associative-array | 易学教程

How to loop through an JSON associative array in javascript?

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问题 I'm getting a JSON response from the server and i have to loop through the array in javascript and get the values. But I cant seem to loop throught it. The JSON response of the array looks like this: { "1": "Schools", "20": "Profiles", "31": "Statistics", "44": "Messages", "50": "Contacts" } I just want to loop through it to get the ID and Name and populate some values on the page. I have tried: $.each(response, function(key, value) { alert(key + ' ' + value); }); // and for (var key in

Associative Array versus SplObjectStorage

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问题 I'm working on code to manage a collection of unique objects. The first prototype of this code utilises an associative array, basically as that's the way I've always done it. However, I'm also keen on taking advantage of functionality that's been added to more modern versions of PHP such as SplObjectStorage for doing this instead, partly as a learning experience, partly because it's bound to offer advantages (benchmarks I've seen suggest that SplObjectStorage can be faster than arrays in a

How to loop over and access various elements in an array that is both multidimentional and associative? PHP, either JSON or XML

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I'm retrieving bibliographic data via an API (zotero.org), and it is similar to the sample at the bottom (just way more convoluted - sample is typed). I want to retrieve one or more records and display certain values on the page. For example, I would like to loop through each top level record and print the data in a nicely formated citation. Ignoring the proper bib styles for the moment, let's say I want to just print out the following for each record returned: author1 name, author2 name, article title, publication title, key This doesn't match the code, because I've clearly been referencing

PHP: While loop not working after adjusting SELECT for SQL injection prevention

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问题 I am trying to set up PHP queries for MySQL in a way to prevent SQL injection (standard website). I had a couple of INSERT queries where changing this worked well but on the following SELECT I keep getting an error since the update and it looks like the while loop doesn't work with the changes I made (it works well without using the statement as in the old code). Can someone tell me what I am doing wrong here ? New PHP: $stmt = $conn->prepare("SELECT ? FROM TranslationsMain WHERE location

Clojure macro that will conserve associative map order

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问题 To preface, I am on Windows 7 (64-bit), running Java version 6 (update 33) using clooj as my IDE. I have not tried to reproduce my problem in any other system. I am experienced with Clojure, but not at all with Java. The entirety of the problem I am trying to solve is lengthy to describe, but it boils down to this: let's say I would like to a make a macro that takes one argument, an associative map, and returns a vector of the elements of the map with their order conserved. =>(defmacro

Search of Dictionary Keys python

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I want to know how I could perform some kind of index on keys from a python dictionary. The dictionary holds approx. 400,000 items, so I am trying to avoid a linear search. Basically, I am trying to find if the userinput is inside any of the dict keys. for keys in dict: if userinput in keys: DoSomething() break That would be an example of what I am trying to do. Is there a way to search in a more direct way, without a loop ? or what would be a more efficient way. Clarification: The userinput is not exactly what the key will be, eg userinput could be log , whereas the key is logfile Edit: any

PHP Count function with Associative Array

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Could someone please explain to me how the count function works with arrays like the one below? My thought would be the following code to output 4, cause there are 4 elements there: $a = array ( "1" => "A", 1=> "B", "C", 2 =>"D" ); echo count($a); count works exactly as you would expect, e.g. it counts all the elements in an array (or object) . But your assumption about the array containing four elements is wrong: "1" is equal to 1, so 1 => "B" will overwrite "1" => "A" . because you defined 1, the next numeric index will be 2, e.g. "C" is 2 => "C" when you assigned 2 => "D" you overwrote "C".

JS associative arrays: add new pair

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I have an associative array in JS. var array = { 'one' : 'first', 'two' : 'second', 'three' : 'third' }; How can I add new pair in it array['newpair'] = 'new value'; or array.newpair = 'newvalue'; This is quite a decent read on the subject . It's an object literal, not really an "associative array". Just do array['something'] = 'something'; 来源： https://stackoverflow.com/questions/6936636/js-associative-arrays-add-new-pair

create multidimensional associative array from CSV in PHP

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I'm trying to create a multidimensional array in PHP where the inner arrays are associative for the following example CSV string $csv: # Results from 2015-06-16 to 2015-06-16. date,time,label,artist,composer,album,title,duration 2015-06-16,12:00 AM,Island,U2,"Clayton- Adam,The Edge,Bono,Mullen- Larry- Jr",Songs Of Innocence,SONG FOR SOMEONE,03:46 2015-06-16,12:04 AM,Lowden Proud,"Fearing & White, Andy White, Stephen Fearing","White- Andy,Fearing- Stephen",Tea And Confidences,SECRET OF A LONG LASTING LOVE,03:10 2015-06-16,12:07 AM,Columbia,The Wallflowers,"Dylan- Jakob,Irons- Jack,Mathis-

array_reduce() can't work as associative-array “reducer” for PHP?

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问题 I have an associative array $assoc , and need to reduce to it to a string, in this context $OUT = "<row"; foreach($assoc as $k=>$v) $OUT.= " $k=\"$v\""; $OUT.= '/>'; How to do in an elegant way the same thing, but using array_reduce() Near the same algorithm (lower performance and lower legibility) with array_walk() function, array_walk( $row, function(&$v,$k){$v=" $k=\"$v\"";} ); $OUT.= "\n\t<row". join('',array_values($row)) ."/>"; Ugly solution with array_map() (and again join() as reducer