php 仅从此数组中选择唯一的数组值
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Select only unique array values from this array
提问by RhymeGuy
I have the following variable $rows:
我有以下变量 $rows:
Array (
[0] => stdClass Object ( [product_sku] => PCH20 ) [1] => stdClass Object ( [product_sku] => PCH20 ) [2] => stdClass Object ( [product_sku] => PCH19 ) [3] => stdClass Object ( [product_sku] => PCH19 ))
大批 (
[0] => stdClass Object ( [product_sku] => PCH20 ) [1] => stdClass Object ( [product_sku] => PCH20 ) [2] => stdClass Object ( [product_sku] => PCH19 ) [3] => stdClass Object ( [product_sku] => PCH19 ))
I need to create second array $second containing only unique values:
我需要创建仅包含唯一值的第二个数组 $second :
Array (
[0] => stdClass Object ( [product_sku] => PCH20 ) [1] => stdClass Object ( [product_sku] => PCH19 ))
大批 (
[0] => stdClass Object ( [product_sku] => PCH20 ) [1] => stdClass Object ( [product_sku] => PCH19 ))
But when i run array_unique on $rows, i receive:
但是当我在 $rows 上运行 array_unique 时,我收到:
Catchable fatal error: Object of class stdClass could not be converted to string on line 191
可捕获的致命错误:无法在第191行将类 stdClass 的对象转换为字符串
采纳答案by deceze
$uniques = array();
foreach ($array as $obj) {
$uniques[$obj->product_sku] = $obj;
}
var_dump($uniques);
回答by KingCrunch
The optional second parameter sort_flags may be used to modify the sorting behavior using these values:
Sorting type flags:
- SORT_REGULAR - compare items normally (don't change types)
- SORT_NUMERIC - compare items numerically
- SORT_STRING - compare items as strings
- SORT_LOCALE_STRING - compare items as strings, based on the current locale.
可选的第二个参数 sort_flags 可用于使用以下值修改排序行为:
排序类型标志:
- SORT_REGULAR - 正常比较项目(不要改变类型)
- SORT_NUMERIC - 以数字方式比较项目
- SORT_STRING - 将项目作为字符串进行比较
- SORT_LOCALE_STRING - 根据当前语言环境将项目作为字符串进行比较。
Also note the changenotes below
另请注意下面的更改说明
5.2.10Changed the default value of sort_flags back to SORT_STRING.
5.2.9Added the optional sort_flags defaulting to SORT_REGULAR. Prior to 5.2.9, this function used to sort the array with SORT_STRING internally.
5.2.10将 sort_flags 的默认值改回 SORT_STRING。
5.2.9添加了可选的 sort_flags,默认为 SORT_REGULAR。在 5.2.9 之前,该函数用于在内部使用 SORT_STRING 对数组进行排序。
$values = array_unique($values, SORT_REGULAR);
回答by Stegrex
The default behavior of function array_unique()is to treat the values inside as strings first. So what's happening is that PHP is attempting to turn your objects into strings (which is throwing the error).
函数的默认行为array_unique()是首先将内部的值视为字符串。所以发生的事情是 PHP 试图将您的对象转换为字符串(这会引发错误)。
You can modify your function call like this:
您可以像这样修改您的函数调用:
$uniqueArray = array_unique($rows, SORT_REGULAR);
This will compare values without changing their data type.
这将比较值而不更改它们的数据类型。
回答by Raju Dudhrejiya
Please check below code, I hope this will be helpful to you.
请检查下面的代码,我希望这会对您有所帮助。
$resultArray = uniqueAssocArray($actualArray, 'product_sku');
function uniqueAssocArray($array, $uniqueKey)
{
if (!is_array($array))
{
return array();
}
$uniqueKeys = array();
foreach ($array as $key => $item)
{
$groupBy=$item[$uniqueKey];
if (isset( $uniqueKeys[$groupBy]))
{
//compare $item with $uniqueKeys[$groupBy] and decide if you
//want to use the new item
$replace= false;
}
else
{
$replace=true;
}
if ($replace)
$uniqueKeys[$groupBy] = $item;
}
return $uniqueKeys;
}

