multidimensional-array

问题 I'm building a stream of data based on users a user is following. While I have a working prototype, the code seems unnecessarily ugly with multiple loops with further queries nested in them. I was wondering if I could get any advice on simplifying this, possible handling more within the sql query itself? On with some code: (I've trimmed this down a little and removed some of the rows retrieved). $init = $conn->prepare("SELECT followerid FROM following WHERE userid=?"); $init->bind_param("s",

问题 Is there a way to join two arrays based upon a same value in a key? As an example in MySQL you can left join two tables when two fields have the same value in it. The first array called 'phoneArr' is one with a person_id and a phone number The second array called 'clientDate' is one with a person_id and a appointment date. Here are the arrays: $phoneArr = array(); $phoneArr[0]['person_id'] = "123456"; $phoneArr[0]['phone'] = "555-2222"; $phoneArr[1]['person_id'] = "7654321"; $phoneArr[1][

问题 I am trying to take the positions of the cells of a game level and map them to a 2D array. I want to do this so I can make each ground cell (and NOT background cell) collidable with my player character. Below is the current code that someone created for me: int tileSize = 20; int screenSizeInTiles = 30; // initializing multidimensional array of points var tilePositions = new System.Drawing.Point[screenSizeInTiles, screenSizeInTiles]; for (int x = 0; x < screenSizeInTiles; x++) { for (int y =

问题 The following creates a multidimensional array, where a date and id are pair objects: if( $queryPosts->have_posts() ): $dateOrdered = []; while ( $queryPosts->have_posts() ) : $queryPosts->the_post(); $id = $post->ID; $date = usp_get_meta(false, 'usp-custom-80'); array_push($postOrdered, $id); $dateOrdered[] = array("date"=>$date, "id"=>$id); endwhile; endif; Then I need to run something like the following to sort by dates in order to then have a list of ordered by dates post ids too function

问题 Screenshot of my array like this; Array( [a] => val1 [b] => Array( [c]=>68 ) ) How can I get variable as; a=val1 c=68 with php using loop? 回答1: $array = array('a' => 'val1', 'b' => array('c' => 68)); echo $array['a']; //val1 echo $array['b']['c']; //68 To just output all values of a multidimensional array: function outputValue($array){ foreach($array as $key => $value){ if(is_array($value)){ outputValue($value); continue; } echo "$key=$value" . PHP_EOL; } } The same can be accomplished using

问题 I'm trying to insert a PHP array into a mysql database, but am having trouble with this particular array. I'm trying to create a function that takes array( 0 => array ( 'col1' => 'value', 'col2' => 'value', 'col3' => 'value', 'col4' => value', 'col5' => 'value', 'col6' => array ( 'string' => array ( 'col7' => 'value' , 'col8' => 'value'), ), ), 1 => array ( 'col1' => 'value', 'col2' => 'value', 'col3' => 'value', 'col4' => array ( ), 'col5' => 'value', 'col6' => array ( 'string' => array ( ),

问题 I am using d3JS v5 (can include lodash as well). I have data which comes as a variable: var groupeddata = [{Title: "Dummy Data", ID: "46", RFU:20291, barcolor: "#ff7f00"}, {Title: "Dummy Data", ID: "50", RFU:63, barcolor: "#ff7f00"}, {Title: "Dummy Data", ID: "56", RFU:6, barcolor: "#ff7f00"}, {Title: "Dummy Data2", ID: "46", RFU:21, barcolor: "#ff7f00"}, {Title: "Dummy Data2", ID: "50", RFU:18095, barcolor: "#ff7f00"}, {Title: "Dummy Data2", ID: "56", RFU:27278, barcolor: "#ff7f00"}];

问题 I'm wondering is there a way to get the following code to work, or do I have to create a new copy of the function for fixed sizes? If so how can I have a generic function for fixed sizes. void prettyPrintMatrix_float(float **matrix, int rows, int cols){ int i, j; for (i = 0; i<rows; i++){ for (j = 0; j<cols; j++){ printf("%10.3f", matrix[i][j]); } printf("\n"); } return; } float ppArray[4][10] = {0.0f}; prettyPrintMatrix_float(ppArray, 4, 10); Gives an error Access violation reading location

问题 I'm keeping track of the unique combinations encountered of three different integer IDs using the solution described in Continuously insert all unique combinations encountered of three IDs. These IDs are a combination of product/group/region IDs etc. Now I want to bulk update another table by finding the unique IDs that correspond to those combinations. I'm trying to do that using the function update_with_combination_ids below, but it doesn't work because Postgres has limited support for

问题 So far I thought that the following syntax was invalid, int B[ydim][xdim]; But today I tried and it worked! I ran it many times to make sure it did not work by chance, even valgrind didn't report any segfault or memory leak !! I am very surprised. Is it a new feature introduced in g++? I always have used 1D arrays to store matrices by indexing them with correct strides as done with A in the program below. But this new method, as with B, is so simple and elegant that I have always wanted. Is