Online PHP editor | output for uRM2P

Output for 8.3.0 - 8.3.6: Warning: unpack(): Type N: not enough input values, need 4 values but only 1 was provided in /in/uRM2P on line 4 bool(false)
Output for 5.2.3 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18: Warning: unpack(): Type N: not enough input, need 4, have 1 in /in/uRM2P on line 4 bool(false)
Output for 4.4.3 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.2: Warning: unpack() [<a href='function.unpack'>function.unpack</a>]: Type N: not enough input, need 4, have 1 in /in/uRM2P on line 4 bool(false)
Output for 4.3.2 - 4.3.11, 4.4.0 - 4.4.2: Warning: unpack(): Type N: not enough input, need 4, have 1 in /in/uRM2P on line 4 bool(false)
Output for 4.3.0 - 4.3.1: Warning: unpack() [<a href='http://www.php.net/function.unpack'>function.unpack</a>]: Type N: not enough input, need 4, have 1 in /in/uRM2P on line 4 bool(false)