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phpoperatorsphp-7

Is this '??' is a operator in php or what it's called? Also is it used for empty() or isset() check?

$name = $username ?? '';

I don't know actually what is this ?? called?

Solution

  • ?? is Null coalescing Let suppose

    $x = expr1 ?? expr2

    Returns the value of $x.The value of $x is expr1 if expr1 exists, and is not NULL. If expr1 does not exist, or is NULL, the value of $x is expr2.Null coalescing Introduced in PHP 7.

    Other Examples

    <?php
   // variable $user is the value of $_GET['user']
   // and 'anonymous' if it does not exist
   echo $user = $_GET["user"] ?? "anonymous";
   echo("<br>");
  
   // variable $color is "red" if $color does not exist or is null
   echo $color = $color ?? "red";
?>