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PostgreSQL: Difference between text and varchar (character varying)
...ength array).
Check this article from Depesz: http://www.depesz.com/index.php/2010/03/02/charx-vs-varcharx-vs-varchar-vs-text/
A couple of highlights:
To sum it all up:
char(n) – takes too much space when dealing with values shorter than n (pads them to n), and can lead to subtle err...
Which one will execute faster, if (flag==0) or if (0==flag)?
... does warn in case of the former (flag = 0), there are no such warnings in PHP, Perl or Javascript or <insert language here>.
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What does `node --harmony` do?
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It enables harmony modules in node js:
http://wiki.ecmascript.org/doku.php?id=harmony:modules
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What data type to use for hashed password field and what length?
...a key-strengthening hash algorithm like Bcrypt or Argon2i. For example, in PHP, use the password_hash() function, which uses Bcrypt by default.
$hash = password_hash("rasmuslerdorf", PASSWORD_DEFAULT);
The result is a 60-character string similar to the following (but the digits will vary, because...
Error :Request header field Content-Type is not allowed by Access-Control-Allow-Headers
... extra header. Try prepending the following to your file if you are using PHP:
header("Access-Control-Allow-Origin: *");
header("Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept");
Make sure that you haven't already used header in another file, or you will get a nasty...
Laravel Eloquent Sum of relation's column
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Not the answer you're looking for? Browse other questions tagged php laravel eloquent relation or ask your own question.
How do write IF ELSE statement in a MySQL query
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you must write it in SQL not it C/PHP style
IF( action = 2 AND state = 0, 1, 0 ) AS state
for use in query
IF ( action = 2 AND state = 0 ) THEN SET state = 1
for use in stored procedures or functions
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Is there a command for formatting HTML in the Atom editor?
...eautify - Package for Atom, you can format code for HTML, CSS, JavaScript, PHP, Python, Ruby, Java, C, C++, C#, Objective-C, CoffeeScript, TypeScript, Coldfusion, SQL, and more) in Atom within a matter of seconds.
To Install the atom-beautify package :
Open Atom Editor.
Press Ctrl+Shift+P (Cmd+Shif...
What does (function($) {})(jQuery); mean?
...ny other (a, $b, a$b etc.) and it doesn't have any
special meaning like in PHP.
Knowing that we can take another look at our example:
var $f = function($) { return $*$; };
var jQuery = 2;
console.log( $f(jQuery) ); // Gives: 4
// An inline version (immediately invoked)
console.log( (function($) ...
Properly escape a double quote in CSV
...characters was never backed up and the original question doesn't ask about PHP. This only seems to be true for the string delimiter (and only for the chosen delimiter) when a program, such as Open Office, allows you to change it.
– Dave F
Dec 1 '18 at 22:07
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