Improve array_unique($array) function

After the improvement, you no longer need to traverse according to the length of the array before processing, but directly traverse according to the length of the array after processing

function unique($array)
{
sort($array);
$arraylength=count($array);
$endarray=array();
for ($i=0;$i<$arraylength ;$i++)
{
if ($i!="0")
{
$nextvalue=$array[$i-1];
}else{
$nextvalue="";
}
if ($i !=$arraylength)
{
$prevalue=$array[$i+1];
}else{
$prevalue="";
}
$currentvalue=$array[$i];
if($currentvalue= =$nextvalue||$currentvalue==$prevalue)
{
unset($array[$i]);
}else{
$endarray[]=$array[$i];
continue;
}
}
 $array=$endarray;
return $array;
}