PHP Filter function validation, filtering user input data _php skills

Introduction to PHP Filter

The PHP filter is used to validate and filter data from unsecured sources, such as user input.

Copy Code code as follows:

Remove HTML tags, or remove coded special characters
Var_dump (Filter_var ("
url_encoded encoding, removing or encoding special characters
Var_dump (Filter_var ("http://Chinese ah", filter_sanitize_encoded));

HTML escape character "" <>& and ASCII value less than 32 characters.
Var_dump (Filter_var ("<a&b#\" > ", Filter_sanitize_special_chars)");

Remove all characters except letters, numbers, and!#$%& ' *+-/=?^_ ' {|} ~@. []
Var_dump (Filter_var ("as$&><", Filter_sanitize_email));

Delete all characters except letters, numbers, and $-_.+!* ' (), {}|\\^~[] ' <>#% ';/?:@&=
Var_dump (Filter_var ("k<>! ", Filter_sanitize_url));

Remove all characters except numbers and +-
Var_dump (Filter_var ("123abc++", Filter_sanitize_number_int));

Remove all characters except numbers, +-, and., EE.
Var_dump (Filter_var ("mm.,pp", filter_sanitize_number_float));

Application Addslashes
Var_dump (Filter_var ("aa//", filter_sanitize_magic_quotes));

Validates values with integers in the specified range
Var_dump (Filter_var (20,filter_validate_int,array ("Options" =>array ("Min_range" =>10, "Max_range" =>51))) ;

Returns True if "1", "true", "on", and "Yes", and False if "0", "false", "off", "No", and "". Otherwise NULL is returned.
Var_dump (Filter_var (1,filter_validate_boolean));

Validates values with floating-point numbers.
Var_dump (Filter_var (222,filter_validate_float));

Verifying URLs
Var_dump (Filter_var ("http://www.baidu.com", Filter_validate_url));

Verify Email
Var_dump (Filter_var ("abcd@123.com", Filter_validate_email));

Verifying IP addresses
Var_dump (Filter_var ("1.1.1.266", filter_validate_ip));