Looking for an optimized version of this algorithm! ! ! !

problems encountered in the project.
There are several small arrays in a large array, but the small arrays may be repeated, and the interface needs to return a non-duplicate array structure. I tried the built-in function array_merge() in PHP, but it cannot sort small arrays. Here's how I use it. I can only say that the efficiency is very low. If you see this article and have a good method, please tell me. :)
//$hotel_setting may contain repeated large arrays.
The small array structure is array('hotel_adt_cnt'=>'','hotel_chd_cnt'=>'');

$hotel_unique = array();
 while ( 1 ) {

 $cmp = array_shift( $hotel_setting );
 $repeat = false;
 foreach ( $hotel_setting as $val ) {
 if ( $val[ 'hotel_adt_cnt'] == $cmp['hotel_adt_cnt'] && $val['hotel_chd_cnt'] == $cmp['hotel_chd_cnt']) {
 $repeat = true;
 break;
 }
 }

 if(! $repeat)
 {
 $hotel_unique[] = $cmp;
 }

 if ( count( $hotel_setting ) == 0 ) {
 break;
 }
 }
 $hotel_setting = $hotel_unique;