Intégrate GMP in PHP

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PHP - GNU Multiple Precision
if php is build with gmp staticaly, allow this syntaxe :

function F($x):float {
	return $( $x**2 - $x - 1 );
}
function f($x):float {
	return $( 2*$x - 1 );
}
echo $( 1 / 3 + 1 / 3);// "2/3"

if (8.0 !== $( (0.1+0.7)*10) ) {
	echo "8.0 !== '8.0'\n";
}
if (8 == $( (0.1+0.7)*10) ) {
	echo "8 == '8.0000000000000'\n";
}