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What does the PHP error message “Notice: Use of undefined constant” mean?

...l_escape_string($_POST['message']); As is, it was looking for constants called department, name, email, message, etc. When it doesn't find such a constant, PHP (bizarrely) interprets it as a string ('department', etc). Obviously, this can easily break if you do defined such a constant later (tho...
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Removing transforms in SVG files

...ditor Find "transform" attributes in layers and delete them How to move all objects altogether without creating another transform attributes Go to Edit -> Select All in All Layers Go to Object -> Transform In Transform panel Uncheck Relative move and check Apply to each object separately...
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What is the pythonic way to avoid default parameters that are empty lists?

...he preferred way in this example is to say: if working_list is None . The caller might have used an empty list-like object with a custom append. – tzot Dec 14 '08 at 12:45 5 ...
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Simplest two-way encryption using PHP

What is the simplest way of doing two way encryption in common PHP installs? 6 Answers ...
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Difference between dispatch_async and dispatch_sync on serial queue?

... I do mean serial execution. In point of view that all tasks are executed serial regards to other tasks in the same queue. Of cause it still can be concurrent regards to other queues. It is the whole point of GCD that tasks can be dispatched and executed concurrently. ...
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Ways to implement data versioning in MongoDB

... approach would be to store diffs. Because the display of these diffs is really a special action, I would put the diffs in a different "history" collection. I would use the different collection to save memory space. You generally don't want a full history for a simple query. So by keeping the histo...
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Combining node.js and Python

... We are highly concerned about speed, what is the most elegant way how to call a Python "worker" from node.js in an asynchronous non-blocking way? ...
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How do I PHP-unserialize a jQuery-serialized form?

.... You do indeed need to parse the string that serialize returns. See the really popular answer below. – Isaac Lubow Mar 1 '19 at 2:17 add a comment  |  ...
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Can a C# lambda expression have more than one statement?

... (I'm assuming you're really talking about multiple statements rather than multiple lines.) You can use multiple statements in a lambda expression using braces, but only the syntax which doesn't use braces can be converted into an expression tree: ...
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Clear icon inside input text

.... jQ will add the class x (if input has value) showing the clear icon. Now all we need is to target with jQ the inputs with class x and detect on mousemove if the mouse is inside that 18px "x" area; if inside, add the class onX. Clicking the onX class removes all classes, resets the input value and ...