comprobar extension fileinfo PECL

[viktoria]

Muchissimas gracias!
Esta es la lista
[0] => libxml
[1] => xml
[2] => wddx
[3] => tokenizer
[4] => sysvshm
[5] => sysvsem
[6] => sysvmsg
[7] => session
[8] => pcre
[9] => SimpleXML
[10] => sockets
[11] => SPL
[12] => shmop
[13] => standard
[14] => Reflection
[15] => pspell
[16] => posix
[17] => iconv
[18] => hash
[19] => gmp
[20] => gettext
[21] => ftp
[22] => filter
[23] => exif
[24] => date
[25] => curl
[26] => ctype
[27] => calendar
[28] => bz2
[29] => zlib
[30] => openssl
[31] => apache2handler
[32] => bcmath
[33] => dbase
[34] => dom
[35] => gd
[36] => imap
[37] => json
[38] => mbstring
[39] => mysql
[40] => mysqli
[41] => PDO
[42] => pdo_mysql
[43] => pdo_pgsql
[44] => pdo_sqlite
[45] => pgsql
[46] => xmlreader
[47] => xmlwriter
[48] => xsl
[49] => zip
[50] => ionCube Loader
)
Veo que no tengo esta extension instalada.
Como en el hosting hacen la vista gorda a tal cosa me pregunto si existe otro modo de averiguar mime type o tipo de fichero con 5.2.6 pasando como parametro un fichero con el nombre temporal? O sea que no puedo utilizar explode ya que el nombre no tiene ni coma ni extension?

Gracias por adelantado.