3v4l.org

run code in 150+ php & hhvm versions
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<?php var_dump(hexdec('755869c2d8ad8a0')); var_dump(hexdec('755869c2d8ad8a0a15e4337804c3dec6'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
int(528476536622995616) float(1.5597874272072E+38)