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<?php var_dump(unpack('H*', pack('C*', 9223372036854775807)));
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, 5.1.3 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(1) { [1]=> string(2) "ff" }
Output for 4.4.2, 5.1.2
array(1) { [1]=> string(3) "ff0" }
Output for 5.0.3 - 5.0.4
<br /> <b>Warning</b>: unpack() [<a href='function.unpack'>function.unpack</a>]: Type H: outside of string in <b>/in/I2lF4</b> on line <b>2</b><br /> array(1) { [1]=> string(2) "ff" }
Output for 4.3.10
<br /> <b>Warning</b>: unpack(): Type H: outside of string in <b>/in/I2lF4</b> on line <b>2</b><br /> array(1) { [1]=> string(2) "ff" }
Output for 4.3.0 - 4.3.4
array(1) { [""]=> string(2) "ff" }