is_null function is not working in object values - php

Question

I would like to loop through an object like this
0 =>
object(stdClass)[13]
public 'first_name' => string 'toto' (length=7)
public 'last_name' => string 'titi' (length=7)
public 'phone_1' => null
1 =>
object(stdClass)[14]
public 'first_name' => string 'tutu' (length=7)
public 'last_name' => string 'tata' (length=8)
public 'phone_1' => string '123' (length=9)
This object come from a PDO::FetchAll(PDO::fetchobject).
My foreach loop:
foreach($users as $user){
echo (!is_null($user->phone)) ? $user->phone : '';
}
But I got this error message: trying to get property 'phone_1' of non-object in
May someone help me for this ?
Thank you

Answer 1

This:
echo (!is_null($user->phone)) ? $user->phone : '';
... can be simplified to:
echo $user->phone;
If the property is null, it'll cast automatically to empty string ('').
If you get trying to get property 'phone' of non-object1 it's because you don't have an object to begin with. That's a different problem.
If you're looping the results of a database query, you shouldn't need to check for object existence, and doing so might mask a bug in some other part of your code. A possible cause is that your query is failing and fetchAll() returns false.
1 Please note I've fixed the property name in the error message, assuming it was a copy+paste error. If you really read phone and get an error about phone_1, you didn't check the correct line.

Answer 2

I found a solution:
<?php echo isset($user->phone) ? $user->phone : ''; ?>