php stdClass 检查属性是否存在

php stdClass check for property exist

提问by june8

I have read some similar issues here but unfortunately find the solution for my case.

我在这里阅读了一些类似的问题，但不幸的是找到了适合我的案例的解决方案。

Some part of the output for an API connection is as;

API 连接的部分输出如下：

stdClass Object ( [page] => 0 [items] => 5 [total] => 5 [saleItems] => stdClass Object ( [saleItem] => Array ( [0] => stdClass Object ( [reviewState] => approved [trackingDate] => 2013-11-04T09:51:13.420+01:00 [modifiedDate] => 2013-12-03T15:06:39.240+01:00 [clickDate] => 2013-11-04T09:06:19.403+01:00 [adspace] => stdClass Object ( [_] => xxxxx [id] => 1849681 ) [admedium] => stdClass Object ( [_] => Version 3 [id] => 721152 ) [program] => stdClass Object ( [_] => yyyy [id] => 10853 ) [clickId] => 1832355435760747520 [clickInId] => 0 [amount] => 48.31 [commission] => 7.25 [currency] => USD [gpps] => stdClass Object ( [gpp] => Array ( [0] => stdClass Object ( [_] => 7-75 [id] => z0 ) ) ) [trackingCategory] => stdClass Object ( [_] => rers [id] => 68722 ) [id] => 86erereress-a9e4-4226-8417-a46b4c9fd5df )

Some strings do not include gpps property.

某些字符串不包含 gpps 属性。

What I have done is as follows

我所做的如下

foreach($sales->saleItems->saleItem as $sale)
{
    $status     = $sale->reviewState;

    if(property_exists($sale, gpps)) 
    {
        $subId      = $sale->gpps->gpp[0]->_;
    }else{
        $subId      = "0-0";
    }
}

What I want is I the gpps property is not included in that string $subId stored as 0-0 in db, otherwise get the data from the string. But it doesn't get the strings without gpps.

我想要的是 gpps 属性不包含在该字符串 $subId 中，存储为 0-0 在 db 中，否则从字符串中获取数据。但是没有gpps就不会得到字符串。

Where is my mistake?

我的错误在哪里？

回答by Matteo Tassinari

Change

改变

if(property_exists($sale, gpps)) 

with

和

if(property_exists($sale, "gpps"))

notice how now gppsis passed as string, as per the specs of the property_existsfunction:

注意 nowgpps是如何作为字符串传递的，根据property_exists函数的规范：

bool property_exists ( mixed $class , string $property )

This function checks if the given property exists in the specified class.

Note:As opposed with isset(), property_exists()returns TRUEeven if the property has the value NULL.

bool property_exists ( mixed $class , string $property )

此函数检查给定的属性是否存在于指定的类中。

注意：与 相反isset()，即使属性具有值，也会property_exists()返回。TRUENULL

回答by JC.

property_existsis the method designed for this purpose.

property_exists是为此目的而设计的方法。

bool property_exists ( mixed $class , string $property )

This function checks if the given property exists in the specified class.

Note: As opposed with isset(), property_exists() returns TRUE even if the property has the value NULL.

bool property_exists ( mixed $class , string $property )

这个函数检查给定的属性是否存在于指定的类中。

注意：与 isset() 不同，即使属性值为 NULL，property_exists() 也会返回 TRUE。

回答by Qullbrune

Try a simple hack and use count, since the property contains an array, and I guess, that count(array) == 0 is the same case as when the property is not set.

尝试一个简单的 hack 并使用 count，因为该属性包含一个数组，我猜，count(array) == 0 与未设置该属性时的情况相同。

foreach($sales->saleItems->saleItem as $sale)
{
 $status     = $sale->reviewState;

 if(@count($sale->gpps->gpp) && count($sale->gpps->gpp) > 0) 
 {
    $subId      = $sale->gpps->gpp[0]->_;
 }else{
    $subId      = "0-0";
 }
}

Sure, this is not the most beautiful solution, but since the php-function do not work as expected, I thought a bit more pragmatic.

当然，这不是最漂亮的解决方案，但由于 php-function 没有按预期工作，我认为更务实一点。

回答by Isthatso

Another way , get_object_vars

另一种方式，get_object_vars

$obj = new stdClass();
$obj->name = "Nick";
$obj->surname = "Doe";
$obj->age = 20;
$obj->adresse = null;

$ar_properties[]=get_object_vars($obj);

foreach($ar_properties as $ar){
    foreach ($ar as $k=>$v){        
    if($k =="surname"){
        echo "Found";
    }
    }
}