[英]php remove duplicates from multidimensional array by value
我想從list_title
看到,按值刪除重復list_title
。 我知道有幾個問題和答案,但他們的解決方案對我不起作用。
這是我嘗試過的:
$uniqueArray = array_map("unserialize", array_unique(array_map("serialize", $notify)));
結果:
Array
(
[0] => Array
(
[list_id] => 86
[list_reference] => 130948
[list_title] => Offer: apartment 2+kk
[list_city] => Prague
[list_date] => 2017-03-03 11:20:35
[list_status] => 0
[list_creator] => Company A
[list_price] => 30000
[list_furniture] => ["1","0","0"]
[list_accommodation] => flat
)
[1] => Array
(
[list_id] => 87
[list_reference] => 130947
[list_title] => Offer: apartment 2+kk
[list_date] => 2017-03-03 11:20:35
[list_status] => 0
[list_creator] => Company B
[list_price] => 30000
[list_furniture] => ["1","0","0"]
[list_accommodation] => flat
)
[2] => Array ...
由於標題,預期結果應該是其中之一:
Array
(
[0] => Array
(
[list_id] => 86
[list_reference] => 130948
[list_title] => Offer: apartment 2+kk
[list_city] => Prague
[list_date] => 2017-03-03 11:20:35
[list_status] => 0
[list_creator] => Company A
[list_price] => 30000
[list_furniture] => ["1","0","0"]
[list_accommodation] => flat
)
所以基本上你想通過'list_title'
列刪除重復項。 讓我們假設我們保持第一次出現這個標題。 然后,您可以使用幾個標准函數來實現此目的:
// Reverse array, so the first occurrence kept.
$data = array_reverse($data);
$result = array_reverse( // Reverse array to the initial order.
array_values( // Get rid of string keys (make array indexed again).
array_combine( // Create array taking keys from column and values from the base array.
array_column($data, 'list_title'),
$data
)
)
);
這是工作演示 。
更新:
基於@mickmackusa評論,代碼可以簡化為:
$result = array_reverse(array_values(array_column(
array_reverse($data),
null,
'list_title'
)));
有關column_key
參數規范的文檔中column_key
進行了描述:
返回完整的數組或對象也可能為NULL(這與index_key一起用於重新索引數組)。
試試這個
<?php
function super_unique($array)
{
$result = array_map("unserialize", array_unique(array_map("serialize", $array)));
foreach ($result as $key => $value)
{
if ( is_array($value) )
{
$result[$key] = super_unique($value);
}
}
return $result;
}
?>
謝謝大家,有時過度思考會影響常識。
我只是用MYSQL查詢解決了它:
GROUP BY list_title ORDER BY list_date
只需循環遍歷數組並跟蹤重復的字段條目。
對於重復數組,只考慮list_id
和list_title
,但可以添加額外的字段。 所有其他鍵都被忽略。
<?php
$array = [
[
"list_id" => 86,
"list_reference" => 130948,
"list_title" => "Offer: apartment 2+kk",
"list_city" => "Prague",
"list_date" => "2017-03-03 11:20:35",
"list_status" => 0,
"list_creator" => "Company A",
"list_price" => 30000,
"list_furniture" => '""1","0","0""',
"list_accommodation" => "flat"
],
[
"list_id" => 87,
"list_reference" => 130947,
"list_title" => "Offer: apartment 2+kk",
"list_date" => "2017-03-03 11:20:35",
"list_status" => 0,
"list_creator" => "Company B",
"list_price" => 30000,
"list_furniture" => '""1","0","0""',
"list_accommodation" => "flat"
]
];
$duplicateFields = ["list_id" => array(), "list_title" => array()];
foreach ($array as $index => $value) {
if(in_array($value['list_id'], $duplicateFields['list_id']) || in_array($value['list_title'], $duplicateFields['list_title'])){
unset($array[$index]);
}else{
array_push($duplicateFields['list_id'], $value['list_id']);
array_push($duplicateFields['list_title'], $value['list_title']);
}
}
var_dump($array);
產量:
array(1) {
[0]=>
array(10) {
["list_id"]=>
int(86)
["list_reference"]=>
int(130948)
["list_title"]=>
string(22) "Offer: apartment 2+kk"
["list_city"]=>
string(6) "Prague"
["list_date"]=>
string(19) "2017-03-03 11:20:35"
["list_status"]=>
int(0)
["list_creator"]=>
string(9) "Company A"
["list_price"]=>
int(30000)
["list_furniture"]=>
string(13) """1","0","0"""
["list_accommodation"]=>
string(4) "flat"
}
}
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