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PHP: Check if variable exist but also if has a value equal to something

I have (or not) a variable $_GET['myvar'] coming from my query string and I want to check if this variable exists ... -if-variable-exist-but-also-if-has-a-value-equal-to-something...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - React Hooks - What's happening under the hood?

I've been trying out React Hooks and they do seem to simplify things like storing state. However, they seem ... .com/questions/53729917/react-hooks-whats-happening-under-the-hood...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - What does _ngcontent-c# mean in Angular?

I'm learning Angular 2/4 and I see the html tags with the ng generated attributes: _ngcontent-c0, _ngcontent ... .com/questions/45082129/what-does-ngcontent-c-mean-in-angular...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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mysql - What does double bars (||) mean in SQL?

(This question already has answers here): question from:https://stackoverflow.com/questions/23919378/what-does-double-bars-mean-in-sql...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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neo4j: How do I change the database storage location?

Hi I created a neo4j database with custom java application and tried to change path in configuration file in order ... /10888280/neo4j-how-do-i-change-the-database-storage-location...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - React Hooks - What's happening under the hood?

I've been trying out React Hooks and they do seem to simplify things like storing state. However, they seem ... .com/questions/53729917/react-hooks-whats-happening-under-the-hood...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - How to read from stdin with fgets()?

I've written the following code to read a line from a terminal window, the problem is the code gets stuck ... stackoverflow.com/questions/3919009/how-to-read-from-stdin-with-fgets...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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testing - Moq - Is it possible to specify in a Setup the Verify criteria (e.g. Times called)?

If you need to Setup a return value, as well as Verify how many times the expression was called, can you do this in ... -to-specify-in-a-setup-the-verify-criteria-e-g-times-calle...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - Strange generic function appear in view controller after converting to swift 3

In my project, after converting to swift 3, a new function appeared before my ViewController class: fileprivate ... function-appear-in-view-controller-after-converting-to-swift-3...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ubuntu - /bin/sh: 1: apk: not found while creating docker image

I have the below Dockerfile for zookeeper and I am trying to create an image for it, but it is giving me ... questions/40445243/bin-sh-1-apk-not-found-while-creating-docker-image...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Any way to reserve but not commit memory in linux?

Windows has VirtualAlloc, which allows you to reserve a contiguous region of address space, but not actually use any physical ... /any-way-to-reserve-but-not-commit-memory-in-linux...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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github - How to refer to a previous commit in git commit message

Is there a convention for referring to a previous commit in a git commit message? Example commit message: Fixed bug such ... how-to-refer-to-a-previous-commit-in-git-commit-message...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - Apply function to each row of pandas dataframe to create two new columns

I have a pandas DataFrame, st containing multiple columns: <class 'pandas.core.frame.DataFrame'> DatetimeIndex: 53732 ... -each-row-of-pandas-dataframe-to-create-two-new-columns...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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cocoa - Core Data -existingObjectWithID:error: causes error 133000

My app uses Core Data (with some help of Magical Record) and is rather heavily multithreaded using ... com/questions/8637444/core-data-existingobjectwithiderror-causes-error-133000...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Print out only headers in Rails request

I know how to access a header in Rails request.headers["HEADER_NAME"] However, I want to get all headers ... .com/questions/28735777/print-out-only-headers-in-rails-request...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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qt - How can I access my Window object properties from C++ while using QQmlApplicationEngine?

I've been trying to learn QtQuick for GUI creation, but I've been having a hard time understanding how to ... i-access-my-window-object-properties-from-c-while-using-qqmlapplicatio...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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android - Error while retrieving information from the server RPC:s-7:AEC-0 in Google play?

I made my test account to be synced in my device and ready to test the app. While I am about to purchase ... while-retrieving-information-from-the-server-rpcs-7aec-0-in-google-play...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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What's the difference between git reset --hard and git reset --merge

In my experiments I haven't been able to find any functional difference between git reset --hard and git reset - ... whats-the-difference-between-git-reset-hard-and-git-reset-merge...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How do I animate a background color to transparent in jQuery?

I can animate from transparent to color, but when I tell jquery to animate the backgroundColor: 'transparent' it just ... -do-i-animate-a-background-color-to-transparent-in-jquery...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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version control - Git, adding files to repository gives fatal error for LF ->CRLF

I'm new to git and I need some help. I'm using msysgit on windows. When I execute the command git add [ ... /8651708/git-adding-files-to-repository-gives-fatal-error-for-lf-crlf...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Where is == operator defined in Class "object"?

I searched the source code of FCL, and I got confused that string.Equals() uses Object.ReferenceEquals(), and ... .com/questions/34172634/where-is-operator-defined-in-class-object...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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map function - Prolog map procedure that applies predicate to list elements

How do you write a Prolog procedure map(List, PredName, Result) that applies the predicate PredName(Arg, ... 6682987/prolog-map-procedure-that-applies-predicate-to-list-elements...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Mixing Haskell and C++

If you had the possibility of having an application that would use both Haskell and C++. What layers would ... :https://stackoverflow.com/questions/3540932/mixing-haskell-and-c...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - sqlalchemy : executing raw sql with parameter bindings

I'm trying to run this simple raw sql statement with parameters with SQLALchemy (within an alembic ... /questions/23206562/sqlalchemy-executing-raw-sql-with-parameter-bindings...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Do all email providers ignore periods in front of @?

I know that gmail lets a user insert as many periods as he/she wants in an email address before the @ sign ... /questions/14865869/do-all-email-providers-ignore-periods-in-front-of...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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LINQ Include vs Join. Are they equivalent?

I have used join in linq to join 2 tables. What is the difference between a join and Include. From ... stackoverflow.com/questions/12284719/linq-include-vs-join-are-they-equivalent...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Cleanest way to get the next sibling in jQuery

http://jsfiddle.net/mplungjan/H9Raz/ After quite some tests with next('a') and such, I finally found one that ... /questions/6237673/cleanest-way-to-get-the-next-sibling-in-jquery...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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machine learning - Calling "fit" multiple times in Keras

I've working on a CNN over several hundred GBs of images. I've created a training function that bites ... /stackoverflow.com/questions/39263002/calling-fit-multiple-times-in-keras...

asked Oct 6, 2021 in Technique[技术] by 深蓝 (71.8m points)

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