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<?php $a = '12345'; // This works: echo "qwe{$a}rty"; // qwe12345rty, using braces echo "qwe" . $a . "rty"; // qwe12345rty, concatenation used // Does not work: echo 'qwe{$a}rty'; // qwe{$a}rty, single quotes are not parsed echo "qwe$arty"; // qwe, because $a became $arty, which is undefined ?>