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
)
)
当前回答
如果你有一个这样的数组:
(users是数组的名称)
Array=>
[0] => (array)
'user' => 'john'
'age' => '23'
[1] => (array)
'user' => 'jane'
'age' => '20'
[2]=> (array)
'user' => 'john'
'age' => '23'
如果你想删除重复的文件，那么:
$serialized = array();
for ($i=0; $i < sizeof($users); $i++) {
$test = in_array($users['user'], $serialized);
if ($test == false) {
$serialized[] = $users['user'];
}
}
可以是一个解决方案:P
其他回答
如果你有一个这样的数组:
(users是数组的名称)
Array=>
[0] => (array)
'user' => 'john'
'age' => '23'
[1] => (array)
'user' => 'jane'
'age' => '20'
[2]=> (array)
'user' => 'john'
'age' => '23'
如果你想删除重复的文件，那么:
$serialized = array();
for ($i=0; $i < sizeof($users); $i++) {
$test = in_array($users['user'], $serialized);
if ($test == false) {
$serialized[] = $users['user'];
}
}
可以是一个解决方案:P
唯一一个多维数组的简单而合理的方法如下:
如果你有一个这样的数组:
Array
(
[Key1] => Array
(
[0] => Value1
[1] => Value2
[2] => Value1
[3] => Value3
[4] => Value1
)
[Key2] => Array
(
[0] => Value1
[1] => Value2
[2] => Value1
[3] => Value3
[4] => Value4
)
)
使用foreach来解决这个问题:
foreach($array as $k=>$v){
$unique=array_unique($v);
$array[$k]=$unique;
}
它会给你以下结果:
Array
(
[Key1] => Array
(
[0] => Value1
[1] => Value2
[3] => Value3
)
[Key2] => Array
(
[0] => Value1
[1] => Value2
[3] => Value3
[4] => Value4
)
)
如果你想重新排列键的顺序，
foreach($array as $k=>$v){
$unique= array_values(array_unique($v));
$array[$k]=$unique;
}
这个操作会给你这样排列的键值:
Array
(
[Key1] => Array
(
[0] => Value1
[1] => Value2
[2] => Value3
)
[Key2] => Array
(
[0] => Value1
[1] => Value2
[2] => Value3
[3] => Value4
)
)
我希望这能澄清一切。
对此，array_unique()文档上的用户注释提供了许多解决方案。这是其中之一:
kenrbnsn at rbnsn dot com 27-Sep-2005 12:09 Yet another Array_Unique for multi-demensioned arrays. I've only tested this on two-demensioned arrays, but it could probably be generalized for more, or made to use recursion. This function uses the serialize, array_unique, and unserialize functions to do the work. function multi_unique($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。
如果您需要消除特定键上的重复项，例如mysqli id，这里有一个简单的函数
function search_array_compact($data,$key){
$compact = [];
foreach($data as $row){
if(!in_array($row[$key],$compact)){
$compact[] = $row;
}
}
return $compact;
}
加分 您可以传递一个键数组并添加一个外部foreach，但每增加一个键将慢2倍。
Array
(
[0] => Array
(
[id] => 1
[name] => john
)
[1] => Array
(
[id] => 2
[name] => smith
)
[2] => Array
(
[id] => 3
[name] => john
)
[3] => Array
(
[id] => 4
[name] => robert
)
)
$temp = array_unique(array_column($array, 'name'));
$unique_arr = array_intersect_key($array, $temp);
这将从数组中删除重复的名称。按键唯一
