大约有 3,300 项符合查询结果（耗时：0.0109秒） [XML]
Can I use a hash sign (#) for commenting in PHP?
...ine because it is also a comment. Example:
#!/usr/bin/php
<?php
echo "Hello PHP\n";
If you store it in an executable file you can then run it from a terminal like this
./hello
The output is
Hello PHP
However, this reasoning is incorrect, as the following counterexample shows:
#!/usr/b...
In PHP, what is a closure and why does it use the “use” identifier?
...for PHP.
Without use, function cannot access parent scope variable
$s = "hello";
$f = function () {
echo $s;
};
$f(); // Notice: Undefined variable: s
$s = "hello";
$f = function () use ($s) {
echo $s;
};
$f(); // hello
The use variable's value is from when the function is defined, n...
What is the difference between “#!/usr/bin/env bash” and “#!/usr/bin/bash”?
... my system. A script containing just this single line: #!/usr/bin/env echo Hello complains: /usr/bin/env: echo Hello: No such file or directory. Apparently it treats echo Hello as a single argument to /usr/bin/env.
– Keith Thompson
May 30 '14 at 14:44
...
Create a custom event in Java
...java.util.*;
// An interface to be implemented by everyone interested in "Hello" events
interface HelloListener {
void someoneSaidHello();
}
// Someone who says "Hello"
class Initiater {
private List<HelloListener> listeners = new ArrayList<HelloListener>();
public void ad...
How do I print bold text in Python?
...'\033[1m'
UNDERLINE = '\033[4m'
END = '\033[0m'
print(color.BOLD + 'Hello World !' + color.END)
share
|
improve this answer
|
follow
|
...
Use dynamic variable names in JavaScript
...
This is an example :
for(var i=0; i<=3; i++) {
window['p'+i] = "hello " + i;
}
alert(p0); // hello 0
alert(p1); // hello 1
alert(p2); // hello 2
alert(p3); // hello 3
Another example :
var myVariable = 'coco';
window[myVariable] = 'riko';
alert(coco); // display : riko
So, the valu...
Python Dictionary Comprehension
... occurrence of words in a list using dictionary comprehension
my_list = ['hello', 'hi', 'hello', 'today', 'morning', 'again', 'hello']
my_dict = {k:my_list.count(k) for k in my_list}
print(my_dict)
And the result is
{'again': 1, 'hi': 1, 'hello': 3, 'today': 1, 'morning': 1}
...
PHP - concatenate or directly insert variables in string
...ted string--even if you surround it with braces!
//syntax error!!
//$s = "Hello {trim($world)}!"
//the only option
$s = "Hello " . trim($world) . "!";
share
|
improve this answer
|
...
What underlies this JavaScript idiom: var self = this?
...
alert(that.someprop);
});
}
new MyConstructor({
someprop: "Hello World"
});
share
|
improve this answer
|
follow
|
...
Python's os.makedirs doesn't understand “~” in my path
...r.
NOTE : it will also create folders in path (if required)
srb@srb-pc:~/hello$ ls
srb@srb-pc:~/hello$ python3
>>> from srblib import verify_folder
>>> verify_folder('~/hello/A/B')
>>> exit()
srb@srb-pc:~/hello$ ls
A
srb@srb-pc:~/hello$ ls A
B
srb@srb-pc:~/hello$
Thi...