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<?php var_dump(is_numeric(' 1')); var_dump(is_numeric('0x1')); var_dump(is_numeric(' 0x1')); ?>
based on CfATF
Output for 7.0.0 - 7.2.0
bool(true) bool(false) bool(false)
Output for 4.3.0 - 4.3.9, 5.0.0 - 5.0.2, 5.2.1 - 5.6.28
bool(true) bool(true) bool(true)
Output for 4.3.10 - 4.4.9, 5.0.3 - 5.2.0
bool(true) bool(true) bool(false)