对于如下二维数组,要求对其进行去重:
$arr = array(
'0'=>array(
'name'=>'james',
'age'=>30,
),
'1'=>array(
'name'=>'susu',
'age'=>26,
),
'2'=>array(
'name'=>'james',
'age'=>30,
),
'new'=>array(
'name'=>'kube',
'age'=>37,
),
'list'=>array(
'name'=>'kube',
'age'=>27,
),
);
1、 二维数组内部的一维数组中的值不能完全相同,删除其中重复的项:
代码如下:
array(
'name'=>'james',
'age'=>30,
),
'1'=>array(
'name'=>'susu',
'age'=>26,
),
'2'=>array(
'name'=>'james',
'age'=>30,
),
'new'=>array(
'name'=>'kube',
'age'=>37,
),
'list'=>array(
'name'=>'kube',
'age'=>27,
),
);
printf("Before tranform the array:
"); //输出原来的数组
print_r($arr);
echo "
";
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 $temp[]即为不保留原来键值
}
printf("After split the array:
");
print_r($temp); //输出拆分后的数组
echo"
";
$temp =array_unique($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:
");
print_r($arr_new);
echo "
";
?>
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*/
$v)
{
if(in_array($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,$key);
printf("As for the givenkey->%s:
",$key);
print_r($arr_key);
echo "
";
?>
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 ) )