Francisco A.M.
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Null coalescing $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. Introduced in PHP 7 https://www.w3schools.com/php/php_operators.asp En el ejemplo try it>>> No funciona la variable $_GET['user'] con el ejemplo, un saludo.