如何从PHP多维数组中删除重复值?
示例数组:
Array
(
[0] => Array
(
[0] => abc
[1] => def
)
[1] => Array
(
[0] => ghi
[1] => jkl
)
[2] => Array
(
[0] => mno
[1] => pql
)
[3] => Array
(
[0] => abc
[1] => def
)
[4] => Array
(
[0] => ghi
[1] => jkl
)
[5] => Array
(
[0] => mno
[1] => pql
)
)
对于长度不受限制的(n)维数组,尝试此解决方案
比如这个数组
$arr= [
0 => [0=>"a" , 1=>"b" , 2=>"c" ] ,
1 => [0=>"x" , 1=>"b" , 2=>"a", 3=>"p"],
2=> [
[
0=>"y" ,
1=>"b" ,
2=> [0=>"x" , 1=>"m" , 2=>"a"]
],
1=>"z" ,
2=>"v"
]
];
这就是答案
$ar2=[];
$ar3=[];
function test($arr){
global $ar2,$ar3;
if(is_array($arr)){
return array_map("test",$arr);
}
if(!isset($ar2[$arr])){
$ar2[$arr]=1;
$ar3[]=$arr;
}
}
array_map("test",$arr);
print_r($ar3);
对此,array_unique()文档上的用户注释提供了许多解决方案。这是其中之一:
kenrbnsn at rbnsn dot com
27-Sep-2005 12:09
Yet another Array_Unique for multi-demensioned arrays. I've only tested this on two-demensioned arrays, but it could probably be generalized for more, or made to use recursion.
This function uses the serialize, array_unique, and unserialize functions to do the work.
function multi_unique($array) {
foreach ($array as $k=>$na)
$new[$k] = serialize($na);
$uniq = array_unique($new);
foreach($uniq as $k=>$ser)
$new1[$k] = unserialize($ser);
return ($new1);
}
这来自http://ca3.php.net/manual/en/function.array-unique.php#57202。