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<?php $gmp = gmp_add(0, 0); var_dump($gmp); $gmpWas = $gmp; $gmp2 = $gmp + 1; var_dump($gmp2); $gmp++; var_dump($gmp); var_dump($gmp === $gmpWas);
Output for git.master, git.master_jit, rfc.property-hooks
object(GMP)#1 (1) { ["num"]=> string(1) "0" } object(GMP)#2 (1) { ["num"]=> string(1) "1" } object(GMP)#3 (1) { ["num"]=> string(1) "1" } bool(false)

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