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snmp2_set

(PHP >= 5.2.0, PHP 7, PHP 8)

snmp2_set — Set the value of an SNMP object

Description

snmp2_set(
    string $hostname,
    string $community,
    array|string $object_id,
    array|string $type,
    array|string $value,
    int $timeout = -1,
    int $retries = -1
): bool

snmp2_set() is used to set the value of an SNMP object specified by the object_id.

Parameters

hostname
The hostname of the SNMP agent (server).
community
The write community.
object_id
The SNMP object id.
type

The MIB defines the type of each object id. It has to be specified as a single character from the below list.

types
=The type is taken from the MIB
iINTEGER
uINTEGER
sSTRING
xHEX STRING
dDECIMAL STRING
nNULLOBJ
oOBJID
tTIMETICKS
aIPADDRESS
bBITS

If OPAQUE_SPECIAL_TYPES was defined while compiling the SNMP library, the following are also valid:

types
Uunsigned int64
Isigned int64
Ffloat
Ddouble

Most of these will use the obvious corresponding ASN.1 type. 's', 'x', 'd' and 'b' are all different ways of specifying an OCTET STRING value, and the 'u' unsigned type is also used for handling Gauge32 values.

If the MIB-Files are loaded by into the MIB Tree with "snmp_read_mib" or by specifying it in the libsnmp config, '=' may be used as the type parameter for all object ids as the type can then be automatically read from the MIB.

Note that there are two ways to set a variable of the type BITS like e.g. "SYNTAX BITS {telnet(0), ftp(1), http(2), icmp(3), snmp(4), ssh(5), https(6)}":

  • Using type "b" and a list of bit numbers. This method is not recommended since GET query for the same OID would return e.g. 0xF8.
  • Using type "x" and a hex number but without(!) the usual "0x" prefix.

See examples section for more details.

value
The new value.
timeout
The number of microseconds until the first timeout.
retries
The number of times to retry if timeouts occur.

Return Values

Returns true on success or false on failure.

If the SNMP host rejects the data type, an E_WARNING message like "Warning: Error in packet. Reason: (badValue) The value given has the wrong type or length." is shown. If an unknown or invalid OID is specified the warning probably reads "Could not add variable".

Examples

Example #1 Using snmp2_set()

<?php
snmp2_set("localhost", "public", "IF-MIB::ifAlias.3", "s", "foo");
?>

Example #2 Using snmp2_set() for setting BITS SNMP object id

<?php
snmp2_set("localhost", "public", 'FOO-MIB::bar.42', 'b', '0 1 2 3 4');
// or
snmp2_set("localhost", "public", 'FOO-MIB::bar.42', 'x', 'F0');
?>

See Also