is_uploaded_file() blanks picture file when it is .bmp, why?

Question

When I upload any file everything looks good. I have those pictures in pics folder. The unknown part is when I upload a bmp file. I check file types to see if they are jpg,gif, etc. But code doesn't reach there.
I've also echoed $_FILES['upload'] it was as below:

Array
(
    [name] => picture.bmp
    [type] => 
    [tmp_name] => 
    [error] => 1
    [size] => 0
)

The code is:

if( is_uploaded_file( $_FILES['upload']['tmp_name'] ) ) 
{
       // it does not reach here when it is bmp.
}

bmp file size is about 2.5MB and upload_max_filesize = 5M in PHP.ini. I didn't have this issue before. Is there something here I'm doing wrong?

Answer 1

Error 1 means:

The uploaded file exceeds the upload_max_filesize directive in php.ini.

Perhaps you edited the wrong php.ini, or the directive is changed with an ini_set later on. To be sure, do a phpinfo() right before the upload processing code.

Answer 2

See php upload error codes
As per php documentation

UPLOAD_ERR_INI_SIZE

Value: 1; The uploaded file exceeds the upload_max_filesize directive in php.ini.