install imap php

sudo yum install php-imap

aptitude install php5-imap




php.ini file

[imap]
; rsh/ssh logins are disabled by default. Use this INI entry if you want to
; enable them. Note that the IMAP library does not filter mailbox names before
; passing them to rsh/ssh command, thus passing untrusted data to this function
; with rsh/ssh enabled is insecure.
imap.enable_insecure_rsh=1