如果是，則為檢查PHP的真實條件

Question

我想要一個簡單的只是檢查JSON文件包含beganing 最新的比它應該做的一些功能，如果JSON文件包含了比它應該做一些其他的功能beganing 視頻 。 這是我的PHP代碼-

$url = 'http://www.hello.se/3209406a5d0f95&limit=15';
$json = json_decode(file_get_contents($url), true);

if($json['latest']['videos']){ // how can i just put a condition where if it is true than 
//do some function or if it is not true go to the next condition which is else if($json['videos']){ ...

        // do some functions
       }
else if($json['videos']){
// do some functions

我也曾嘗試過----

$url = 'http://www.hello.se/3209406a5d0f95&limit=15';
$json = json_decode(file_get_contents($url), true);

if($json['latest']['videos'] === true){

        // do some functions
       }
else if($json['videos'] === true){
// do some functions

這對我不起作用，任何人都可以幫助我解決此問題。 任何建議將不勝感激，謝謝。

Answer 1

使用isset() ： http : //php.net/manual/en/function.isset.php

if(isset($json['latest']['videos'])){ // how can i just put a condition where if it is true than 
//do some function or if it is not true go to the next condition which is else if($json['videos']){ ...

        // do some functions
       }
else if(isset($json['videos'])){
// do some functions