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What's better at freeing memory with PHP: unset() or $var = null
...ry be freed when the parent object is garbage-collected.) (bug 33595)
The question "difference between unset and = null" details some differences:
unset($a) also removes $a from the symbol table; for example:
$a = str_repeat('hello world ', 100);
unset($a);
var_dump($a);
Outputs:
Notice: Undef...
Immutability of Strings in Java
...ove code does if you change s1 = s1.replace('i', '!'); to s1 = s1.replace('Q', '!'); :)
1 Actually, it is possible to mutate strings (and other immutable objects). It requires reflection and is very, very dangerous and should never ever be used unless you're actually interested in destroying the pr...
What is the difference between memoization and dynamic programming?
...amic programming?
Memoization is a term describing an optimization technique where you cache previously computed results, and return the cached result when the same computation is needed again.
Dynamic programming is a technique for solving problems of recursive nature, iteratively and is appli...
Java: Get last element after split
...or example "-" or "---", bits.length will be 0 and this will throw an ArrayIndexOutOfBoundsException. Example: https://onlinegdb.com/r1M-TJkZ8
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How to make connection to Postgres via Node.js
...e, so I installed postgres and started a server with initdb /usr/local/pgsql/data , then I started that instance with postgres -D /usr/local/pgsql/data now how can I interact with this through node? For example, what would the connectionstring be, or how am I able to find out what it is.
...
How to enumerate a range of numbers starting at 1
... Note that this doesn't skip the first item in the list, it offsets the index by the start value, so you would get an array out of bounds if you did something like: sequence[i] in your code.
– phyatt
Dec 5 '17 at 21:14
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Most used parts of Boost [closed]
...er containers and auto_ptr. I now mostly agree to this: bureau14.fr/blogea/index.php/2009/08/…
– amit
Jun 24 '10 at 7:58
1
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How to call Android contacts list?
...NTENT_URI);
Call startActivityForResult, passing in this Intent (and a request code integer, PICK_CONTACT in this example). This will cause Android to launch an Activity that's registered to support ACTION_PICK on the People.CONTENT_URI, then return to this Activity when the selection is made (or ...
overlay opaque div over youtube iframe
...in an iFrame, the default wmode is windowed which essentially gives it a z-index greater then everything else and it will overlay over anything.
Try appending this GET parameter to your URL:
wmode=opaque
like so:
https://www.youtube.com/embed/kRvL6K8SEgY?wmode=opaque
Make sure its the first pa...
How to permanently add a private key with ssh-add on Ubuntu? [closed]
...o simply:
nano ~/.ssh/config
...and enter the lines above as per your requirements.
For this to work the file needs to have chmod 600. You can use the command chmod 600 ~/.ssh/config.
If you want all users on the computer to use the key put these lines into /etc/ssh/ssh_config and the key in a ...