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<?php
$a = 'AAAA';
$b = 'BBBB{$a}';
$c = "$b";
echo $c;
$a = 'AAAA';
$b = 'BBBB{$a}';
$a = 'AAAA';
$b = 'BBBB{$a}';
$a = 'AAAA';
$b = 'BBBB{$a}';
eval("\$c = \"$b\";");
//or eval('$c = "'.$b.'";');
echo $c;
$a = 'AAAA';
$b = "BBBB{$a}";
$c = "$b";
echo $c;