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优惠券批量生成及导入的思路 - 闲聊区 - 清泛IT论坛，有思想、有深度
...;$n = mt_rand(0, PHP_INT_MAX);
$m = base_convert($m, 10, 36); // 主随机
$n = base_convert($n, 10, 36); // 辅随机
$r = substr($m . $n, 0, 16);
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How to implement a property in an interface
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I would vote for the first sentence. But abstract base classes should always be avoided if an interface is enough. So before you know what problem should actually be solve, you shouldn't suggest to create a base class.
– Stefan Steinegger
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Remove a JSON attribute [duplicate]
...ects or other values, since they don't have a "key". Arrays use a position based index, which is why you would always access values in an array using integer based indices.
– praneetloke
Apr 1 '18 at 17:16
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What's the difference between Unicode and UTF-8? [duplicate]
...lem.)
If it makes you feel any better about it, ‘ANSI’ strings aren't based on any ANSI standard, either.
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Sorting HashMap by values [duplicate]
... while loops. Converting the Entry Set to a List and then sorting the List based on a comparator would be a more efficient solution.
– picmate 涅
May 21 '16 at 2:53
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Why are margin/padding percentages in CSS always calculated against width?
...-right/margin-bottom/margin-left, all four have to be relative to the same base. If top/bottom used a different base than left/right', then "n%" margin (and padding) wouldn't mean the same thing on all four sides.
(Also note having the top/bottom margin relative to the width enables a weird CSS ha...
Renaming branches remotely in Git
...;/<old_name>:refs/heads/<new_name> to push a new remote branch based on the old remote tracking branch and then git push <remote> :<old_name> to delete the old remote branch.
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How to do version numbers? [closed]
...ces or a migration to another platform that involves dramatic changes over base code,
– Alexis Gamarra
Jun 9 '17 at 16:22
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Random row selection in Pandas dataframe
...e: As of Pandas v0.20.0, ix has been deprecated in favour of loc for label based indexing.
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How to find difference between two Joda-Time DateTimes in minutes
...d will need to compute the amount of time between now and some future time based on a date from another time zone. I will report back what I find.
– Doo Dah
Apr 21 '16 at 1:29
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