Here is one way to do it, but not more efficient. Also you can use substr.

$string = "bcde" ;
$string = "a$string";
print $string;

To add at the end,

$string = "abcd" ;
$string = "${string}e" ;
print $string;
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update:As roboticus suggested, unless you tell whether you need effieciency interms of smaller or execution speed or more maintainable, it ll be difficult to suggest correct method. roboticus++ :)

Prasad

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