从 PHP 中的 foreach 循环返回不同的值？
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Returning distinct values from foreach loop in PHP?
提问by hairynuggets
I have a foreach loop which echo's each of the property types in my search results. The code is as follows:
我有一个 foreach 循环，它echo是我搜索结果中的每个属性类型。代码如下：
<?php
foreach($search_results as $filter_result) {
echo $filter_result['property_type'];
}
?>
The above code returns:
上面的代码返回：
house house house house flat flat flat
I would like to do something similar to the MySQL 'distinct', but I am not sure how to do it on a foreach statement.
我想做一些类似于 MySQL 'distinct' 的事情，但我不知道如何在 foreach 语句中做到这一点。
I want the above code to return:
我希望上面的代码返回：
- house
- flat
- 房子
- 平坦的
Not repeat every item each time. How can I do this?
不要每次都重复每个项目。我怎样才能做到这一点？
回答by hsz
Try with:
尝试：
$property_types = array();
foreach($search_results_unique as $filter_result){
if ( in_array($filter_result['property_type'], $property_types) ) {
continue;
}
$property_types[] = $filter_result['property_type'];
echo $filter_result['property_type'];
}
回答by ale
http://php.net/manual/en/function.array-unique.php
http://php.net/manual/en/function.array-unique.php
Example:
例子：
$input = array("a" => "green", "red", "b" => "green", "blue", "red");
$result = array_unique($input);
print_r($result);
Array
(
[a] => green
[0] => red
[1] => blue
)
You will need to alter it slightly to check using the property_typepart of your array.
您需要稍微更改它以使用property_type数组的一部分进行检查。
回答by Widor
I'd use two loops here. One to build an array of distinct property_typefields (you can use code in the loop to check the item doesn't already exist).
我会在这里使用两个循环。一个构建不同property_type字段的数组（您可以在循环中使用代码来检查项目不存在）。
Then, use a second loop to step through the array and echothe list of items.
然后，使用第二个循环遍历数组和echo项目列表。
回答by inquam
You would have to keep track of already echoed values or build a new unique array of the values of all the $filter_result['property_type']. But that would then require you to iterate over that array once more to actually print. So keeping track would be better.
您必须跟踪已经回显的值或构建所有$filter_result['property_type']值的新唯一数组。但这将要求您再次迭代该数组以实际打印。所以跟踪会更好。
回答by nax
I was thinking there was some parameter to the in_array() function to get the count of the items found.
我在想 in_array() 函数有一些参数来获取找到的项目数。
But is doesn't exist.
但是是不存在的。
So try with array_unique().
所以尝试使用array_unique()。
The better way is to duplicate the array before the foreachloop and apply this function.
更好的方法是在foreach循环之前复制数组并应用此函数。
回答by Eugen Rieck
<?php
$filter=array();
foreach($search_results as $filter_result)
$filter[]=$filter_result['property_type'];
$filter=array_unique($filter);
print_r($filter);
?>
