A case study of key and Current,next in PHP _php techniques

This article illustrates the joint application of key and Current,next in PHP. Share to everyone for your reference, specific as follows:

Problem:

$ARRQ = Array ();
$ARRQ [' TUC '] = Array (' SSS ' => ' ewq ', ' shu ' => ' Sjkah ', ' saa ' => ' Dwjhaz ');
$ARRQ [' tucs '] = Array (' ssss ' => ' ewsq ', ' sqhu ' =>dwjhaz ', ' sa12a ' => ');
$ARRQ [' tuca '] = Array (' SSSD ' => ' ewqq ', ' shu2 ' => ' Sjkah ', ' saSa ' => ');

How do I get rid of duplicate values in a $ARRQ array without destroying the array structure?

idea : First the elements in the first two-dimensional array are output with the Array_unique function.
When you output an element from a second two-dimensional array, you first use Array_unique to process it, and then remove the element that already exists in the first two-dimensional array.
When you output the third, you first use the Array_unique process, and then remove the elements that already exist in the first and second two-dimensional combination set.
Analogy

In short, you first have to array_unqiue to weight, and then remove the elements of their own in the previous array elements in the same concentration.

The following is code:

<?php
$arrq = Array ();
$ARRQ [' TUC '] = Array (' SSS ' => ' ewq ', ' shu ' => ' Sjkah ', ' saa ' => ' Dwjhaz ');
$ARRQ [' tucs '] = Array (' ssss ' => ' ewsq ', ' sqhu ' => ' Dwjhaz ', ' sa12a ' => ');
$ARRQ [' tuca '] = Array (' SSSD ' => ' ewqq ', ' shu2 ' => ' Sjkah ', ' saSa ' => ');
$last =array (); Sets an empty array to compare while
($arr =current ($ARRQ)) {
  //echo key ($ARRQ);
  $tmp =array_unique ($arr); First clear each one-dimensional array itself the same value
  if (count ($last) ==0) {
    $last =array_merge ($last, $arr);//To merge the previous array that has gone heavy
  }
  Else {//Output
    //echo key ($ARRQ) for the remaining one-dimensional array;
    foreach ($arr as $ke => $va) {if
      in_array ($arr [$ke], $last))//If the existing element
      unset ($arrq [Key ($ARRQ)] [$ke]); /delete, where the key value of the array element is critical
    }
    $last =array_merge ($last, $arr);//change $last into a collection of the preceding array for the next comparison
  }
  next ($ ARRQ); The pointer is moved back so that the key function can be used to obtain a different $ARRQ subscript
}
//The following output processed array
foreach ($arrq as $arr) {
  foreach ($arr as $val) {
    echo $val. " ";
  }
  echo "<br>";
>

The results of the operation are:

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