How to check if an array is finite?

Question

PHP

Good afternoon, I need to conditionally check whether I have reached the end of the array $arr['i'] and $arr['j'] (they have different lengths), if I have reached then I need to perform some actions. Can you tell me how to check whether the array has reached the end? It is not possible to check using a loop, because there, according to the conditions, the necessary elements are formed into a new array, and removed from the current one, and the current array is cycled through the loop until it becomes empty.

Answer 1

A little review... and refactoring.

$iter = ceil((count($data[$arrCenter[$i]]['j']) + count($data[$arrCenter[$i]]['i'])) / 2) + ceil($w / $machin);

// Зачем вам индексированый массив?
for ($a = 0; $a < $iter; $a++) {

    // Где проверка на существование $data[$arrCenter[$i]]['i'][$a] $data[$arrCenter[$i]]['j'][$a] ?
    
    $center = $arrCenter[$i];
    $arrayI = $data[$center]['i'][$a];
    $arrayJ = $data[$center]['j'][$a];
    
    // !$var === ($var == 0 || $var == '')
    if (!$arrayJ['order'] && !$arrayI['order']) {
        
        if (($arrayI['weight'] + $arrayJ['weight']) <= $machin) {

            $weight[$a] = $arrayI['weight'] + $arrayJ['weight'];
            
            array_unshift($path[$center][$c], $arrayI['name']);
            
            // use buffer
            echo $arrayJ['name'] . '<br/>';
            
            // array_push(...) === $var[] = $value
            $path[$center][$c][] = $arrayJ['name'];
            
            unset($data[$center]['i'][$a], $data[$center]['j'][$a]);
        }
    }
    //                  ^
    //                  |
    // +----------------
    // |
    // Вы только что их убили.  +-- Где проверка на существование?
    //                          |
    //                          V

    if ($data[$arrCenter[$i]]['j'][$a]['order'] < $data[$arrCenter[$i]]['i'][$a]['order']) {
        // ...
    }

As for the next element in the array.
Are you confused yourself?
Expand the line and you will see:

if (
            (
                !next($data[$arrCenter[$i]]['j']) && 
                !next($data[$arrCenter[$i]]['i']) && 
                (
                    !empty($data[$arrCenter[$i]]['j']) && 
                    !empty($data[$arrCenter[$i]]['j'])
                )
            )
    ) {
        // ...
    } else {
        // ...
    }

Warning
This function can return either boolean FALSE or a non-boolean value that casts to FALSE. See Boolean type for more information. Use the === operator to test the value returned by this function.
Simplify...

if (
        false === next($data[$arrCenter[$i]]['j']) && 
        false === next($data[$arrCenter[$i]]['i'])
    ) {
        // ...
    } else {
        // ...
    }

Clean up your code.
Use temporary variables.
Since you "kill" by index, check for existence later in the code.

Answer 2

If to check not in a cycle that where? After the infinite loop, or before it? :)
I hope I understood the task correctly

do {
 // some code
} while (!empty($array))

But all in all it's weird.

Answer 3

I wrote the code myself, so I didn’t really want to spread it, the bike. This is the final stage of the Clark-Wright algorithm. Here I check the finiteness of arrays like this

!next($data[$arrCenter[$i]]['j']) && !next($data[$arrCenter[$i]]['i']

but it doesn't work correctly.

$machin = 1200;
$iter = ceil((count($data[$arrCenter[$i]]['j']) + count($data[$arrCenter[$i]]['i'])) / 2) + ceil($w / $machin);

                    for($a=0;$a<$iter;$a++){

                            if($data[$arrCenter[$i]]['j'][$a]['order'] == 0 && $data[$arrCenter[$i]]['i'][$a]['order'] == 0){

                                if(($data[$arrCenter[$i]]['i'][$a]['weight'] + $data[$arrCenter[$i]]['j'][$a]['weight']) <= $machin) {
//проверяем вес, если меньше допустимого, записываем точку пути в новый массив и удаляем данный элемент с текущего
                                    $weight[$a] = $data[$arrCenter[$i]]['i'][$a]['weight'] + $data[$arrCenter[$i]]['j'][$a]['weight'];

