(wú)敏感信息的場(chǎng)景；POST將數(shù)據(jù)放在請(qǐng)求體中，更隱蔽，適合提交敏感信息。 2. GET支持書籤和緩存，適用於搜索、過(guò)濾等不改變服務(wù)器狀態(tài)的操作；POST不被默認(rèn)緩存或書籤，適合登錄、上傳文件、創(chuàng)建或修改數(shù)據(jù)。 3. GET受URL長(zhǎng)度限制，通常不超過(guò)2048字符，不適合大量數(shù)據(jù)或二進(jìn)制內(nèi)容；POST通過(guò)請(qǐng)求體發(fā)送數(shù)據(jù)，無(wú)此限制。 4. POST比GET更安全，但兩者都需HTTPS加密才能真正保障安全，涉及密碼或個(gè)人信息時(shí)應(yīng)使用POST。

When you're working with PHP forms, the difference between GET and POST comes down to how data is sent from the form to the server. Both methods do the job of passing form data, but they behave differently in terms of visibility, caching, bookmarks, and security.

Here's a practical breakdown of when and why you'd choose one over the other.

1. How Data Is Sent: GET vs POST

With GET , form data is appended to the URL as query parameters. You've probably seen URLs like this:

 http://example.com/page.php?name=John&email=john@example.com

That's what happens when you use method="get" in your form — everything shows up in the address bar.

On the other hand, POST sends the data behind the scenes. It doesn't show up in the URL, which makes it more discreet and suitable for sensitive information (though not fully secure — more on that later).

So if you don't want users seeing or tampering with the submitted values easily, go with POST .

2. Bookmarking and Caching Behavior

If you use GET , the form data becomes part of the URL. That means users can bookmark or share the resulting page — sometimes useful, but also risky if the form submission changes something on the server.

For example:

• A search form using GET is fine because you want users to be able to save or share their search results.
• But if you're deleting a user account or updating a database record via a form, using GET could lead to accidental actions if someone clicks a saved link.

POST requests aren't cached or bookmarked by default, so they're safer for operations that have side effects.

Use GET for:

• Filtering content
• Search queries
• Anything that doesn't change server state

Use POST for:

• Submitting login details
• Uploading files
• Creating or modifying data

3. Data Length and Type Limitations

There's a practical limit to how much data you can send with GET . Since it's part of the URL, browsers and servers impose length restrictions (often around 2048 characters). So if your form has a lot of fields or allows long text input (like a comment box), GET might not work reliably.

POST doesn't have this limitation. It sends data in the HTTP body, so you can pass much larger amounts without hitting those limits.

Also, GET only handles ASCII characters well. If you need to support special characters or binary data (like file uploads), POST is the way to go — especially when combined with enctype="multipart/form-data" .

4. Security Considerations

While POST is more private than GET , neither method should be considered fully secure. Both can be intercepted or manipulated if the connection isn't encrypted (ie, no HTTPS).

However, since GET exposes data in the URL:

• It can be logged in browser history
• It may appear in server logs or referrer headers
• It's easier to guess or spoof manually

So for things like passwords or personal info, always use POST . And remember: real security comes from HTTPS, validation, and sanitization — not just the request method.

In short, choose GET when the action is safe, idempotent, and meant for retrieving data. Use POST when you're submitting sensitive info or making changes on the server.

基本上就這些。

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