Description:
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There is a need for another operator, which would reduce the code dramatically. 
Be sure there are situations when stupid testing for validity get load of code, 
so i suggest modify ternary operator ( expression ? true : false ) to next 
variant:

$foo = "hello";
$bar = "world";

$output = $foo ? $bar;

$output is "hello";

$foo = null (0, false, etc);
$bar = "world";

$output is "world";

Test script:
---------------
$foo = false;
$bar = "foo";

echo $foo ? "bar";
echo $bar ? "bar";

Expected result:
----------------
bar
foo