PHP comes with verification mailbox URL IP function

The previous use of PHP to verify that the mailbox, URL, IP is legitimate through their own write regular to achieve, but sometimes the brain faint, may write a not exactly the correct regular, leading to validation errors, today found that PHP itself with the verification mailbox, URL, IP is legitimate function.

The main use is the Filter_var function.

Grammar

filter_var(variable, filter, options)

Parameter description

Variable required. Specifies the variables to filter.

Filter is optional. Specifies the ID of the filter to be used.

The options rule contains an array of flags/options. Check the possible flags and options for each filter.

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 "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.

Example #1 A Filter_var () Example

?

1234	<?phpvar_dump(filter_var(‘[email protected]‘, FILTER_VALIDATE_EMAIL));var_dump(filter_var(‘http://example.com‘, FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED));?>

The above routines will output:

?

12	string(15) "[email protected]"bool(false)

The above is a small series to introduce you to the PHP self-contained method to verify the mailbox, URL, IP is legitimate function, I hope that we have some help, if you have any questions please give me a message, small series will promptly reply to you. Thank you very much for the support of the Scripting House website!

Original link: http://blog.csdn.net/veloi/article/details/53520995

PHP comes with verification mailbox URL IP function