Description:
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From manual page: http://php.net/manual/ru/function.gmp-add.php
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In the russian translation of the page describing the function gmp_add the name of parameter "a" is incorrect. Instead of "Второе слагаемое" (eng.: second term) it should be "Первое слагаемое" (eng.: the first term).

Also in the original english version of this page (http://www.php.net/function.gmp-add) parameters "a" and "b" are called the same "A number that will be added".