大约有 31,600 项符合查询结果（耗时：0.0490秒） [XML]
Looking for a clear definition of what a “tokenizer”, “parser” and...
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A tokenizer breaks a stream of text into tokens, usually by looking for whitespace (tabs, spaces, new lines).
A lexer is basically a tokenizer, but it usually attaches extra context to the tokens -- this token is a number, that token is a string literal, this other token is a...
Can I use a hash sign (#) for commenting in PHP?
...HP file using hashes ( # ) for commenting. But today I realized that I actually can! I'm assuming there's a reason why everybody uses // instead though, so here I am.
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What are the differences between git remote prune, git prune, git fetch --prune, etc
...frustrated about this. The best way to look at is this. There are potentially three versions of every remote branch:
The actual branch on the remote repository
(e.g., remote repo at https://example.com/repo.git, refs/heads/master)
Your snapshot of that branch locally (stored under refs/remotes/...
Sqlite: CURRENT_TIMESTAMP is in GMT, not the timezone of the machine
...me is wanted (I, for example, store local time in one of my database since all I care is what time in the day is was and I don't keep track of where I was in term of time zones...), you can define the column as
"timestamp" TEXT DEFAULT (strftime('%Y-%m-%dT%H:%M','now', 'localtime'))
The %Y-%m-%d...
Using an integer as a key in an associative array in JavaScript
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@bobince: Internally, sure. However, logically, arrays have integer "keys".
– Lightness Races in Orbit
Nov 17 '12 at 22:53
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Who is listening on a given TCP port on Mac OS X?
...y version of macOS supports this:
sudo lsof -iTCP -sTCP:LISTEN -n -P
Personally I've end up with this simple function in my ~/.bash_profile:
listening() {
if [ $# -eq 0 ]; then
sudo lsof -iTCP -sTCP:LISTEN -n -P
elif [ $# -eq 1 ]; then
sudo lsof -iTCP -sTCP:LISTEN -n -P | gre...
What does the variable $this mean in PHP?
I see the variable $this in PHP all the time and I have no idea what it's used for. I've never personally used it.
10 An...
Design patterns or best practices for shell scripts [closed]
...first suggestion is "don't". The reason is that is fairly easy to make a small mistake that hinders your script, or even make it dangerous.
That said, I don't have other resources to pass you but my personal experience.
Here is what I normally do, which is overkill, but tends to be solid, although...
Object reference not set to an instance of an object.Why doesn't .NET show which object is `null`?
...ull
IL_0002: stloc.0 // s
IL_0003: ldloc.0 // s
IL_0004: callvirt System.String.get_Length
IL_0009: call System.Console.WriteLine
It is the callvirt opcode that throws the NullReferenceException and it does that when the first argument on the evaluation stack is a null ...
How do you remove an array element in a foreach loop?
... Please see @Neils answer. You will encounter unexpected bugs, especially if you work with Array of stdClasses. Do you like unexpected behavior? Me not.
– happy_marmoset
Sep 14 '16 at 11:44
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