ZF-7860: IsImage filter no longer works with fileinfo extension in PHP5.3
This validator doesn't seem to work any more after upgrading to PHP5.3 (which now comes with fileinfo extension built in)
$mime = new finfo(FILEINFO_MIME); $this->_type = $mime->file($value);
file() used to return just "image/jpeg", now it returns "image/jpeg; charset=binary". This no longer matches values in the predefined array and validation fails.