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C++虚继承的概念 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的同名的数据成员在内存中有不同的拷贝造成数据不一致问题，将共同基类设置为虚基类。这时从...C++中虚拟继承的概念
为了解决从不同途径继承来的同名的数据成员在内存中有不同的拷贝造成数据不一致问题，将共同基类设...
Check whether an array is empty [duplicate]
... You don't need to count the elements or use empty(). A one-liner like php -r 'echo array() ? "T":"F";' will show the truthiness for an empty or non-empty array.
– jerseyboy
May 16 '14 at 13:08
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Remove empty array elements
...ments that are i.e. exact string '0', you will need a custom callback:
// PHP 7.4 and later
print_r(array_filter($linksArray, fn($value) => !is_null($value) && $value !== ''));
// PHP 5.3 and later
print_r(array_filter($linksArray, function($value) { return !is_null($value) && $...
How to let PHP to create subdomain automatically for each user?
...ess htaccess somehow? Is it actually simply possible to create it via pure php code or I need to use some external script-server side language?
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What is the difference between client-side and server-side programming?
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Mechanisms for tracking DB schema changes [closed]
... found.
For all .sql files numbered higher than VERSION, execute them in order
If one of the files produced an error: roll back to the backup
Otherwise, update the version in the bookkeeping table to the highest .sql file executed.
Everything goes into source control, and every installati...
Redis 的性能幻想与残酷现实 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...态数据
临时缓存数据
后台统计用的流水数据
导致的问题就是当你想扩分片的时候，客户端 Hash 映射就变了，这是要迁移数据的。而所有数据放在一组 Redis 里，要把它们分开就麻烦了，每个 Redis 实例里面都是千万级的 key。
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PHP function to get the subdomain of a URL
Is there a function in PHP to get the name of the subdomain?
28 Answers
28
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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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Git command to show which specific files are ignored by .gitignore
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As mentioned in the ls-files man page, --others is the important part, in order to show you non-cached, non-committed, normally-ignored files.
--exclude_standard is not just a shortcut, but a way to include all standard "ignored patterns" settings.
exclude-standard
Add the standard git excl...