Filter function in php to verify and filter user-entered data_PHP tutorial

Introduction to PHP Filter

PHP filters are used to validate and filter data from non-secure sources (such as user input).

Copy code The code is as follows:

//Remove html tags, or remove encoded special characters
var_dump(filter_var( "中文ABC@#<script>abc</script>BBB",FILTER_SANITIZE_STRING));

// url_encoded encoding, remove or encode special characters
var_dump(filter_var("http://中文",FILTER_SANITIZE_ENCODED));

//html escape characters ""<>& and ASCII value Less than 32 characters.
var_dump(filter_var("",FILTER_SANITIZE_SPECIAL_CHARS));

//Delete 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)) ;

//Delete all characters, except numbers and +-
var_dump(filter_var("123ABC++",FILTER_SANITIZE_NUMBER_INT));

//Delete all characters, except numbers, + - and.,eE.
var_dump(filter_var("mm.,pp",FILTER_SANITIZE_NUMBER_FLOAT));

//Apply addslashes
var_dump(filter_var("aa//''",FILTER_SANITIZE_MAGIC_QUOTES));

//Verify the value as an integer in the specified range
var_dump(filter_var(20,FILTER_VALIDATE_INT,array("options"=>array("min_range"=>10,"max_range"=>51) )));

//If it is "1", "true", "on" and "yes", return true, if it is "0", "false", "off", "no " and "", returns false. Otherwise NULL is returned.
var_dump(filter_var(1,FILTER_VALIDATE_BOOLEAN));

//Verify the value as a floating point number.
var_dump(filter_var(222,FILTER_VALIDATE_FLOAT));

//Verification URL
var_dump(filter_var("http://www.baidu.com",FILTER_VALIDATE_URL));

//Verify email
var_dump(filter_var("abcd@123.com",FILTER_VALIDATE_EMAIL));

//Verify IP address
var_dump(filter_var("1.1.1.266",FILTER_VALIDATE_IP ));

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