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List of Big-O for PHP functions
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array_pop/array_push is faster than array_shift/array_unshift due to re-index penalty
Lookups:
array_key_exists O(n) but really close to O(1) - this is because of linear polling in collisions, but because the chance of collisions is very small, the coefficient is also very small. I find you tr...
Tactics for using PHP in a high-load site
...generated, consider writing out html or php to the disk. You could have an index.php page that looks on disk for the article, if it's there, it streams it to the client. If it isn't, it generates the article, writes it to the disk and sends it to the client. Deleting files from the disk would cause ...
Rebuild IntelliJ project indexes
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how do you get intelliJ to only index certain folders?
– FutuToad
Jan 24 '14 at 17:51
3
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How to filter a dictionary according to an arbitrary condition function?
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@Datanovice I'm sure one could. One could also open a new question with sufficient detail to get a more useful answer ;)
– Thomas
May 2 '18 at 14:09
1
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Django - iterate number in for loop of a template
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Django provides it. You can use either:
{{ forloop.counter }} index starts at 1.
{{ forloop.counter0 }} index starts at 0.
In template, you can do:
{% for item in item_list %}
{{ forloop.counter }} # starting index 1
{{ forloop.counter0 }} # starting index 0
# do your st...
Bubble Sort Homework
... Technically, element is not an element; it's a number representing a list index. Also, it's quite long. In these cases, just use a temporary variable name, like i for "index".
for i in range(0, length):
The range command can also take just one argument (named stop). In that case, you get a list o...
std::string截取字符串，截取ip:port - C/C++ - 清泛网 - 专注C/C++及内核技术
...:string截取字符串，截取ip:portstd::string ip("127.0.0.1:8888");int index = ip.find_last_of(':'); 获取ipip.substr(0, index).c_str(); 获取portip.substr(index + 1).c_str();std::string ip("127.0.0.1:8888");
int index = ip.find_last_of(':');
// 获取ip
ip.substr(0, index).c_str();
//...
CString的截取字符串，截取ip:port - C/C++ - 清泛网 - 专注C/C++及内核技术
...如下：CString strIpPort = "127.0.0.1:8888";CString strIp, strPort;int index = strIpPort.Find('...CString截取ip:port，代码如下：
CString strIpPort = "127.0.0.1:8888";
CString strIp, strPort;
int index = strIpPort.Find(':');
if (index > 0)
{
strIp = strIpPort.Left(index);
strPort...
error C2662: “Screen::move”: 不能将“this”指针从“const Screen”转...
...换丢失限定符出错代码： 成员函数定义Screen& Screen::move(index r,index c){ index row = r * width; cursor = row + c;...出错代码：
//成员函数定义
Screen& Screen::move(index r,index c)
{
index row = r * width;
cursor = row + c;
return *this;
}
con...
TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...。
Currently unsupported functionality
● dropDups option for unique indexes
● Background Indexing, the “background” option is ignored when creating indexes.
● Fulltext indexes
● Geospatial indexes
磁盘消耗对比：
选择MongoDB就必然会面对磁盘消耗的问...