Detailed graphic explanation of the method of converting an array vertically to horizontally and filtering duplicate values ​​in PHP

This article mainly introduces the method of PHP to realize vertical conversion of arrays to horizontal and filter duplicate values. Combined with specific examples, it compares and analyzes PHP's operating skills related to array traversal, conversion and deduplication. Friends who need it can refer to it

The details are as follows:

1. Question

There is an array:

array(
  6=>array(5=>'黑xx', 42=>'XXL'),
  7=>array(5=>'黑xx', 40=>'XL'),
  8=>array(8=>'灰',  40=>'XL'),
);

is required to be converted into the following result (the array is turned vertically and horizontally and duplicate values ​​are filtered):

array(
  0=>array(5=>'黑xx', 8=>'灰'),
  1=>array(42=>'XXL', 40=>'XL'),
);

2. Solution:

Method 1:

$a = array(
  6=>array(5=>'黑xx', 42=>'XXL'),
  7=>array(5=>'黑xx', 40=>'XL'),
  8=>array(8=>'灰',  40=>'XL'),
);
foreach($a as $r) {
 $b[key($r)] = current($r);
 next($r);
 $c[key($r)] = current($r);
}
$b = array($b, $c);
print_r($b);

Method 2:

$arr = array(
  6=>array(5=>'黑xx', 42=>'XXL'),
  7=>array(5=>'黑xx', 40=>'XL'),
  8=>array(8=>'灰',  40=>'XL'),
);
$result = array();
foreach($arr as $a){
  $keys = array_keys($a);
  $vals = array_values($a);
  $result[0][$keys[0]] = $vals[0];
  $result[1][$keys[1]] = $vals[1];
}
print_r($result);

The simplest Writing method:

$a = array(
  6=>array(5=>'黑xx', 42=>'XXL'),
  7=>array(5=>'黑xx', 40=>'XL'),
  8=>array(8=>'灰',  40=>'XL'),
);
foreach($a as $r) {
 $i = 0;
 while(list($k, $v) = each($r)) $b[$i++][$k] = $v;
}
print_r($b);

The final running results are:

Array
(
  [0] => Array
    (
      [5] => 黑xx
      [8] => 灰
    )
  [1] => Array
    (
      [42] => XXL
      [40] => XL
    )
)

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