Description:
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A conditional concatenator would evaluate a boolean test, then concatenate a value onto the left operand. This operator would simplify scripts by eliminating a kludge. The motive behind this request is to readily construct SQL queries via PHP which can be easily reread and understood with minimal confusion by a follow-on person maintaining the script(s).

Reproduce code:
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// kludge
$sz_string = 'foo';
if ($bool_test) { $sz_string .= 'bar'; }
else { $sz_string .= 'baz'; }
echo $sz_string

// conditional concatenator
$sz_string = 'foo';
$sz_string .? ($bool_test) 'bar' : 'baz';
echo $sz_string

Expected result:
----------------
foobar

Actual result:
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foobar