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What is the LD_PRELOAD trick?
... ...
libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 (0x00007f3927b1d000)
libacl.so.1 => /lib/x86_64-linux-gnu/libacl.so.1 (0x00007f3927914000)
libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f392754f000)
libpcre.so.3 => /lib/x86_64-linux-gnu/libpcre.so.3...
Remove a string from the beginning of a string
...efix) {
$str = substr($str, strlen($prefix));
}
Takes: 0.0369 ms (0.000,036,954 seconds)
And with:
$prefix = 'bla_';
$str = 'bla_string_bla_bla_bla';
$str = preg_replace('/^' . preg_quote($prefix, '/') . '/', '', $str);
Takes: 0.1749 ms (0.000,174,999 seconds) the 1st run (compiling), and...
How can I get the count of milliseconds since midnight for the current?
...
Do you mean?
long millis = System.currentTimeMillis() % 1000;
BTW Windows doesn't allow timetravel to 1969
C:\> date
Enter the new date: (dd-mm-yy) 2/8/1969
The system cannot accept the date entered.
...
css中使用变量，:root伪元素的使用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
....scss文件
:root {
--theme-color: #fff;
--theme-border-color: #000;
--theme-font-color: #000;
// 这样我们在切换成黑夜模式的时候，只需要给body元素增加一个名为dark的class
// 为什么设置body元素，因为:root代表html，在内一层...
Why aren't variables declared in “try” in scope in “catch” or “finally”?
...eader sr,
[1] class [mscorlib]System.Exception ex)
IL_0000: ldnull
IL_0001: stloc.0
.try
{
.try
{
IL_0002: ldsfld string UsingTest.Class1::path
IL_0007: newobj instance void [mscorlib]System.IO.StreamReader::.ctor...
Checking if an instance's class implements an interface?
...Given an instance of an object
Object construction outside the loop (100,000 iterations)
____________________________________________
| class_implements | Reflection | instanceOf |
|------------------|------------|------------|
| 140 ms | 290 ms | 35 ms |
'---------------------...
Does using “new” on a struct allocate it on the heap or stack?
...terisedCtorAssignToField() cil managed
{
.maxstack 8
L_0001: ldstr ""
L_0006: newobj instance void [mscorlib]System.Guid::.ctor(string)
L_000b: stsfld valuetype [mscorlib]System.Guid Test::field
L_0010: ret
}
.method private hidebysig static ...
how do you filter pandas dataframes by multiple columns
...from @redreamality):
import pandas as pd
import numpy as np
length = 100_000
df = pd.DataFrame()
df['Year'] = np.random.randint(1950, 2019, size=length)
df['Gender'] = np.random.choice(['Male', 'Female'], length)
%timeit df.query('Gender=="Male" & Year=="2014" ')
%timeit df[(df['Gender']=='Ma...
Maximum number of records in a MySQL database table
...
I suggest, never delete data. Don't say if the tables is longer than 1000 truncate the end of the table. There needs to be real business logic in your plan like how long has this user been inactive. For example, if it is longer than 1 year then put them in a different table. You would have this...
Auto-center map with multiple markers in Google Maps API v3
...'5';
else if(maxdifference > 14.222 && maxdifference <= 28.000) //zoom 4
zoomvalue='4';
else if(maxdifference > 28.000 && maxdifference <= 58.000) //zoom 3
zoomvalue='3';
else
zoomvalue='1';
return latitudeMid+'|'+longitudeMid+'|'+zoomvalue;
}
...