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<?php $id = '14910855968770314426'; $guid = base_convert($id, 10, 16); $guid2 = gmp_strval(gmp_init($id, 10), 16); var_dump($guid); var_dump($guid2);
Output for git.master, git.master_jit, rfc.property-hooks
string(16) "ceee0080a3915000" string(16) "ceee0080a39150ba"

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