associative

问题 I'm trying to accomplish something using an associative array as suggested somewhere else here on Stackoverflow, but I've never used arrays so I'm struggling. I've looked it up but only to be left more confused than I was! Here's the deal: I want to display a random image as the background of a Worpdress site, AND show the name of the photographer who took the image as well. So I've created a function that includes an associative array that associates the image with the photographer, and a

问题 I'm building a class that has a slightly asymmetric addition. Before the complaints come in, it's necessarily asymmetric. There is a conversion (operation that takes a bit of time) that has to happen when two objects are added together, and the conversion most naturally happens with respect to the right summand. To make this concrete, here's a generic example of what's going on... class Foo { char _fav; int _prop; public: const char fav() const {return _fav;} const int prop() const (return

问题 Since C++14 we have std::less<void> that is transparent and more usefull in most cases, so is there reasons why, for example, std::set still has std::less<Key> as a predicate by default, not an std::less<void> except historical reasons. Useful cases: std::set<std::string>::find with std::string_view , etc. 回答1: It would break current working code to do so. Imagine I have struct my_type { int id; int bar; }; namespace std { template<> struct less<my_type> { bool operator()(my_type const& lhs,

问题 Since C++14 we have std::less<void> that is transparent and more usefull in most cases, so is there reasons why, for example, std::set still has std::less<Key> as a predicate by default, not an std::less<void> except historical reasons. Useful cases: std::set<std::string>::find with std::string_view , etc. 回答1: It would break current working code to do so. Imagine I have struct my_type { int id; int bar; }; namespace std { template<> struct less<my_type> { bool operator()(my_type const& lhs,

问题 I'm struggling to explain what I want to do here so apologies if I confuse you.. I'm just as confused myself I have an array like so: $foo = array( array('value' => 5680, 'text' => 'Red'), array('value' => 7899, 'text' => 'Green'), array('value' => 9968, 'text' => 'Blue'), array('value' => 4038, 'text' => 'Yellow'), ) I want to check if the array contains the value e.g. 7899 and also get the text linked to that value "Green" in the example above. 回答1: Try something like this $foo = array(

问题 I want to access the index 'memo' in the associative array in PHP below $variables["thelistitems"]; print_r($variables["thelistitems"]); Output Array ( [0] => Array ( [productid] => prod:c6dbdd62-dc13-6421-5a94-c8cd871a59d3 [memo] => dummy [taxable] => 0 [unitweight] => 0 [unitcost] => 450.02 [unitprice] => 445.02 [quantity] => 1 ) ) 回答1: What you essentially have is an array of associative arrays. So to access the first memo, it's $variables["thelistitems"][0]["memo"] To access each memo,

问题 ok, so I have an object like: var myobject = { "field_1": "lorem ipsum", "field_2": 1, "field_2": 2, "field_2": 6 }; as you see there are duplicate names in the object, but with different values. If i go through it like (using jQuery): $.each(myobject, function(key, value) { console.log(key); console.log(myobject[key]); console.log(myobject[value]); } key - returns the correct key myobject[key] - returns the name for that key myobject[value] - returns the last elements', with that name, value

问题 I want to create a master-detail page using PHP. Rather than getting data from a MYSQL database, I want to get the data from an associative array. Is this possible? The data will first be obtained from the mysql database table and stored inside an associative array for some processing. Now I want to create a master detail page based on the data inside the associative array alone. Anyone with Ideas? 回答1: It's just impossible, due to PHP nature. PHP script being run for a fraction of second and

问题 How can I merge this three arrays $name ={"Tom", "John", "David"}; $v1 = {"Tom":100, "David":200}; $v2 = {"John":500, "Tom":400}; into one multidimensional associative array in two different ways? One way is the key order should be same as that of array "name". $name_merged_original_order = array ( "Tom" => Array( "v1" => 100, "v2" => 400 ), "John" => Array( "v1" => "N/A", "v2" => 500 ), "David" => Array( "v1" => 100, "v2" => "N/A" ) ) Another ways is the alphabetical of array "name": $name

问题 I have this array $myArray=array( 'a'=>array('id'=>1,'text'=>'blabla1'), 'b'=>array('id'=>2,'text'=>'blabla2'), 'c'=>array('id'=>3,'text'=>'blabla3'), 'd'=>array('id'=>4,'text'=>'blabla4'), ); and i want to sort the above array by the keys a,b,c,d, who exist in another array: $tempArray=array('c','a','d','b'); How can I do that so the $myArray looks like this: $myArray=array( 'c'=>array('id'=>3,'text'=>'blabla3'), 'a'=>array('id'=>1,'text'=>'blabla1'), 'd'=>array('id'=>4,'text'=>'blabla4'),