PHP下解決Cannot find module (IP-MIB)的問題

現象

最近工作中給公司的系統中增加了一些網絡有關的功能，它是基于GatewayWorker的，啟動后報告類似如下的錯誤信息：
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 (SNMP-VIEW-BASED-ACM-MIB): At line 0 in (none)
Cannot find module (SNMP-COMMUNITY-MIB): At line 0 in (none)
Cannot find module (NET-SNMP-EXTEND-MIB): At line 0 in (none)
Cannot find module (UCD-DLMOD-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)

原因

根據錯誤信息和網上找到的資料，說是沒有開啟php_snmp.dll這個擴展，但是查看PHP.ini，發現該擴展其實是打開的，進一步深入分析，確認應該是本機沒有安裝net-SNMP。

解決

到net-SNMP下載一個安裝包，注意只有32位的，不過64位機器上也可以用。運行該安裝包使用默認路徑安裝完畢后，確認PHP.ini中開啟了php_snmp.dll，重新啟動GatewayWorker，問題解決。