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<?php echo intval('3.581E+8'+0), "\n", intval('3.581E8'+0), "\n", intval('+3.581E8'+0), "\n", intval('-3.581E8'+0), "\n" ; echo intval(0+'3.581E+8'), "\n", intval(0+'3.581E8'), "\n", intval(0+'+3.581E8'), "\n", intval(0+'-3.581E8'), "\n" ; var_dump(0+'3.581E+8');
Output for 5.2.7 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.35, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 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, 8.3.0 - 8.3.6
358100000 358100000 358100000 -358100000 358100000 358100000 358100000 -358100000 float(358100000)
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.6
358100000 358100000 358100000 -358100000 358100000 358100000 358100000 -358100000 float(3.581E+8)

preferences:
266.63 ms | 402 KiB | 389 Q