How to download a single file with php script






















With the Invoke-WebRequest cmdlet, we can provide the credentials that are needed for downloading the files. If you are creating a script that will need to run automatically, then you will need to store the credentials in the script itself. I recommend creating a secure string password and store it in a text file on the computer that is running the script. This cmdlet allows you to queue files, set priority useful for bandwidth limitation , can run in the background and download multiple files asynchronous.

This is the most basic method of downloading a file with BitsTransfer, you only need a source and destination. By default, the download jobs run in the foreground consuming the maximum bandwidth available. You can change this by setting the priority of the job:. Another option is to run the download job asynchronous , allowing you to start multiple download jobs at the same time.

As you can see I have downloaded the same bin file as before. But if we look in the destination folder we only see a. To download multiple files with PowerShell we first need to know which files are available. We can use the Invoke-WebRequest cmdlet first to get the content from the webpage. This will return not only the content of the webpage but also other properties, like Links and InputFields. We can filter the links with a simple like query and select only the href property from each link.

So we now have the links for all random binary files. All we need to do is download each one of them. It allows you to download multiple files simultaneously in the background with the parameter -Asynchronous. Other advantages of the BitsTransfer cmdlet is it can handle connection interruptions and is aware of your network bandwidth usage. We can start all the download jobs by using the parameter — Asynchronous. Without it, the BitsTransfer cmdlet downloads the first file completely before starting the next download while putting your script on hold in the meantime.

You can use the Get-BitTransfer cmdlet to show the progress of the download. If you want to stop the download job then use the Remove-BitTransfer cmdlet. If such kind of file is stored in a public accessible folder, you can just create a hyperlink pointing to that file, and whenever a user click on the link, browser will automatically downloads that file.

Clicking a link that points to a PDF or an Image file will not cause it to download to your hard drive directly. It will only open the file in your browser. Further you can save it to your hard drive. However, zip and exe files are downloaded automatically to the hard drive by default. You can force images or other kind of files to download directly to the user's hard drive using the PHP readfile function. This function can take three arguments. The first argument is mandatory, and the other two arguments are optional.

This function returns the number of bytes read from the file mentioned in the first argument. The uses of this function are shown in the following two examples. In this example, we will create an HTML file with the following code, where the file name will be passed as a parameter of the URL named path , and the value of this parameter will be passed to the PHP file named download.

We will create the PHP file with the following code to download the file forcibly. Next, the header function is used to set the necessary header information before using the readfile function.

The basename function is used to retrieve the filename, and the filesize function is used to read the size of the file in bytes, which will be shown in the opening dialog box to download the file. The flush function is used to clear the output buffer. The readfile function is used with the filename only, here. Output The following output will appear after clicking the download link of the image file. The file size of the rose.

You can download the file by selecting the Save File radio button and pressing the OK button.



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