Laravel 检查属性存在
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Laravel check property exist
提问by Igor Ostapiuk
How I can check existing property $this->team->playerAssignment->playerin more rational way? Now I check it like this:
我如何$this->team->playerAssignment->player以更合理的方式检查现有财产？现在我像这样检查它：
if ($this->team)
if (($this->team->playerAssignment))
if (($this->team->playerAssignment->player))
回答by Nurlan Nuriyev
Try isset php function.
试试isset php函数。
isset — Determine if a variable is set and is not NULL
isset — 确定变量是否已设置且不为 NULL
if(isset($this->team->playerAssignment->player)){
}
回答by Meloman
The best way is
最好的办法是
if (
isset($this->team)
&& isset($this->team->playerAssignment)
&& isset($this->team->playerAssignment->player)
){
// your code here...
}
Because PHP will stops if the first is to false, if first object exists, it continue to second, and third condition...
Why not use only && $this->team->playerAssignment->player?! because if player has 0for value it will be understood as a falsebut variable exists !
因为如果第一个是false，PHP 会停止，如果第一个对象存在，它会继续第二个，第三个条件......为什么不只使用&& $this->team->playerAssignment->player？！因为如果玩家0有价值，它将被理解为一个false但变量存在！
