I want to get the value before and after a specific value of an array in PHP.
For example I have:
$array = (441, 212, 314, 406);
And my $specific_value is 441.
In this example I should get the before (406) and after (212).
If my value is 212 I should be get the before (441) and after (314).
Solution using array_search function:
$array = [441, 212, 314, 406];
$val = 441;
$currentKey = array_search($val, $array);
//Check for possible bool value returned by array_search
//Check for possible random index values
if(!is_bool($currentKey) & array_is_list($array)) {
$before = $array[$currentKey ? $currentKey-1 : count($array)-1];
$after = $array[($currentKey != count($array)-1) ? $currentKey+1 : key($array)];
}
var_dump($before, $after);
The output:
int(406)
int(212)
$key = array_search ('441', $arr);
$beforeKey = $key-1;
if($beforeKey<1)
{ $beforeKey = count($array)-1; }
$afterKey = $key+1;
$beforeValue = $array[$beforeKey];
$afterValue = $array[$afterKey];
for recursive keys after a search may want something like this:
function get_all_after_array_key($array,$key){
$currentKey = array_search($key, array_keys($array));
$hasNextKey = (isset($array[$currentKey + 1])) ? TRUE : FALSE;
$array = array_keys($array);
$after = [];
do {
if(isset($array[$currentKey + 1])) {
$hasNextKey = TRUE;
$after[] = $array[$currentKey + 1];
$currentKey = $currentKey + 1;
} else {
$hasNextKey = FALSE;
}
} while($hasNextKey == TRUE);
return $after;
}
