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php出现 Notice: Undefined index: xxx 的解决方法 - 更多技术 - 清泛网移...
php出现 Notice: Undefined index: xxx 的解决方法Php_Notice_Undefined_index出现 "Undefined index: xxx "警告的原因：PHP 本身不需要事先声明变量即可直接使用，但是对未声明变量会有提示，最好的办法是使用变量之前先检查变量是否存在。出现"...
php出现 Notice: Undefined index: xxx 的解决方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
php出现 Notice: Undefined index: xxx 的解决方法Php_Notice_Undefined_index出现 "Undefined index: xxx "警告的原因：PHP 本身不需要事先声明变量即可直接使用，但是对未声明变量会有提示，最好的办法是使用变量之前先检查变量是否存在。出现"...
【已解决】ERROR: Compile R Classes returned E=1 - 用户反馈 - 清泛IT社区，为创新赋能！
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根据用户描述，AI伴侣测试正常，编译则报错。
[hide]最终发现，是由于项目名全数字导致的问题（也许是数字开头导致的），可能是用户改了文件名再导入导致的问题。
正常情况下，新建项目/项目改名都是能够拦截全数...
Remove redundant paths from $PATH variable
I have defined the same path in the $PATH variable 6 times.
11 Answers
11
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How to check if remote branch exists on a given remote repository?
I need to do a subtree merge for a specific branch, if it exists on a given remote repository. The problem is that the remote repository is not checked out locally, so I can't use git branch -r . All I have is a remote address, something like this https://github.com/project-name/project-name.git ...
Why doesn't Java offer operator overloading?
Coming from C++ to Java, the obvious unanswered question is why didn't Java include operator overloading?
16 Answers
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Remove Item from ArrayList
I have an ArrayList suppose list , and it has 8 items A-H and now I want to delete 1,3,5 position Item stored in int array from the list how can I do this.
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Preferred Java way to ping an HTTP URL for availability
I need a monitor class that regularly checks whether a given HTTP URL is available. I can take care of the "regularly" part using the Spring TaskExecutor abstraction, so that's not the topic here. The question is: What is the preferred way to ping a URL in java?
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How to Batch Rename Files in a macOS Terminal?
I have a folder with a series of files named:
7 Answers
7
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URLWithString: returns nil
it may be very easy, but I don't seems to find out why is URLWithString: returning nil here.
7 Answers
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