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How to perform Callbacks in Objective-C
...ss" and MyClass calls the delegate methods on the delegate as appropriate. If your delegate callbacks are optional, you'll typically guard them at the dispatch site with something like "if ([delegate respondsToSelector:@selector(myClassWillDoSomething:)) {". In my example, the delegate is required t...
How are echo and print different in PHP? [duplicate]
Is there any major and fundamental difference between these two functions in PHP?
5 Answers
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HTML anchor link - href and onclick both?
...n is processed or not - returning false means that it isn't processed, but if you return true then the browser will proceed to process it after your function returns and go to the proper anchor.
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MongoDB/NoSQL: Keeping Document Change History
...equirement in database applications is to track changes to one or more specific entities in a database. I've heard this called row versioning, a log table or a history table (I'm sure there are other names for it). There are a number of ways to approach it in an RDBMS--you can write all changes fr...
How to remove part of a string? [closed]
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If you're specifically targetting "11223344", then use str_replace:
// str_replace($search, $replace, $subject)
echo str_replace("11223344", "","REGISTER 11223344 here");
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What is the easiest way in C# to trim a newline off of a string?
...ment.NewLine.Length);
}
return text;
}
It's somewhat inefficient if there are multiple newlines, but it'll work.
Alternatively, if you don't mind it trimming (say) "\r\r\r\r" or "\n\n\n\n" rather than just "\r\n\r\n\r\n":
// No need to create a new array each time
private static readonly...
MongoDB, remove object from array
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@NicolasDelValle if I remember correctly, these were options upsert and multi. For current syntax & documentation check this link: docs.mongodb.com/manual/reference/method/db.collection.update
– Lukas Liesis
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Twitter image encoding challenge [closed]
...which I'm currently doing manually in Inkscape).
Version 2
UPDATE: v2 is now qualified to compete. Changes:
Command-line control input/output and debugging
Uses XML parser (lxml) to handle SVG instead of regex
Packs 2 path segments per unicode symbol
Documentation and cleanup
Support style="fill...
How to easily resize/optimize an image size with iOS?
...the iPhone is PNG, because it has optimizations for that format. However, if you want to store these images as JPEGs, you can take your UIImage and do the following:
NSData *dataForJPEGFile = UIImageJPEGRepresentation(theImage, 0.6);
This creates an NSData instance containing the raw bytes for a...