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A non well formed numeric value encountered

I have a form that passes two dates (start and finish) to a PHP script that will add those to a DB. I am having problems validating this. I keep getting the following errors ...
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How do you calculate the average of a set of circular data? [closed]

I want to calculate the average of a set of circular data. For example, I might have several samples from the reading of a compass. The problem of course is how to deal with the wraparound. The same algorithm might be useful for a clockface. ...
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What are the basic rules and idioms for operator overloading?

Note: The answers were given in a specific order , but since many users sort answers according to votes, rather than the time they were given, here's an index of the answers in the order in which they make most sense: ...
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When is std::weak_ptr useful?

I started studying smart pointers of C++11 and I don't see any useful use of std::weak_ptr . Can someone tell me when std::weak_ptr is useful/necessary? ...
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How to delete an item in a list if it exists?

I am getting new_tag from a form text field with self.response.get("new_tag") and selected_tags from checkbox fields with ...
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JMS Topic vs Queues

I was wondering what is the difference between a JMS Queue and JMS Topic. 9 Answers 9 ...
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AngularJS : When to use service instead of factory

However I still can't figure out when you'd use service over factory. 9 Answers 9 ...
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CAP theorem - Availability and Partition Tolerance

While I try to understand the "Availability" (A) and "Partition tolerance" (P) in CAP, I found it difficult to understand the explanations from various articles. ...
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Deep copy of a dict in python

I would like to make a deep copy of a dict in python. Unfortunately the .deepcopy() method doesn't exist for the dict . How do I do that? ...
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Is it ever advantageous to use 'goto' in a language that supports loops and functions? If so, why?

I've long been under the impression that goto should never be used if possible. While perusing libavcodec (which is written in C) the other day, I noticed multiple uses of it. Is it ever advantageous to use goto in a language that supports loops and functions? If so, why? ...