使用freebsd base的bsnmpd做流量統計。
修改 /etc/rc.conf，開機時會自動跑 bsnmpd：
bsnmpd_enable="YES"
修改/etc/snmpd.conf
# Change this!
read := "public"
# open standard SNMP ports
begemotSnmpdPortStatus.[$(host)].161 = 1
begemotSnmpdPortStatus.127.0.0.1.161 = 1
預設只有在127.0.0.1和$(host)有listen
如果是從別台server來抓資料，要加上別的interface IP
begemotSnmpdPortStatus.192.168.1.254.161 = 1
2007/11/12
2007/07/24
10 Tips That Every PHP Newbie Should Know
10 Tips That Every PHP Newbie Should Know
Jeffery Vaska
Tip 6: Single and double quotes
Single and double quotes confused me for some time and it really should not have. I see this quite often in the forum as well. It's very easy to understand that double quotes allow php to parse and single quotes do not. Here are some examples:
$var = $value; // ok
$var = "$value"; // ok, but double quotes are not necessary
$var = '$value'; // will not work (single quotes will not allow parsing)
('.' the period adds/connects variables, functions, etc. together.
Oftentimes programmers will leave spaces around the ' . ' to make
things easier to read.)
$var = 'This is the ' . $value . ' of things.'; // ok - preferred
technique
$var = "This is the $value of things."; // ok, but harder to read/debug
$var = 'This is the $value of things.'; // will not parse $value
$var = This is the $value of things.; // error
$var = $array['name']; // ok, generally the preferred technique
$var = $array["name"]; // ok, but why use double quotes if they are not
necessary?
$var = "$array[name]"; // ok, but harder to read/debug - poor coding
style
$var = 'Name: ' . $array['name']; // ok - preferred technique
$var = "Name: $array[name]"; // ok, but harder to read/debug - poor
coding style
$var = "Name: $array["name"]"; // error
$var = "Name: $array['name']"; // error
exampleFunction($value); // ok
exampleFunction("$value"); // ok, but double quotes are not necessary
exampleFunction('$value'); // will not parse $value
http://www.phpbuilder.com/columns/vaska20050722.php3?aid=948
http://www.phpbuilder.com/columns/vaska20050812.php3
Jeffery Vaska
Tip 6: Single and double quotes
Single and double quotes confused me for some time and it really should not have. I see this quite often in the forum as well. It's very easy to understand that double quotes allow php to parse and single quotes do not. Here are some examples:
$var = $value; // ok
$var = "$value"; // ok, but double quotes are not necessary
$var = '$value'; // will not work (single quotes will not allow parsing)
('.' the period adds/connects variables, functions, etc. together.
Oftentimes programmers will leave spaces around the ' . ' to make
things easier to read.)
$var = 'This is the ' . $value . ' of things.'; // ok - preferred
technique
$var = "This is the $value of things."; // ok, but harder to read/debug
$var = 'This is the $value of things.'; // will not parse $value
$var = This is the $value of things.; // error
$var = $array['name']; // ok, generally the preferred technique
$var = $array["name"]; // ok, but why use double quotes if they are not
necessary?
$var = "$array[name]"; // ok, but harder to read/debug - poor coding
style
$var = 'Name: ' . $array['name']; // ok - preferred technique
$var = "Name: $array[name]"; // ok, but harder to read/debug - poor
coding style
$var = "Name: $array["name"]"; // error
$var = "Name: $array['name']"; // error
exampleFunction($value); // ok
exampleFunction("$value"); // ok, but double quotes are not necessary
exampleFunction('$value'); // will not parse $value
http://www.phpbuilder.com/columns/vaska20050722.php3?aid=948
http://www.phpbuilder.com/columns/vaska20050812.php3
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