PHP Foreach 数组和对象
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PHP Foreach Arrays and objects
提问by AttikAttak
I have an array of objects.
A print_routput looks like this:
我有一个对象数组。一个print_r输出如下：
Array
(
[0] => stdClass Object
(
[sm_id] => 1
[c_id] => 1
)
[1] => stdClass Object
(
[sm_id] => 1
[c_id] => 2
)
)
I am really struggling to find a way to loop though the results and access the object elements. If anyone could give me any pointers i would be extremely grateful.
我真的很难找到一种方法来循环遍历结果并访问对象元素。如果有人能给我任何指示，我将不胜感激。
Thanks in advance
提前致谢
回答by GBD
Use
用
//$arr should be array as you mentioned as below
foreach($arr as $key=>$value){
echo $value->sm_id;
}
OR
或者
//$arr should be array as you mentioned as below
foreach($arr as $value){
echo $value->sm_id;
}
回答by Sampson
Looping over arrays and objects is a pretty common task, and it's good that you're wanting to learn how to do it. Generally speaking you can do a foreachloopwhich cycles over each member, assigning it a new temporary name, and then lets you handle that particular member via that name:
循环遍历数组和对象是一项非常常见的任务，如果您想学习如何执行此操作是件好事。一般来说，你可以做一个foreach循环，其循环在每个成员，分配给它一个新的临时名称，然后让你通过这个名字办理特定成员：
foreach ($arr as $item) {
echo $item->sm_id;
}
In this example each of our values in the $arrwill be accessed in order as $item. So we can print our values directly off of that. We could also include the index if we wanted:
在这个例子中，我们在 中的每个值都$arr将按顺序访问为$item。所以我们可以直接打印出我们的值。如果需要，我们还可以包含索引：
foreach ($arr as $index => $item) {
echo "Item at index {$index} has sm_id value {$item->sm_id}";
}
回答by Ronny Sherer
Recursive traverse object or array with array or objects elements:
递归遍历具有数组或对象元素的对象或数组：
function traverse(&$objOrArray)
{
foreach ($objOrArray as $key => &$value)
{
if (is_array($value) || is_object($value))
{
traverse($value);
}
else
{
// DO SOMETHING
}
}
}
回答by imkingdavid
Assuming your sm_idand c_idproperties are public, you can access them by using a foreachon the array:
假设您的sm_id和c_id属性是公开的，您可以通过foreach在数组上使用 a 来访问它们：
$array = array(/* objects in an array here */);
foreach ($array as $obj) {
echo $obj->sm_id . '<br />' . $obj->c_id . '<br />';
}
