PHP 5.3.10 vs PHP 5.5.3 syntax error unexpected '['

Question

Is it possible that this PHP code line

if ($this->greatestId()[\"num_rows\"] > 0)

works in PHP 5.5 and returns an error in 5.3??

Answer 1

Array dereferencing became available in PHP 5.4 That's why this doesn't work in PHP 5.3. So you have an extra step where you need to get the array value from your function call and then you can use it:

$variable = $this->greatestId();
if ($variable["num_rows"] > 0){
      // do stuff
}