fileinfo function PHP - php

Question

Can someone give me an example of how to use fileinfo, to replace a snippet of code such as:
($_FILES["fileToUpload"]["type"] == "image/gif"
|| $_FILES["fileToUpload"]["type"] == "image/jpeg"
|| $_FILES["fileToUpload"]["type"] == "image/png")

Answer 1

Using this:
$finfo = new finfo();
$fileinfo = $finfo->file($file, FILEINFO_MIME);
$fileinfo should contain the correct MIME type which you would be able to use in a snippet like that, or in a switch statement like:
switch($fileinfo) {
case "image/gif":
case "image/jpeg":
case "image/png":
// Code
break;
}

Answer 2

$objInfo = new finfo(FILEINFO_MIME);
list($strImageType, $strCharset) = $objInfo->file($_FILES['fileToUpload']['tmp_name']);
//then use the variable $strImageType in your conditional
if ($strImageType == "image/gif" || $strImageType == "image/jpeg" || $strImageType == "image/png") {
//code
}

Answer 3

Use FILEINFO_MIME_TYPE
$filename = 'example.jpeg';
// Get file info
$finfo = new finfo();
$fileinfo = $finfo->file($filename); // return JPEG image data, JFIF standard 1.01, resolution (DPI), density 72x72, segment length 16, progressive, precision 8, 875x350, frames 3
$info = $finfo->file($filename, FILEINFO_MIME); // return 'image/jpeg; charset=binary'
$type = $finfo->file($filename, FILEINFO_MIME_TYPE); // return 'image/jpeg'
switch($type)
{
case 'image/jpg':
case 'image/jpeg':
// code...
break;
case 'image/gif':
// code...
break;
case 'image/png':
// code...
default:
// error...
break;
}