Based on$_ The verification code of session variable is used for ddos attack defense (php Implementation)
1, Basic knowledge
1.strpos() function
① Usage: The strpos() function looks for the first occurrence of a string in another string. It is case sensitive and binary safe. ② Parameters: strpos(string,find,start) String is required. Specifies the string to search. Find is required. Specifies the string to find. Start is optional. Specify w ...
Added by mbowling on Thu, 23 Dec 2021 23:07:06 +0200