3v4l.org

run code in 300+ PHP versions simultaneously
<?php var_dump(bin2hex(pack('E', 1e13))); var_dump(unpack('E', hex2bin('2800322f96213747')));
Output for 8.1.0 - 8.1.29, 8.2.0 - 8.2.21, 8.3.0 - 8.3.9
string(16) "42a2309ce5400000" array(1) { [1]=> float(5.138075498868372E-116) }
preferences:
86.41 ms | 403 KiB | 67 Q