PHP Filter function

Source: Internet
Author: User
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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.
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