php數組排重

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數組中重複項的去除2010-07-28 15:29

一維數組的重複項：        使用array_unique函數即可，使用執行個體如下：                <?php                    $aa=array("apple","banana","pear","apple","wail","watermalon");                    $bb=array_unique($aa);                    print_r($bb);                 ?>        結果如下：Array ( [0] => apple [1] => banana [2] => pear [4] => wail [5] => watermalon ) 。 二維數組的重複項：       對於二維數組咱們分兩種情況討論，一種是因為某一鍵名的值不能重複，重複資料刪除項；另一種因為內部的一維數組不能完全相同，而重複資料刪除項，下面舉例說明：             ㈠因為某一鍵名的值不能重複，重複資料刪除項            <?php             function assoc_unique($arr, $key)              {                $tmp_arr = array();                foreach($arr as $k => $v)               {                  if(in_array($v[$key], $tmp_arr))//搜尋$v[$key]是否在$tmp_arr數組中存在，若存在返回true                 {                    unset($arr[$k]);                 }               else {                   $tmp_arr[] = $v[$key];                 }               }             sort($arr); //sort函數對數組進行排序             return $arr;             }             $aa = array(             array(‘id‘ => 123, ‘name‘ => ‘張三‘),             array(‘id‘ => 123, ‘name‘ => ‘李四‘),             array(‘id‘ => 124, ‘name‘ => ‘王五‘),             array(‘id‘ => 125, ‘name‘ => ‘趙六‘),             array(‘id‘ => 126, ‘name‘ => ‘趙六‘)             );             $key = ‘id‘;             assoc_unique(&$aa, $key);             print_r($aa);             ?>       顯示結果為：Array ( [0] => Array ( [id] => 123 [name] => 張三 ) [1] => Array ( [id] => 124 [name] => 王五 ) [2] => Array ( [id] => 125 [name] => 趙六 ) [3] => Array ( [id] => 126 [name] => 趙六 ) )         ㈡因內部的一維數組不能完全相同，而重複資料刪除項             <?php             function array_unique_fb($array2D){                  foreach ($array2D as $v){                      $v = join(",",$v); //降維,也可以用implode,將一維數群組轉換為用逗號串連的字串                      $temp[] = $v;                  }                  $temp = array_unique($temp);    //去掉重複的字串,也就是重複的一維數組                 foreach ($temp as $k => $v){                     $temp[$k] = explode(",",$v);   //再將拆開的數組重新組裝                 }                 return $temp;             }             $aa = array(             array(‘id‘ => 123, ‘name‘ => ‘張三‘),             array(‘id‘ => 123, ‘name‘ => ‘李四‘),             array(‘id‘ => 124, ‘name‘ => ‘王五‘),             array(‘id‘ => 123, ‘name‘ => ‘李四‘),             array(‘id‘ => 126, ‘name‘ => ‘趙六‘)             );             $bb=array_unique_fb($aa);             print_r($bb)             ?>           顯示結果：Array ( [0] => Array ( [0] => 123 [1] => 張三 ) [1] => Array ( [0] => 123 [1] => 李四 ) [2] => Array ( [0] => 124 [1] => 王五 ) [4] => Array ( [0] => 126 [1] => 趙六 ) )

php數組排重