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In the unlink function is used to remove a file from server and which function you can use to delete file and images from server.
In the unlink function have two parameter used that are string and filename. String Specifies to file path and file name Specifies to want delete file name.
If you need to delete image from in the above script click delete icon. Then immediately which script ask "Are you sure you want to delete this image" message. If you click yes button the image will be delete otherwise image will not delete from server.
Following code is use to unlink to image function if you need to copy and use to your website.
In the above example file_exists() function is used to check image available from server and unlink() function is used to delete an image from server and chmod() is used to give permission to image file.
If you need to unlink image function code click and download from following link.