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Date: Mon, 16 Mar 2026 13:03:51 +0800
Subject: [PHP-DEV] [RFC] SNMP MIB reset function
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From: swilton@fluentit.au (=?utf-8?q?swilton=40fluentit=2Eau?=)

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Hi All,
=C2=A0
I would like to create an RFC proposal to add a new function snmp=5Fini=
t=5Fmib() that will shut down and then re-initialise the MIB tree withi=
n the lib-snmp library. =C2=A0This allows the PHP code to define the SN=
MP environment variables, and then initialise the MIB tree without impo=
rting any MIBs from the global config into the MIB tree.
Another consideration is that the MIB tree persists across FPM requests=
 because the MIB tree is kept as a global structure within SNMP library=
 memory. =C2=A0This proposal would allow the MIB to be reset within a r=
equest if needed.
Something like this function is required if you want to run multiple SN=
MP queries for different MIBs that define the same OIDs differently. =C2=
=A0I have come across a few vendor MIB files where this happens, and th=
e php snmp module cannot work without the ability to reset the MIB tree=
, or without forking an external process for these specific MIBs.
I believe that the process is to send a message to the list, and gauge =
whether there is positive feedback before creating the RFC for voting. =
=C2=A0Please let me know if I should create the RFC first?
The PR is here: https://github.com/php/php-src/pull/21452/changes
regards
Steve

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<html><p>Hi All,<br>&nbsp;<br>I would like to create an RFC proposal to=
 add a new function snmp=5Finit=5Fmib() that will shut down and then re=
-initialise the MIB tree within the lib-snmp library. &nbsp;This allows=
 the PHP code to define the SNMP environment variables, and then initia=
lise the MIB tree without importing any MIBs from the global config int=
o the MIB tree.</p><p>Another consideration is that the MIB tree persis=
ts across FPM requests because the MIB tree is kept as a global structu=
re within SNMP library memory. &nbsp;This proposal would allow the MIB =
to be reset within a request if needed.</p><p>Something like this funct=
ion is required if you want to run multiple SNMP queries for different =
MIBs that define the same OIDs differently. &nbsp;I have come across a =
few vendor MIB files where this happens, and the php snmp module cannot=
 work without the ability to reset the MIB tree, or without forking an =
external process for these specific MIBs.</p><p>I believe that the proc=
ess is to send a message to the list, and gauge whether there is positi=
ve feedback before creating the RFC for voting. &nbsp;Please let me kno=
w if I should create the RFC first?</p><p>The PR is here: <a href=3D"ht=
tps://github.com/php/php-src/pull/21452/changes">https://github.com/php=
/php-src/pull/21452/changes</a></p><p>regards</p><p>Steve</p></html>

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