PHP comes with verification mailbox URL IP function

Source: Internet
Author: User
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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

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