I didn't found a statement about the compatibility between strings and null in the docs, but trying this on PHP 5.5:
echo 'foo' . null . 'bar';
prints out foobar.
I wonder if this behaviour is guaranteed, or "safe" to do (in SQL, for example, it is not)? Or asking the other way: Would I ever need to check for null before concatenating strings? Like
echo 'foo' . (($mystring === null) ? '' : $mystring) . 'bar';
From the documentation:
NULL is always converted to an empty string.
Yes, you can rely on that behavior.
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