PHP Filter_var () function _php Tutorial

Introduction to PHP Tutorial Filter

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

Installation

The filter function is part of the PHP core. These functions can be used without installation.

PHP Filter function

php: Indicates the earliest version of PHP that supports this function.

function	Description	PHP
Filter_has_var ()	Checks whether a variable of the specified input type exists.	5
FILTER_ID ()	Returns the ID number of the specified filter.	5
Filter_input ()	Get input from outside the script and filter it.	5
Filter_input_array ()	Get multiple inputs from outside the script and filter them.	5
Filter_list ()	Returns an array that contains all the supported filters.	5
Filter_var_array ()	Gets a multi-item variable and filters it.	5
Filter_var ()	Gets a variable and filters it.	5

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!#$%& ' *+-/=?^_ ' {|} ~@. []
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.

http://www.bkjia.com/PHPjc/445380.html www.bkjia.com true http://www.bkjia.com/PHPjc/445380.html techarticle PHP Tutorial Filter Introduction PHP filters are used to validate and filter data from non-secure sources, such as user input. Installing the filter function is part of the PHP core. No need to ...

