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Calculate difference between two datetimes in MySQL
...MySQL function. For example, you can use:
SELECT TIMESTAMPDIFF(SECOND, '2012-06-06 13:13:55', '2012-06-06 15:20:18')
In your case, the third parameter of TIMSTAMPDIFF function would be the current login time (NOW()). Second parameter would be the last login time, which is already in the database....
[ :Unexpected operator in shell programming [duplicate]
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answered Aug 5 '10 at 1:08
WolphWolph
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B-Tree vs Hash Table
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117
You can only access elements by their primary key in a hashtable.
This is faster than with a t...
How to get a URL parameter in Express?
...issue on getting the value of tagid from my URL: localhost:8888/p?tagid=1234 .
4 Answers
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PHP code to remove everything but numbers
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281
Try this:
preg_replace('/[^0-9]/', '', '604-619-5135');
preg_replace uses PCREs which general...
How does clipsToBounds work?
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If my superview is a box measuring 10 units on each side, and my subview is 20 units wide, with clipsToBounds set to YES, I'll only see the part of the subview that fits within the bounds of the superview. Otherwise, if clipsToBounds is set to NO, I'll see th...
Cannot pass null argument when using type hinting
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PHP 7.1 or newer (released 2nd December 2016)
You can explicitly declare a variable to be null with this syntax
function foo(?Type $t) {
}
this will result in
$this->foo(new Type()); // ok
$this->foo(null); // ok
$this-&...
Adjusting the Xcode iPhone simulator scale and size [duplicate]
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210
You can't have 1:1 ratio.
However you can scale it from the iOS Simulator > Window > Scal...
How to add to an existing hash in Ruby
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191
If you have a hash, you can add items to it by referencing them by key:
hash = { }
hash[:a] =...