how to validate a json empty object in php

Question

my php code works fine when it returns the result like this ->

{
"id": 267935,
"results": [
{
"key": "rc94yWXcyr0",
"name": "Trailer 1",
"site": "YouTube"
},
{  
"key": "GZ0Bey4YUGI",
"name": "Official Trailer",
"site": "YouTube"
},
{
"key": "y1fZg0hhBX8",
"name": "Official Trailer 2",
"site": "YouTube"
}
]
}

but i get error

(Notice: Undefined variable: finaltrailers in ... )

when results return like this -->

{
"id": 392344,
"results": [

]
}

and this is my php code -->

  $trailer = $json2['results'];
    foreach($trailer as $trailers=>$keytrailers){
                       foreach($keytrailers as $alltrailers=>$allkeytrailers){
                           if($alltrailers == 'key'){
                           @ $finaltrailers .=  $allkeytrailers.',';
                           }
                       }
                   }
echo trim($finaltrailers,",");

how can i validate the empty array and give and error my self ? please help me thank you.

legionth · Accepted Answer · 2016-08-04 12:21:56Z

1

You have to define the variable to use it in trim. Just add it at the beginning of your code.

$finaltrailers = '';
$trailer = $json2['results'];

foreach($trailer as $trailers=>$keytrailers){
    foreach($keytrailers as $alltrailers=>$allkeytrailers){
        if($alltrailers == 'key'){
             @ $finaltrailers .=  $allkeytrailers.',';
        }
     }
}
echo trim($finaltrailers,",");

answered Aug 4, 2016 at 12:21

legionth

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