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run code in 200+ php & hhvm versions
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<?php var_dump(is_numeric("1e3d5")); var_dump("1e3d5"); var_dump("1e3d5" + 1);
based on vuAWd
Output for 7.1.0 - 7.2.0
bool(false) string(5) "1e3d5" Notice: A non well formed numeric value encountered in /in/9Nijj on line 5 float(1001)
Output for 4.3.0 - 7.0.20
bool(false) string(5) "1e3d5" float(1001)