The calculation of an array value vacancy, how to solve

Calculation of an empty array value
If the array value is
$a =array (' 1 ', ' 8 ', ' 2 ', ' 3 ', ' 11 ');
To figure out 11 of those 4,5,6,7,9,10 that have not yet existed in the array how to calculate?

Because the maximum value of this array can be any number of 11, it is necessary to determine the value that is smaller than he is based on the maximum value and those that are not in the array ....

------Solution--------------------

PHP Code

$a =array (' 1 ', ' 8 ', ' 2 ', ' 3 ', ' one '); $b = range ($a [0], $a [count ($a)-1]); $result = Array_diff ($b, $a); The missing value, that is, the difference set of $b and $ A print_r ($result);
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