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Any equivalent to .= for adding to beginning of string in PHP?
...ays isset, no need for this double check. Furthermore, since $chunk is a required parameter of the function, it needs to be passed to the function or PHP will complain. This means this check can be abbreviated to if ($chunk) (to see if it's falsy a.k.a. "empty"). But, if $chunk doesn't contain anyth...
Is calculating an MD5 hash less CPU intensive than SHA family functions?
...s with sphlib, a library of hash function implementations in C (and Java). All implementations are from the same author (me) and were made with comparable efforts at optimizations; thus the speed differences can be considered as really intrinsic to the functions.
As a point of comparison, consider ...
Adding a regression line on a ggplot
... answered Oct 12 '18 at 5:12
qwrqwr
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How to measure time in milliseconds using ANSI C?
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Doesn't this measure cpu time and not wall time?
– krs013
Feb 1 '15 at 4:53
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__attribute__ - C/C++ - 清泛网 - 专注C/C++及内核技术
...用一个带有相同参数值的函数，具体如下：
extern int square(int n) __attribute__ ((const));...
for (i = 0; i < 100; i++ )
{
total += square (5) + i;
}
通过添加__attribute__((const))声明，编译器只调用了函数一次，以后只是直接...
Understanding recursion [closed]
...A binary tree is a tree made of nodes that have exactly two children, typically called "left" and "right"; again the children can be nodes, or null. A root is a node that is not the child of any other node.
Imagine that a node, in addition to its children, has a value, a number, and imagine that we...
String literals and escape characters in postgresql
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Note that on PostgreSQL 9.0 E'testing\\x20double-slash' will evaluate as 'testing\\x20double-slash', so only single-slash approach works for E'string' style literals
– Alexander
Aug 14 '12 at 14:02
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Purpose of ESI & EDI registers?
...hat matches some search criterion (I'm not sure if it's only searching on equality, or what – you can look it up :) )
That's most of what those regs are for.
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Stopping scripters from slamming your website
...r technologies. I work closely with the developers and have talked through all of the answers here (and many other ideas we've had).
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What is private bytes, virtual bytes, working set?
...se values are a reliable indicator of how much memory an executable is actually using, and none of them are really appropriate for debugging a memory leak.
Private Bytes refer to the amount of memory that the process executable has asked for - not necessarily the amount it is actually using. They ...