unset

问题 how to unset readonly variable in Bash? $ readonly PI=3.14 $ unset PI bash: PI: readonly variable or is it not possible? 回答1: Actually, you can unset a readonly variable . but I must warn that this is a hacky method. Adding this answer, only as information, not as a recommendation. Use it at your own risk. Tested on ubuntu 13.04, bash 4.2.45. This method involves knowing a bit of bash source code & it's inherited from this answer. $ readonly PI=3.14 $ unset PI -bash: unset: PI: cannot unset:

问题 I have the following function and it's objective is to filter in the array tree those elements what are not conform to the search index and eliminate theme. I can get this function to bring the desired results. public function negativeKeywordsFilter($products, $negative_keywords){ $nk=explode(',',$negative_keywords); foreach ($products['productItems'] as $product){ foreach ($product as $item){ foreach ($nk as $word){ if (stripos($item['name'],$word) !== false){ unset($item); } } } } return

问题 I hope you can help me on this one: I want to delete an xml node via unset. I have two variants of how this could be done, but only one is working. Please tell me whats the difference or why only the second variant is working. So when using the first variant the print_r() function gives back the whole xml file with the image 'Hansio' that should have been deleted. But when using the second variant the image is deleted! (You can actually copy the whole php code into a file as well as the xml

问题 I've written a very simple 'deploy' script running as my post-update hook inside my bare git repo. The variables are as follows live domain = ~/mydomain.com staging domain = ~/stage.mydomain.com git repo location = ~/git.mydomain.com/thisrepo.git (bare) core = ~/git.mydomain.com/thisrepo.git core == added remote into each live & stage gits both live & stage have initialized git repos (non-bare) and I have added my bare repo as a remote to each of them (named core ) so that git pull core stage

问题 I have a kind of store where members of a ski club can rent equipment. The first step is a loop where the member can make repetitive choices, for example for him and his family. Each line of material has its own total with a grand total at the bottom. A problem occurs once the last renting has been done and the member want to finalize his payment. The line of the last rented equipment is doubled and as a result the grand total is false. An idea how to solve this. I think it has something to

问题 I'm currently working on a generic form creation class and had an issue yesterday. I made a snippet to reproduce the problem. Essentially I want to delete elements that are grouped from the original elements array after the whole group has been drawn and I'm doing this while looping over the elements array. The code snippet should cover the problem, am I missing something here? From my knowledge deleting an element while foreach is completely safe and legal since foreach internally only uses

问题 So I need to delete some array elements, is there easy way not including foreach loop? $privateData = ['id', 'date', 'whatever']; foreach($privateData as $privateField) { unset($request[$privateField]); } I tried to search array_map array_walk functions for examples but I did not find any. 回答1: $result = array_diff_key($request, array_flip(['id', 'date', 'whatever'])); 回答2: Here's how you do it using array_map : array_map(function($privateField) use ($request) { unset($request[$privateField])

问题 I'm using a session variable to store login data. Locally, everything works smooth, it logs in nicely and doesn't log out inbetween pages. But when I put the same files on the server, for some reason I get logged out. I've already found this post, and tried using following code to prevent caching of dynamic pages: header("Cache-Control: no-cache, must-revalidate"); header("Expires: Sat, 26 Jul 1997 05:00:00 GMT"); // Date in the past Though that doesn't seem to work. Are there any other

问题 I want to use the same variable name with a different datatype in C program without casting. I really wanna do that don't ask why. So how can I do that ? And how can I handle the error if this variable doesn't exist while doing prophylactic unsetting ? 回答1: You can't. The closest you can get is creating separate scopes and using the same variable name in them: { int val; // do something with 'val' } { double val; // do something with 'val' } 回答2: If you want the same memory to be referenced

问题 I can access anywhere inside the multi-dimensional an array via reference method. And I can change the its value. For example: $conf = array( 'type' => 'mysql', 'conf' => array( 'name' => 'mydatabase', 'user' => 'root', 'pass' => '12345', 'host' => array( '127.0.0.1', '88.67.45.123', '129.34.123.55' ), 'port' => '3306' ) ); $value = & $this->getFromArray('type.conf.host'); $value = '-- changed ---'; // result $conf = array( 'type' => 'mysql', 'conf' => array( 'name' => 'mydatabase', 'user' =>