(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_abs — Absolute value
Returns the absolute value of a, as a GMP number.
Example #1 gmp_abs() example
<?php
$abs1 = gmp_abs("274982683358");
$abs2 = gmp_abs("-274982683358");
echo gmp_strval($abs1) . "\n";
echo gmp_strval($abs2) . "\n";
?>
以上例程会输出：
274982683358 274982683358