Installation

PHP 5.3.0, 5.3.1 and 5.3.2 do not have SNMP
support. SNMP support has been restored in PHP 5.3.3.

The Windows distribution of Net-SNMP contains
support files for SNMP in the mibs
directory. This directory should added to Windows’ environment
variables, as MIBDIRS, with the value being the full path to the
mibs directory: e.g. c:\usr\mibs.

Important notes for PHP prior to 5.4.0: In order to
use the UCD SNMP package, you
need to define NO_ZEROLENGTH_COMMUNITY to 1
before compiling it. After configuring UCD SNMP, edit
config.h or acconfig.h and search for
NO_ZEROLENGTH_COMMUNITY. Uncomment the #define
line. It should look like this afterwards:

#define NO_ZEROLENGTH_COMMUNITY 1

Now compile PHP –with-snmp[=DIR] .

If you see strange segmentation faults in
combination with SNMP commands, you
did not follow the above instructions. If you do not want to
recompile UCD SNMP, you can
compile PHP with the –enable-ucd-snmp-hack switch which
will work around the misfeature.