                                    array_unshift($path[$arrCenter[$i]][$c], $data[$arrCenter[$i]]['i'][$a]['name']);
                                    unset($data[$arrCenter[$i]]['i'][$a]);
                                    echo $data[$arrCenter[$i]]['j'][$a]['name'];echo "<br/>";
                                    array_push($path[$arrCenter[$i]][$c], $data[$arrCenter[$i]]['j'][$a]['name']);
                                    unset($data[$arrCenter[$i]]['j'][$a]);

                                }
                            }

                            if($data[$arrCenter[$i]]['j'][$a]['order'] < $data[$arrCenter[$i]]['i'][$a]['order']){
                                //проверяем вес, если меньше допустимого, записываем точку пути в новый массив и удаляем данный элемент с текущего
                                if((array_sum($weight) + $data[$arrCenter[$i]]['j'][$a]['weight']) <= $machin) {

                                    $weight[$a] = array_sum($weight) + $data[$arrCenter[$i]]['j'][$a]['weight'];

                                    array_push($path[$arrCenter[$i]][$c], $data[$arrCenter[$i]]['j'][$a]['name']);
                                    unset($data[$arrCenter[$i]]['j'][$a]);

                                }
//проверяем вес, если меньше допустимого, записываем точку пути в новый массив и удаляем данный элемент с текущего
                                if((array_sum($weight) + $data[$arrCenter[$i]]['i'][$a]['weight']) <= $machin){

                                    $weight[$a] = array_sum($weight) + $data[$arrCenter[$i]]['i'][$a]['weight'];

                                    array_unshift($path[$arrCenter[$i]][$c], $data[$arrCenter[$i]]['i'][$a]['name']);
                                    unset($data[$arrCenter[$i]]['i'][$a]);

                                }

                            }


                            if($data[$arrCenter[$i]]['i'][$a]['order'] < $data[$arrCenter[$i]]['j'][$a]['order']){
                                //проверяем вес, если меньше допустимого, записываем точку пути в новый массив и удаляем данный элемент с текущего
                                if((array_sum($weight) + $data[$arrCenter[$i]]['i'][$a]['weight']) <= $machin) {

                                    $weight[$a] = array_sum($weight) + $data[$arrCenter[$i]]['i'][$a]['weight'];
                                    array_unshift($path[$arrCenter[$i]][$c], $data[$arrCenter[$i]]['i'][$a]['name']);
                                    unset($data[$arrCenter[$i]]['i'][$a]);

                                }
//проверяем вес, если меньше допустимого, записываем точку пути в новый массив и удаляем данный элемент с текущего
                                if((array_sum($weight) + $data[$arrCenter[$i]]['j'][$a]['weight']) <= $machin){
                                    $weight[$a] = array_sum($weight) + $data[$arrCenter[$i]]['j'][$a]['weight'];
                                    array_push($path[$arrCenter[$i]][$c], $data[$arrCenter[$i]]['j'][$a]['name']);
                                    unset($data[$arrCenter[$i]]['j'][$a]);

                                }
                            }
//если дошли до конца текущих массивов и они не пустые обнуляем значения
                        if ((!next($data[$arrCenter[$i]]['j']) && !next($data[$arrCenter[$i]]['i']) && (!empty($data[$arrCenter[$i]]['j']) && !empty($data[$arrCenter[$i]]['j'])))){
                            $a = -1;
                            $weight = array();
                            $data[$arrCenter[$i]]['j']=array_values($data[$arrCenter[$i]]['j']);
                            $data[$arrCenter[$i]]['i']=array_values($data[$arrCenter[$i]]['i']);
                            $c++;
                            $path[$arrCenter[$i]][$c] = array();
                            $iter = ceil((count($data[$arrCenter[$i]]['j']) + count($data[$arrCenter[$i]]['i'])) / 2);
                        }
                        else{
                            break;
                        }
                    }