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Running shell command and capturing the output
...ll execute a shell command and return its output as a string , no matter, is it an error or success message. I just want to get the same result that I would have gotten with the command line.
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Create empty file using python [duplicate]
...directory version of os.mkdir , but I haven't been able to find anything. Is there a tool like this to create a file without opening it, or using system or popen/subprocess?
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How can I distinguish whether Switch,Checkbox Value is changed by user or programmatically (includin
How to implement method isNotSetByUser() ?
16 Answers
16
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How to get everything after a certain character?
...whatIWant;
If you also want to check if the underscore character (_) exists in your string before trying to get it, you can use the following:
if (($pos = strpos($data, "_")) !== FALSE) {
$whatIWant = substr($data, $pos+1);
}
...
PHP validation/regex for URL
...
I used this on a few projects, I don't believe I've run into issues, but I'm sure it's not exhaustive:
$text = preg_replace(
'#((https?|ftp)://(\S*?\.\S*?))([\s)\[\]{},;"\':<]|\.\s|$)#i',
"'<a href=\"$1\" target=\"_blank\"&...
Why do I need to override the equals and hashCode methods in Java?
Recently I read through this
Developer Works Document .
29 Answers
29
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Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
I am trying to determine the best time efficient algorithm to accomplish the task described below.
16 Answers
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How can I override the OnBeforeUnload dialog and replace it with my own?
...on() {
return 'You have unsaved changes!';
}
Here's a reference to this from Microsoft:
When a string is assigned to the returnValue property of window.event, a dialog box appears that gives users the option to stay on the current page and retain the string that was assigned to it. The def...
difference between primary key and unique key
...able
In some DBMS it cannot be NULL - e.g. MySQL adds NOT NULL
Primary Key is a unique key identifier of the record
Unique Key:
Can be more than one unique key in one table
Unique key can have NULL values
It can be a candidate key
Unique key can be NULL ; multiple rows can have NULL values and t...
How to know what the 'errno' means?
...) , I get an errno=2 . What does it mean? How can I know the meaning of this errno ?
15 Answers
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