PHP's own filter filtering function

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

Filter_has_var () checks to see if a variable of the specified input type exists.

FILTER_ID () returns the ID number of the specified filter.

Filter_input () gets input from outside the script and filters it.

Filter_input_array () gets multiple inputs from outside the script and filters them.

Filter_list () returns an array that contains all the supported filters.

Filter_var_array () Gets the multiple variables and filters them.

Filter_var () Gets a variable and filters it.

PHP Filters

ID name	Description
Filter_callback	Invokes a user-defined function to filter the data.
Filter_sanitize_string	Remove tags, remove or encode special characters.
filter_sanitize_stripped	The alias of the "string" filter.
filter_sanitize_encoded	Url-encode string that removes or encodes special characters.
Filter_sanitize_special_chars	The HTML escape character ' "<>& and the ASCII value less than 32 characters.
Filter_sanitize_email	Remove all characters except letters, numbers, and!#$%& ' *+-/=?^_ ' {|} [Email protected] []
Filter_sanitize_url	Delete all characters except letters, numbers, and $-_.+!* ' (), {}|\\^~[] ' <>#% ';/?:@&=
Filter_sanitize_number_int	Remove all characters except numbers and +-
Filter_sanitize_number_float	Remove all characters except numbers, +-and., EE.
Filter_sanitize_magic_quotes	Apply Addslashes ().
Filter_unsafe_raw	Do not filter, remove or encode special characters.
Filter_validate_int	Validates the value with an integer in the specified range.
Filter_validate_boolean	Returns True if "1", "true", "on" and "Yes", and returns False if it is "0", "false", "off", "No", and "". Otherwise, NULL is returned.
Filter_validate_float	Validates the value with a floating-point number.
Filter_validate_regexp	Based on RegExp, Perl-compatible regular expressions are validated for values.
Filter_validate_url	Verify the value as a URL.
Filter_validate_email	Verify the value as an e-mail.
Filter_validate_ip	Verify the value as an IP address.

PHP's own filter filtering function