PHP implements one-dimensional array and two-dimensional array de-weight function

This article mainly introduces PHP implementation of a one-dimensional array and two-dimensional array de-weight function, combined with examples of PHP for a one-dimensional array and two-dimensional array traversal, judgment, sorting, weight and other related operations skills, the need for friends can refer to the next

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The removal of duplicates in an array

Duplicate entries for one-dimensional arrays:

Using array_unique the function, use the following example:

<?php  $aa =array ("1", "2", "3", "3", "2", "Watermalon");  $BB =array_unique ($AA);  Print_r ($BB);? >

The results are as follows:

Array ([0] = 1 [1] = 2 [2] = 3 [5] = = Watermalon)

Duplicate entries for two-dimensional arrays:

For a two-dimensional array we can be discussed in one way or another because the value of one key name cannot be duplicated, and the other is because the inner one-dimensional array cannot be identical and the duplicates are deleted, the following example illustrates:

Delete duplicates because the value of a key name cannot be duplicated

<?phpfunction Assoc_unique ($arr, $key) {  $tmp _arr = Array ();  foreach ($arr as $k + $v)  {    if (In_array ($v [$key], $tmp _arr))//Search $v[$key] is present in the $tmp_arr array, if present returns True    {     unset ($arr [$k]);    }    else {     $tmp _arr[] = $v [$key];    }  }  Sort ($arr); Sort function sorts the array to  return $arr;} $AA = Array (  ' shopid ' + 1), array ('  shopid ' = + 1),  array (' shopid ' = 2),  Array (' Shopid ' + 2); $key = ' id '; $result = Assoc_unique ($aa, $key);p Rint_r ($result);? >

The results shown are:

Array ([0] = = Array ([shopid] = 1) [1] = = Array ([shopid] = 2))

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