在修改数组后找到新密钥

Question

I have this

array([0] => 4, [1] => 6, [2] => 8, [3] =>11);
$value = 6;//(refers to [1])

After the core code, my array COULD change becoming for example:

array([0] => 4, [1] => 8, [2] =>11);

I'd like to have a variable ($newvalue) set to the next value if the $value key has been removed ($newvalue=8), or stay the same ($newvalue=6) if 6 is still in the values of that array.

NB if $value is the last (11), and 11 has been removed, $newvalue should be set to 4.

To summarize:

$value = 11; /* array([0] => 4, [1] => 6, [2] => 8);            */ $newvalue = 4;
$value = 11; /* array([0] => 4, [1] => 6, [2] => 8, [3] => 11); */ $newvalue = 11;

Answer 1

Assuming that your array values are always in ascending order:

if (in_array($value, $the_array)) {
  $newvalue = $value;
} else if ($value > max($the_array)) {
  $newvalue = $the_array[0];
} else {
  foreach ($the_array as $v) {
    if ($v > $value) {
      $newvalue = $v;
      break;
    }
  }
}