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<?php var_dump(is_numeric('')); var_dump(is_numeric('test')); var_dump(is_numeric(',0')); var_dump(is_numeric('1,2')); var_dump(is_numeric(' 3'));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
bool(false) bool(false) bool(false) bool(false) bool(true)