Php assigns a value to the key of an empty ordered array

Php assigns an empty key of an ordered array an array =>

$arr = array(        '0' => 'a value',        '1' => 'a value',        '2' => 'a value',        '4' => 'a value',        '5' => 'a value',        '7' => 'a value',        '10' => 'a value',        '11' => 'a value',        '12' => 'a value',    );

At the same time, I have

$num

Assume that

$num=15

Now, I want to get this array =>

$arr = array(        '0' => 'a value',        '1' => 'a value',        '2' => 'a value',        '3' => 'kong',        '4' => 'a value',        '5' => 'a value',        '6' => 'kong',        '7' => 'a value',        '8' => 'kong',        '9' => 'kong',        '10' => 'a value',        '11' => 'a value',        '12' => 'a value',        '13' => 'kong',        '14' => 'kong',        '15' => 'kong',    );

Is there any convenient and fast way to generate this array?

Reply to discussion (solution)

$ Arr = array ('0' => 'A value', '1' => 'A value', '2' => 'A value ', '4' => 'A value', '5' => 'A value', '7' => 'A value', '10' => 'A value ', '11' => 'A value', '12' => 'A value',); $ num = 15; $ tmp = range (0, $ num ); $ keys = array_keys ($ arr); $ kongArr = array_fill_keys (array_diff ($ tmp, $ keys), 'Kong '); // because it is a digital index, if array_merge is used, indexes are re-indexed and cannot be sorted by foreach ($ kongArr as $ k => $ v) {$ arr [$ k] = $ v;} ksort ($ arr ); echo"
";print_r($arr);echo "
"; /* Array ([0] => a value [1] => a value [2] => a value [3] => kong [4] => a value [5] => a value [6] => kong [7] => a value [8] => kong [9] => kong [10] => a value [11] => a value [12] => a value [13] => kong [14] => kong [15] => kong) */

Not that complicated

$arr = array(  '0' => 'a value',  '1' => 'a value',  '2' => 'a value',  '4' => 'a value',  '5' => 'a value',  '7' => 'a value',  '10' => 'a value',  '11' => 'a value',  '12' => 'a value',);$num = 15;$b = $arr + array_fill(0, $num+1, 'kong');ksort($b);print_r($b);

Array(    [0] => a value    [1] => a value    [2] => a value    [3] => kong    [4] => a value    [5] => a value    [6] => kong    [7] => a value    [8] => kong    [9] => kong    [10] => a value    [11] => a value    [12] => a value    [13] => kong    [14] => kong    [15] => kong)