ternary.php

<?php

// Returns the value of the expression, take care if you use isset or some function who evaluate the variable
// because will return true or the response of the function.

$x = "Hey";
echo $x ?: "The variable doesn't exist";

echo (isset($y) ?: "The variable doesn't exist");

$z = "This will return TRUE instead of this sentence";
echo (isset($z) ?: "The variable doesn't exist");