Two ways to upload images in PHP, _php tutorial

Two kinds of PHP implementation of image upload method,

Image uploads are often used in projects, and few items can be detached from images or file uploads. I'm here to introduce you to two kinds of conventional upload methods. (Note: Here we are only the implementation of the function, not to do too many front-end style)
First, using form form to upload
This is the most primitive way to upload, the front end is a simple form form, back end we have PHP processing transmitted over the file.
First look at the front-end code upload.html

Then create a new PHP file handle.php code as follows

$file = $_files[' file '];//gets the transmitted data//Gets the file name $name = $file [' name ']; $type = Strtolower (substr ($name, Strrpos ($name, '. ') +1)); Get the file type and convert it to lowercase $allow_type = array (' jpg ', ' jpeg ', ' gif ', ' PNG '); Defines the type of upload allowed//Determines whether the file type is allowed to upload if (!in_array ($type, $allow _type)) {  //If not allowed, then directly stop the program to run  return;} Determine if the IF (!is_uploaded_file ($file [' tmp_name ']) upload is uploaded via http POST {  //If the return is not uploaded via HTTP post  ;} $upload _path = "d:/now/"; Upload file path//Start move file to the appropriate folder if (Move_uploaded_file ($file [' Tmp_name '], $upload _path. $file [' name ']) {  echo ") Successfully! ";} else{  echo "failed!";}

Of course, this PHP processing code is not very perfect, where the error situation is not processed, but the use of PHP processing upload file principle is this, we can optimize on this basis, so that it is more perfect.
Second, using uploadify to achieve no refresh and with progress bar upload
First download the Uploadify plugin, save it under a folder in your project, and then introduce three files

Then reference the following code

Styles are as follows

Of course, the style of this button I changed, you can modify the style file according to your needs, change the style of this button
The same PHP code handle.php

$file = $_files[' Filedata '];//gets the transmitted data//Gets the file name $name = $file [' name ']; $type = Strtolower (substr ($name, Strrpos ($name, '. ') +1)); Get the file type and convert it to lowercase $allow_type = array (' jpg ', ' jpeg ', ' gif ', ' PNG '); Defines the type of upload allowed//Determines whether the file type is allowed to upload if (!in_array ($type, $allow _type)) {  //If not allowed, then directly stop the program to run  return;} Determine if the IF (!is_uploaded_file ($file [' tmp_name ']) upload is uploaded via http POST {  //If the return is not uploaded via HTTP post  ;} $upload _path = "d:/now/"; Upload file path//Start move file to the appropriate folder if (Move_uploaded_file ($file [' Tmp_name '], $upload _path. $file [' name ']) {  echo ") Successfully! ";} else{  echo "failed!";}

The above two ways to upload can be said that the principle of PHP processing is the same, but the foreground display of different styles, the second way is no refresh, and with the return value, you can easily do other processing. Although commonly used, but will always be restricted, use is not very flexible.
With the development of HTML5 more and more mature, we can use some of the methods in H5 to achieve the upload function, the background PHP processing code is completely different from the above two ways, and use is very flexible. Due to space limitations, this article I do not introduce this way, interested can refer to the PHP+HTML5 implementation of non-refresh image upload Tutorial , I hope you will like.

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