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What is the difference between is_a and instanceof?
... must accept an Object as the first argument, but PHP versions >= 5.3.9 now accept an optional third boolean argument $allow_string (defaults to false) to allow comparisons of string class names instead:
class MyBaseClass {}
class MyExtendingClass extends MyBaseClass {}
// Original behavior, ev...
Postgresql - change the size of a varchar column to lower length
...ne tries to update anything on that row it's going to reject it as too big now, at the point it goes to store the new version of the row. Hilarity ensues for the user.
VARCHAR is a terrible type that exists in PostgreSQL only to comply with its associated terrible part of the SQL standard. If you...
What does the Visual Studio “Any CPU” target mean?
...r to say how one can determine if a given DLL is 32-bit only. As far as I know, this should figure that out. I think we're hoping for DLLs which are also "Any CPU", rather than just x86 only.
– Dan W
Jul 10 '13 at 11:01
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git: abort commit in the middle of typing message
...m in the middle of committing. I have typed up my commit message in vim. I now remembered I needed to change something. I realize that there are other options to accomplish what I want, but I want to know if there is a way to abort the commit but still save the commit message I've typed up so far.
...
CSS transition shorthand with multiple properties?
...ay property.
Edit: previously listed here were the compatibilities and known issues regarding transition. Removed for readability.
Bottom-line: just use it. The nature of this property is non-breaking for all applications and compatibility is now well above 94% globally.
If you still want to be...
Force IE compatibility mode off using tags
...sion), it's safe to use this; otherwise, you may want to stick to IE=9 for now.
– calvinf
Aug 7 '12 at 1:00
75
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Is there a HTML opposite to ?
...ag in HTML that will only display its content if JavaScript is enabled? I know <noscript> works the opposite way around, displaying its HTML content when JavaScript is turned off. But I would like to only display a form on a site if JavaScript is available, telling them why they can't use th...
Regular expression to allow spaces between words
...tl;dr
Just add a space in your character class.
^[a-zA-Z0-9_ ]*$
Now, if you want to be strict...
The above isn't exactly correct. Due to the fact that * means zero or more, it would match all of the following cases that one would not usually mean to match:
An empty string, "".
A string...
What is pseudopolynomial time? How does it differ from polynomial time?
...then it will take some worst-case amount of time, say T, to complete. If I now add a single bit to the end of the number, like this:
100010101010111
The runtime will now (in the worst case) be 2T. I can double the amount of work the algorithm does just by adding one more bit!
An algorithm run...
What is the difference between
... i have met somewhere in code this variant else <%== %> does anyone know what is it?
– okliv
Jul 11 '12 at 17:03
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