What is the null coalescing operator in PHP7?

PHP: What is the null coalescing operator in PHP7?

The null coalescing operator is two question marks: ??. It is used to replace some ternary operations. Here is an example:

  1. // old way
  2. $var = isset($_GET['variable']) ? $_GET['variable'] : "default_val";
  3.  
  4. // new way - null coalescing:
  5. $var = $_GET["variable"] ?? "default_val";

Both of the above lines do the same thing: they set $var to $_GET['variable'] if it is set (if it passes isset()), but if not then it sets $var to 'default_val'.

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