Description:
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This is a feature request:

A new string separator character ie:#, with variable parsing

To write string contains double-quotes and variables have 4 different solution:
$s = "<p class=\"$class\" id=\"$id\">";
$s = '<p class="'.$class.'" id="'.$id.'">';
$s = <<<HEREDOC
<p class="$class" id="$id"
HEREDOC;
$s = sprintf('<p class="%s" id="%s">', $class, $id);

would suggest a 5th solution:
$s = #<p class="$class" id="$id"#;

Think it would produce cleaner, readable code when write html strings.

The # character used only for example, any may find a better one.