Unknown argument on a function on github

Question

I found a good function on github for uploading images using php, but I do not know one of its arguments.

upload_image($_FILES,'file',250,'city',500,'../../uploaded/',1048576);

Function on Github

1. What is 'file' in this function?
2. Is this a trusted function to use in my website?

Answer 1

Considering the lines:

$file[$fileIndex]['tmp_name']
$file[$fileIndex]['error']
$file[$fileIndex]['name']
$file[$fileIndex]['type']
$file[$fileIndex]['size']

$file is a three-dimensional array, composed of arrays of name, tmp_name, type, size, error.
It is the kind of array you see when uploading files in PHP.

It calls move-uploaded-file, which moves an uploaded file to a new location.

This function checks to ensure that the file designated by filename is a valid upload file (meaning that it was uploaded via PHP's HTTP POST upload mechanism).
If the file is valid, it will be moved to the filename given by destination.