PHP cannot upload files

I cannot upload files via php (selinux=enabled;policy=targeted).
php shows this error:
*Warning*: File upload error - unable to create a temporary file in 
*Unknown* on line *0
*And in dmesg I found this error:
audit(1100940427.918:0): avc:  denied  { write } for  pid=9202 
exe=/usr/sbin/httpd name=tmp dev=hda3 ino=24 
scontext=root:system_r:httpd_t tcontext=root:object_r:root_t tclass=dir