Can't access object property by array value

Question

I didnot understand why this is not working in PHP 7.0

$obj = mysqli_fetch_object(...);
if (is_object($obj)) { // OK
 echo $obj->name;
 // writes Hello
 $my_var = "name";
 echo $obj->$my_var; 
 // writes Hello
 $my_arr = array('test' => array('col' => 'name'));
 echo $obj->$my_arr['test']['col']; // <-- this didnot work
 // writes nothing :( 
}

Could I anyway to correct it?

Because -> is executed before [...].

Siguza
– Siguza

2017-05-22 16:33:36 +00:00
Commented May 22, 2017 at 16:33 — Siguza
– Siguza, Commented May 22, 2017 at 16:33
How could I correct it?

user5332
– user5332

2017-05-22 16:34:06 +00:00
Commented May 22, 2017 at 16:34 — user5332
– user5332, Commented May 22, 2017 at 16:34

Siguza · Accepted Answer · 2017-05-22 16:36:48Z

1

-> is executed before [], so your code is equivalent to:

echo ($obj->$my_arr)['test']['col'];

You can change that with {}:

echo $obj->{$my_arr['test']['col']};

answered May 22, 2017 at 16:36

Siguza

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