(PHP 4 >= 4.0.4, PHP 5, PHP 7)
gmp_add — Add numbers
a
The first summand (augent).
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b
The second summand (addend).
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A GMP number representing the sum of the arguments.
Example #1 gmp_add() example
<?php
$sum = gmp_add("123456789012345", "76543210987655");
echo gmp_strval($sum) . "\n";
?>
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200000000000000