Delete instances of removing identical elements and array duplicate values ​​in a two-dimensional array

function assoc_title($arr, $key)
{
    $tmp_arr = array();
    foreach ($arr as $k => $v) {
        if (in_array($v[$key], $tmp_arr)) {
            unset($arr[$k]);
        } else {
            $tmp_arr[] = $v[$key];
        }
    }
    return $arr;
}//assoc_title end
 
$key_title = 'stu_name';
$quchong = assoc_title($teachers, $key_title);
 
 
echo "<table border=\"1\" bordercolor=\"#CCCCCC\" cellpadding=\"0\" cellspacing=\"0\" style=\"border-collapse:collapse\" width=\"20%\">";
echo "<tr><td>id</td><td>学生名</td><td>电话</td></tr>";
$i = 1;
foreach ($quchong as $key => $vale) {
    if ($vale[&#39;stu_name&#39;] == "游开琳" or $vale[&#39;stu_name&#39;] == "韩建通") {
 
        continue;
    }
 
    echo "<tr><td>{$i}</td><td>{$vale[&#39;stu_name&#39;]}</td><td>{$vale[&#39;tel&#39;]}</td></tr>";
    $i++;
 
}
 
echo "</table>";