php - Cannot use [] for reading

Question

In one of my scripts, I try to do the following

$data[]?= self::get($row['sr_id']); // <-- line 55

However, PHP does not allow me to do this, giving me this error

Fatal error: Cannot use [] for reading in /file.php on line 55

The self::get function return either a bool, or an object.

Edit: The get function creates a new object which again loads data from a mysql database.

Answer 1

The solution in my case was this:

• Bad line:

$this->$ExtraTag[] = $fullscript;

• Good line:

$this->{$ExtraTag}[] = $fullscript;

or

$this->ExtraTag[] = $fullscript;