string variable in php code example

Example 1: php variable in string

$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

Example 2: PHP Variable in String

phpCopy# php 7.*
<?php
$txt = "salt";
echo "{$txt}y";
?>