Home Backend Development PHP Tutorial PHP二维数组去重的方法(保留各个键值的同时去除重复的项) 二维数组的唯一性

PHP二维数组去重的方法(保留各个键值的同时去除重复的项) 二维数组的唯一性

Jun 23, 2016 pm 01:27 PM

对于如下二维数组,要求对其进行去重:

$arr = array(          '0'=>array(                    'name'=>'james',                    'age'=>30,                    ),          '1'=>array(                    'name'=>'susu',                    'age'=>26,                    ),          '2'=>array(                    'name'=>'james',                    'age'=>30,                    ),          'new'=>array(                    'name'=>'kube',                    'age'=>37,                    ),          'list'=>array(                    'name'=>'kube',                    'age'=>27,                    ),          );
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1、 二维数组内部的一维数组中的值不能完全相同,删除其中重复的项:

代码如下:

<?php $arr = array(          '0'=>array(                   'name'=>'james',                   'age'=>30,                   ),          '1'=>array(                   'name'=>'susu',                   'age'=>26,                   ),           '2'=>array(                   'name'=>'james',                   'age'=>30,                   ),           'new'=>array(                   'name'=>'kube',                   'age'=>37,                   ),           'list'=>array(                   'name'=>'kube',                   'age'=>27,                   ),           );printf("Before tranform the array:<br>");   //输出原来的数组print_r($arr);echo "<br>";function more_array_unique($arr=array()){    foreach($arr[0] as $k => $v){        $arr_inner_key[]= $k;   //先把二维数组中的内层数组的键值记录在在一维数组中    }    foreach ($arras $k => $v){        $v =join(",",$v);    //降维 用implode()也行        $temp[$k] =$v;      //保留原来的键值 $temp[]即为不保留原来键值    }    printf("After split the array:<br>");    print_r($temp);    //输出拆分后的数组    echo"<br>";    $temp =array_unique($temp);    //去重:去掉重复的字符串    foreach ($tempas $k => $v){        $a = explode(",",$v);   //拆分后的重组 如:Array( [0] => james [1] => 30 )        $arr_after[$k]= array_combine($arr_inner_key,$a);  //将原来的键与值重新合并    }    //ksort($arr_after);//排序如需要:ksort对数组进行排序(保留原键值key) ,sort为不保留key值    return$arr_after;}    $arr_new = more_array_unique($arr);  //调用去重函数    printf("Duplicate removal of the array:<br>");    print_r($arr_new);echo "<br>";?>
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输出结果:

Before tranform the array:   //原来数组
Array ( [0] => Array ( [name] => james [age] => 30 ) [1] => Array ([name] => susu [age] => 26 ) [2] => Array ( [name] => james [age]=> 30 ) [new] => Array ( [name] => kube [age] => 37 ) [list] =>Array ( [name] => kube [age] => 27 ) ) 
After split the array:  //拆分后数组
Array ( [0] => james,30 [1] => susu,26 [2] => james,30 [new] =>kube,37 [list] => kube,27 ) 
Duplicate removal of thearray:  //去重后数组
Array ( [0] => Array ( [name] => james [age] => 30 ) [1] => Array ([name] => susu [age] => 26 ) [new] => Array ( [name] => kube [age]=> 37 ) [list] => Array ( [name] => kube [age] => 27 ) ) 

 

2、 二维数组内部的一维数组因某一个键值不能相同,删除重复项:

/*针对某一个键值来进行去重*/

<?php $arr= array(……);  //同上的二维数组functionsecond_array_unique_bykey($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]); //销毁一个变量  如果$tmp_arr中已存在相同的值就删除该值        }        else {            $tmp_arr[$k] = $v[$key];  //将不同的值放在该数组中保存        }   }   //ksort($arr); //ksort函数对数组进行排序(保留原键值key)  sort为不保留key值    return $arr;   }   $key ='name';   $arr_key = second_array_unique_bykey($arr,$key);   printf("As for the givenkey->%s:<br>",$key);   print_r($arr_key);   echo "<br>";?>
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输出结果:

As for the given key->name:
Array ( [0] => Array ( [name] => james [age] => 30 ) [1] => Array ([name] => susu [age] => 26 ) [new] => Array ( [name] => kube [age]=> 37 ) ) 

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