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<?php var_dump(is_numeric('123')); var_dump(is_numeric(123)); var_dump(is_numeric(true)); var_dump(is_numeric(12.3));
Output for 5.6.30, hhvm-3.15.4 - 3.22.0, 7.0.0 - 7.3.0rc3
bool(true) bool(true) bool(false) bool(true)