最近因為專案需要使用snmp和網路硬體設備做通訊，所以使用了php_snmp這個模組
修改完php.ini重新啟動服務後出現了許多錯誤訊息：
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MIB search path: c:/usr/share/snmp/mibs
Cannot find module (IP-MIB): At line 0 in (none)
Cannot find module (IF-MIB): At line 0 in (none)
Cannot find module (TCP-MIB): At line 0 in (none)
Cannot find module (UDP-MIB): At line 0 in (none)
Cannot find module (HOST-RESOURCES-MIB): At line 0 in (none)
Cannot find module (SNMPv2-MIB): At line 0 in (none)
Cannot find module (SNMPv2-SMI): At line 0 in (none)
Cannot find module (NOTIFICATION-LOG-MIB): At line 0 in (none)
Cannot find module (UCD-SNMP-MIB): At line 0 in (none)
Cannot find module (UCD-DEMO-MIB): At line 0 in (none)
Cannot find module (SNMP-TARGET-MIB): At line 0 in (none)
Cannot find module (NET-SNMP-AGENT-MIB): At line 0 in (none)
Cannot find module (DISMAN-EVENT-MIB): At line 0 in (none)
Cannot find module (SNMP-VIEW-BASED-ACM-MIB): At line 0 in (none)
Cannot find module (SNMP-COMMUNITY-MIB): At line 0 in (none)
Cannot find module (SNMP-FRAMEWORK-MIB): At line 0 in (none)
Cannot find module (SNMP-MPD-MIB): At line 0 in (none)
Cannot find module (SNMP-USER-BASED-SM-MIB): At line 0 in (none)
Cannot find module (SNMP-NOTIFICATION-MIB): At line 0 in (none)
Cannot find module (SNMPv2-TM): At line 0 in (none)
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原因是因為沒有安裝 SNMP MIB，解法當然是安裝 SNMP MIB，個人是找了 Net-SNMP 這套安裝，安裝完後基本上就可以直接使用了。
如果安裝完後還是不能用的話就自己手動加一個環境變數：
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Variable Name：mibdirs
Variable Value：{Path to Net-SNMP install folder}\share\snmp\mibs (Default Install Path：C:\usr\share\snmp\mibs)
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