Why Checking File Extensions in Array Misfires ?

Php Folks,

Why is this line malfunctioning ?

[code]
if(!array_key_exists($file_extension, $allowed_file_extensions)) die(“Error: Select a valid video file format. Select an Mp4 file.”);
[/code]

I allowed the file type “mp4” and then fed the script (tried uploading) an mp4 file. I should get mssg upload successful but instead get error message:
“Select a valid video file format. Select an Mp4 file.”

Why is that ?

[code]
$file_name = $_FILES[“id_verification_video_file”][“name”];
$file_tmp = $_FILES[“id_verification_video_file”][“tmp_name”];
$file_type = $_FILES[“id_verification_video_file”][“type”];
$file_size = $_FILES[“id_verification_video_file”][“size”];
$file_error = $_FILES[‘id_verification_video_file’][‘error’];

$file_extension = pathinfo($file_name, PATHINFO_EXTENSION);
if(file_exists(“$directory_path . $user/ . $file_name”))
{
$Errors[] = “Error: You have already uploaded a video file to verify your ID!”;
exit();
}
else
{
//Feed allowed File Extensions List.
$allowed_file_extensions = array(‘mp4’);

//Feed allowed File Size.
$max_file_size_allowed_in_bytes = 1024*1024*1; //Allowed limit: 100MB.
$max_file_size_allowed_in_kilobytes = 1024*1;
$max_file_size_allowed_in_megabytes = 1;

$max_file_size_allowed = “$max_file_size_allowed_in_bytes”;

//Create a fileinfo resource.
$finfo = finfo_open(FILEINFO_MIME_TYPE);
//Apply the FileInfo resource and the finfo_file() function to a given file.
$mime = finfo_file($finfo,$file_name);
//Close the fileinfo resource.
finfo_close($finfo);

//Verify File Extension.
if(!array_key_exists($file_extension, $allowed_file_extensions)) die(“Error: Select a valid video file format. Select an Mp4 file.”);
[/code]

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