This isn’t exactly intuitive, but you cannot Redim(VB6 Ref) an array if you dimmed it with dimensions. Exact quote from linked page is: The ReDim statement is used to size or resize a dynamic array that has already been formally declared using a Private, Public, or Dim statement with empty parentheses (without dimension subscripts). In … Read more
Just iterate over the array and use another array for the groups. It should be fast enough and is probably faster than the overhead involved when using sqlite or similar. $groups = array(); foreach ($data as $item) { $key = $item[‘key_to_group’]; if (!isset($groups[$key])) { $groups[$key] = array( ‘items’ => array($item), ‘count’ => 1, ); } … Read more
Two values from key => value pairs are considered equal only if (string) $elem1 === (string) $elem2 . In other words a strict check takes place so the string representations must be the same. http://php.net/manual/en/function.array-diff-assoc.php The (string) value of any array is “Array”. Thus, your call to array_diff_assoc is effectively comparing these two things: Array … Read more
Use function array_reduce() to combine the items having the same city: $input = array( array(‘city’ => ‘NewYork’, ‘cash’ => ‘1000’), array(‘city’ => ‘Philadelphia’, ‘cash’ => ‘2300’), array(‘city’ => ‘NewYork’, ‘cash’ => ‘2000’), ); $output = array_reduce( // Process the input list $input, // Add each $item from $input to $carry (partial results) function (array $carry, … Read more
Using uksort: uksort($array, function($a, $b) { return count($b) – count($a); }); Using array_multisort: array_multisort(array_map(‘count’, $array), SORT_DESC, $array); With PHP < 5.3: function sort_cb($a, $b) { return count($b) – count($a); } uksort($array, ‘sort_cb’);
It’s only worth trying to do this in-place if you are under significant space constraints. If that’s the case, it is possible to speed up your code a little bit by iterating over a flattened view of the array. Since reshape returns a new view when possible, the data itself isn’t copied (unless the original … Read more
Function arguments are passed by value in C and modifying arguments in callee won’t affect caller’s local variables. Use pointers to modify caller’s local variables. void CreateMap(MapTileData ***Map, int xSize, int ySize) { //Variables int i; //Allocate Initial Space *Map = calloc(xSize, sizeof(MapTileData)); for(i = 0; i < xSize; i++) { (*Map)[i] = calloc(ySize, sizeof(MapTileData)); … Read more
Can’t be done with a simple command, but you can use a loop: foreach(array_keys($output) as $key) { unset($output[$key][1]); }
foreach ( $array as $k=>$v ) { $array[$k] [‘id’] = $array[$k] [‘fee_id’]; unset($array[$k][‘fee_id’]); } This should work
PHP has no support for a SQL where sort of thing, especially not with an array of arrays. But you can do the counting your own while you iterate over the data: $count = array(); foreach($fruit as $one) { @$count[$one[‘color’]]++; } printf(“You have %d green fruit(s).\n”, $count[‘green’]); The alternative is to write yourself some little … Read more