Percent from decimal? PHP

Question

Trying to convert this \"0.274509817\" to a nice precentage like 27%

The string is a dynamic value from an API.

Answer 1

What's the problem with intval($a * 100) . '%'?

Answer 2

$number = 0.274509817;
echo round( $number * 100 ), '%';

Answer 3

round((float)$value * 100) . '%'

Answer 4

and after that, append

"%" 

to get the percent sign (e.g. if used with sprintf).

Answer 5

$percent = round((float)$str * 100 ) . '%';

Where $str = "0.274509817"