1.php in is_numeric (var) this bypass function, passing a number and let him return true. Because php is weakly typed language so, directly followed by the character to bypass the 1234% 00, in other places can still be used as digital.
2.url hex address may be coded transmission values (0x beginning).
ctf analysis
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Origin www.cnblogs.com/PrideAssassin/p/11574136.html
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