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<?php var_dump(unpack('H*', pack('H*', 9223372036854775807)));
Output for 5.1.3 - 7.1.0
array(1) { [1]=> string(20) "92233720368547758070" }
Output for 5.1.2
array(1) { [1]=> string(21) "922337203685477580700" }
Output for 4.3.5 - 4.3.9, 4.3.11 - 4.4.1, 4.4.3 - 5.0.2, 5.0.5 - 5.1.1
array(1) { [1]=> string(2) "90" }
Output for 4.3.10, 5.0.3 - 5.0.4
Warning: unpack(): Type H: outside of string in /in/pjpeW on line 2 array(1) { [1]=> string(2) "90" }
Output for 4.4.2
array(1) { [1]=> string(3) "900" }
Output for 4.3.0 - 4.3.4
array(1) { [""]=> string(2) "90" }