有关php变量赋值的信息

Question

Can you help me? Is there someone can explain the meaning of this line of php code?

$options = ($options ?: array()) + $this->options;

Thanks

Answer 1

That is equivalent to this:

if (!$options)
  $options = array();

$options = $options + $this->options;

the ?: is the ternary operator. If $options evaluates to true it is returned, otherwise an empty array is returned.

The +operator given two arrays creates a new array by concatenating them