


A simple example of uploading images using PHP similar to AJAx_PHP tutorial
We often go on some websites, such as when writing an online resume, and we will find that if we select our picture, it will be immediately displayed on the current page. We often think that this kind of thing can only be realized by ajax. Today I studied a little and found that this kind of thing is not realized by ajax.
In the end, we used our basic knowledge of FORM in HTML to implement uploading. Okay, now I will write down what I know for study purposes. Of course, these are just my own study notes. If there are any mistakes, I hope colleagues can give me some pointers.
First of all, let’s make it clear that when uploading images, we still use
But how can I display the uploaded images without refreshing? Here we need to have an understanding of .
Friends who have used this tag know that it can divide your page into several parts, and each part can have its own URL, that is, several different pages can be displayed. At this point, maybe some friends already know what this is about. Yes, this principle is used to upload pictures. It looks like they are on the same page without jumping, but in fact it has already jumped, but we didn't see it. Okay, here is a simple example, I hope it will be helpful to everyone. (php+html)
The first is the index.php page, the code is as simple as follows:
The code is as follows
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Copy code
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Then there is the hello.php page, which is the page where images are uploaded
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PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

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PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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