Home >php教程 >php手册 >PHP数组的使用

PHP数组的使用

WBOY
WBOYOriginal
2016-06-06 19:53:231256browse

一维数组的重复项 : 使用array_unique函数即可,使用实例如下: ?php $aa=array(apple,banana,pear,apple,wail,watermalon); $bb=array_unique($aa); print_r($bb); ? 结果如下:Array ( [0] = apple [1] =banana [2] = pear [4] = wail [5]= watermalon )

一维数组的重复项

      使用array_unique函数即可,使用实例如下:

              

<?php $aa=array("apple","banana","pear","apple","wail","watermalon");
                  $bb=array_unique($aa);
                  print_r($bb);
               ?>

      结果如下:Array ( [0] => apple [1] =>banana [2] => pear [4] => wail [5]=> watermalon ) 。

二维数组的重复项

     对于二维数组咱们分两种情况讨论,一种是因为某一键名的值不能重复,删除重复项;另一种因为内部的一维数组不能完全相同,而删除重复项,下面举例说明:

           ㈠因为某一键名的值不能重复,删除重复项

         

 <?php function assoc_unique($arr, $key)
            {
              $tmp_arr = array();
              foreach($arr as $k => $v)
             {
                if(in_array($v[$key],$tmp_arr))//搜索$v[$key]是否在$tmp_arr数组中存在,若存在返回true
               {
                  unset($arr[$k]);
               }
             else {
                 $tmp_arr[] = $v[$key];
               }
             }
           sort($arr); //sort函数对数组进行排序
           return $arr;
           }

           $aa = array(
           array('id' => 123, 'name' =>'张三'),
           array('id' => 123, 'name' =>'李四'),
           array('id' => 124, 'name' =>'王五'),
           array('id' => 125, 'name' =>'赵六'),
           array('id' => 126, 'name' =>'赵六')
           );
           $key = 'id';
           assoc_unique(&$aa, $key);
           print_r($aa);
           ?>

     显示结果为:Array ( [0] => Array ( [id] =>123 [name] => 张三 ) [1] => Array ([id] => 124 [name] => 王五 ) [2]=> Array ( [id] => 125 [name]=> 赵六 ) [3] => Array ( [id]=> 126 [name] => 赵六 ) )

       ㈡因内部的一维数组不能完全相同,而删除重复项

         

<?php function array_unique_fb($array2D){
                foreach ($array2D as $v){
                    $v = join(",",$v); //降维,也可以用implode,将一维数组转换为用逗号连接的字符串
                    $temp[] = $v;
                }
                $temp =array_unique($temp);   //去掉重复的字符串,也就是重复的一维数组
               foreach ($temp as $k => $v){
                   $temp[$k] = explode(",",$v);  //再将拆开的数组重新组装
               }
               return $temp;
           }

           $aa = array(
           array('id' => 123, 'name' =>'张三'),
           array('id' => 123, 'name' =>'李四'),
           array('id' => 124, 'name' =>'王五'),
           array('id' => 123, 'name' =>'李四'),
           array('id' => 126, 'name' =>'赵六')
           );
           $bb=array_unique_fb($aa);
           print_r($bb)
           ?>

  

         显示结果:Array ( [0] => Array ( [0] =>123 [1] => 张三 ) [1] => Array ( [0]=> 123 [1] => 李四 ) [2]=> Array ( [0] => 124 [1]=> 王五 ) [4] => Array ( [0]=> 126 [1] => 赵六 ))  

Statement:
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn