PHP's own method to verify the mailbox, URL, IP is legitimate function _php skills

Before using PHP to verify the mailbox, URL, IP is the legal is written by their own to achieve, but sometimes the brain is faint, may write a not completely correct regular, leading to validation errors, today found that the original PHP itself with the verification of mailboxes, URLs, IP is legitimate functions.

The main use is the Filter_var function.

Grammar

filter_var(variable, filter, options)

Parameter description

Variable required. Specify the variables to filter.

Filter can be selected. Specify the ID of the filter to use.

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	Call user-defined functions to filter 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 to remove or encode special characters.
Filter_sanitize_special_chars	HTML escape character ' "<>& and 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	No filtering, removal or encoding of special characters.
Filter_validate_int	Validates a value in a specified range with an integer.
Filter_validate_boolean	Returns true if "1″", "true", "on" and "Yes", or False if "0″", "false", "off", "No", and "". Otherwise NULL is returned.
Filter_validate_float	Validates values with floating-point numbers.
Filter_validate_regexp	According to RegExp, the Perl-compatible regular expression validates the value.
Filter_validate_url	Validates 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

<?php
var_dump (Filter_var (' bob@example.com ', filter_validate_email));
Var_dump (Filter_var (' http://example.com ', Filter_validate_url, filter_flag_path_required));
? >

The above routines will output:

String "bob@example.com"
bool (FALSE)

The above is a small set of PHP to introduce a method to verify the mailbox, URL, IP is the legal function, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!