Decimal type in php

Does PHP have Decimal(±1.0 × 10−28开发者_开发百科 to ±7.9 × 1028) data type?

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The BC Math extension implements arbitrary-precision decimal math:

$a = '0.1';
$b = '0.2';
echo bcadd($a, $b);     // prints 0.3

(From The Floating-Point Guide)