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How to perform Callbacks in Objective-C
...ts delegate, then there would be a retain cycle. It's a good idea in the dealloc method of a class that that has a MyClass instance and is its delegate to clear that delegate reference since it's a weak back pointer. Otherwise if something is keeping the MyClass instance alive, you'll have a danglin...
Codeigniter - no input file specified
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Just add the ? sign after index.php in the .htaccess file :
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ index.php?/$1 [L]
and it would work !
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How do I trim whitespace?
...er will merge the words and you'll no longer be able to use .split(" ") to tokenize.
– user3467349
Feb 13 '15 at 19:20
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Reference: What is variable scope, which variables are accessible from where and what are “undefined
What is "variable scope" in PHP? Are variables from one .php file accessible in another? Why do I sometimes get "undefined variable" errors?
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How can I get all the request headers in Django?
...ch any characters in the string you give it, so if you have a header "HTTP_TOKEN_ID" it will give back "OKEN_ID", because the "T" at the beginning of "TOKEN" matches a character in the string passed to lstrip. The way to do it is prefix = 'HTTP_'; header = header[len(prefix):].
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Compare floats in php
I want to compare two floats in PHP, like in this sample code:
16 Answers
16
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How to get the first non-null value in Java?
... the efficiency reasons that i mentioned above is that an array allocation will happen each time you invoke the var arg version of the method. this could be wasteful for hand-fulls of items, which i suspect will be common usage.
– les2
May 4 '10 at 1...
Sending emails in Node.js? [closed]
... with NPM:
npm install alphamail
Sign up for a AlphaMail account. Get a token, and then you can start sending with the AlphaMail service.
var alphamail = require('alphamail');
var emailService = new alphamail.EmailService()
.setServiceUrl('http://api.amail.io/v1/')
.setApiToken('YOUR-AC...
Regular Expressions and negating a whole character group [duplicate]
...ut simplicity.
The other technique, described here as a tempered greedy token, is suitable for more complex problems, like matching delimited text where the delimiters consist of multiple characters (like HTML, as Luke commented below). For the problem described in the question, it's overkill.
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Creating default object from empty value in PHP?
I see this error only after upgrading my PHP environment to PHP 5.4 and beyond. The error points to this line of code:
16 A...