A simple example of php three-dimensional array deduplication

// Create a new empty array.
$tmp_array = array();
$new_array = array();
// 1. Loop out all the rows. ($val is a certain row)
foreach($my_array as $k => $val){
 $hash = md5(json_encode($val));
 if (in_array($hash, $tmp_array)) {
 echo('This row already exists');
 }else{ // bbs.it-home.org
 // 2. In the body of the foreach loop, assign the hash of each row of array objects to the temporary array中.
 $tmp_array[] = $hash;
 $new_array[] = $val;
 }
}
print_r($new_array);
//$new_array is none after filtering Array of repeated data.