我有這個數組 Array( [0] => Array ( [user_id] => 78 [post_id] => 3 [post_user_added_id] => 2 ) [1] => Array ( [user_id] => 76 [post_id] => 3 [post_user_added_id] => 16 ) [2] => Array ( [user_id] => 78 [post_id] => 3 [post_user_added_id] => 12 ) [3] => Array ( [user_id] => 76 [post_id] => 9 [post_user_added_id] => 15 ) [4] => Array ( [user_id] => 77 [post_id] => 9 [post_user_added_id] => 15 )我想要做的是如果密鑰post_id重復我只想清空它并保留一個所以我的最終數組將如下所示 Array( [0] => Array ( [user_id] => 78 [post_id] => 3 [post_user_added_id] => 2 ) [1] => Array ( [user_id] => 76 [post_id] => [post_user_added_id] => 16 ) [2] => Array ( [user_id] => 78 [post_id] => [post_user_added_id] => 12 ) [3] => Array ( [user_id] => 76 [post_id] => 9 [post_user_added_id] => 15 ) [4] => Array ( [user_id] => 77 [post_id] => [post_user_added_id] => 15 )我已經嘗試過這段代碼，但它似乎不起作用它刪除了整個數組 foreach($arry as $k => $v) { foreach($arry as $key => $value) { if($k != $key && $v['post_id'] == $value['post_id']) { unset($arry [$k]); } } } print_r($arry);
4 回答
繁星點點滴滴
TA貢獻1803條經驗 獲得超3個贊
您可以foreach與ternary操作員一起執行
$last = null;//this will keep the previous post_id
foreach($arr as &$v){
($last && $last == $v['post_id']) ? ($v['post_id'] = '') : ($last = $v['post_id']);
}
print_r($arr);
工作示例：- https://3v4l.org/RiU9J
開心每一天1111
TA貢獻1836條經驗 獲得超13個贊
使用您的數組值而不是 $arr 并嘗試像以下代碼一樣過濾數組：
$arr = array(
array(
'user_id'=>15,
'post_id'=>3,
'post_user_added_id'=>2
),
array(
'user_id'=>16,
'post_id'=>3,
'post_user_added_id'=>2
),
array(
'user_id'=>18,
'post_id'=>3,
'post_user_added_id'=>2
),
array(
'user_id'=>18,
'post_id'=>3,
'post_user_added_id'=>2
),
array(
'user_id'=>16,
'post_id'=>3,
'post_user_added_id'=>2
),
);
$postids = array();
foreach($arr as $key=>$val){
if(in_array($val['post_id'], $postids)){
$arr[$key]['post_id'] = '';
}else{
$postids[] = $val['post_id'];
}
}
echo "<pre>";print_r($arr);exit;
輸出 ：
Array
(
[0] => Array
(
[user_id] => 15
[post_id] => 3
[post_user_added_id] => 2
)
[1] => Array
(
[user_id] => 16
[post_id] =>
[post_user_added_id] => 2
)
[2] => Array
(
[user_id] => 18
[post_id] =>
[post_user_added_id] => 2
)
[3] => Array
(
[user_id] => 18
[post_id] =>
[post_user_added_id] => 2
)
[4] => Array
(
[user_id] => 16
[post_id] =>
[post_user_added_id] => 2
)
)
子衿沉夜
TA貢獻1828條經驗 獲得超3個贊
嘗試這個 ：
// example code
$arrayResult = array();
$arry = [
1 =>
[
'user_id' => 78,
'post_id' => 3,
'post_user_added_id' => 2
],
2=>
[
'user_id' => 76,
'post_id' => 3,
'post_user_added_id' => 16
],
3 =>
[
'user_id' => 78,
'post_id' => 3,
'post_user_added_id' => 12
],
4 =>
[
'user_id' => 76,
'post_id' => 9,
'post_user_added_id' => 15
],
5 =>
[
'user_id' => 77,
'post_id' => 9,
'post_user_added_id' => 15
]];
$final = array();
foreach($arry as $a)
{
if (in_array($a['post_id'], $arrayResult)) {
$a['post_id'] = 0;
}else{
$arrayResult[] = $a['post_id'];
}
$final[] = $a;
}
var_dump($final);
慕田峪7331174
TA貢獻1828條經驗 獲得超13個贊
在這里試試這個。
$tempArr = [];
$resArr = [];
foreach($orignalArr as $key=>$obj){
if(in_array($obj['post_id'], $tempArr)){
$obj['post_id'] = '';
$resArr[] = $obj;
}else{
$tempArr[] = $obj['post_id'];
$resArr[] = $obj;
}
}
print_r($resArr);
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